Cross Contamination

Gluten-Free Communion Guide

The purpose of this guide is to give you the necessary tools to safely make, prepare, and distribute gluten-free hosts to your gluten-free members.

Attention to detail is critical for success in the gluten-free lifestyle. It is not surprising considering lives are turned upside-down by something measured in parts per million [yes, parts per million].

Please keep an open mind about the information presented here. It can be hard to comprehend that "The Staff of Life" can make someone sick. Science proves it to be true for about 3 million with celiac disease and an estimated 17 million with gluten sensitivities; just in the USA alone.

In this guide, you'll find information on gluten, how to eliminate gluten cross-contact, several recipes for gluten-free hosts, and links to commercially available gluten-free hosts.

If you have questions or desire additional help in instituting a gluten-free communion in your house of worship, please reach out to us.

Alan & Peggy Klapperich
Gluten Intolerance Group of East Central Wisconsin
Phone: 920-748-4877

If you are looking for just the recipe: click here.

Links to Download GF Communion Guide PDF



04/11/21 - Updated Guide to Gluten Cross Contact Guide
3/21/19 - Updated for 2019 Synod Assembly

Guide to Gluten Cross-Contact


Basic kitchen safety rules tell us that we need to separate ready-to-eat foods from raw meats, poultry, seafood, and eggs - and to use separate cutting boards and utensils to reduce the risk of food poisoning.

The same rules apply to gluten and gluten-free foods - they must be kept apart.

Even though a recipe may use gluten-free ingredients, the food must be appropriately prepared, so it remains gluten-free. If you are making meals for a gluten-free guest, you must be mindful of gluten cross-contact.

This guide will help you to understand and prevent gluten cross-contact.

Cross-Contact and Cross-Contamination
Aren’t they the same thing?

We often use the term “gluten cross-contamination” when speaking with foodservice professionals about the preparation and handling of our gluten-free foods.

Cross-contact and cross-contamination appear to mean the same thing, but there is a subtle difference according to the FDA. Cross-contamination is a commonly used term for allergens. However,
allergenic proteins are a normal component of food and not considered a contaminant. Based upon this definition, the agency began differentiating the conditions two years after the Food Safety Modernization Act (FSMA) of 2011 became law.

Let's explore the differences a bit more.

Cross-contamination happens when
biological contaminates (bacteria or viruses) transfer from one food (or surface) to another.

Example: using the same cutting board & utensils for raw meats and ready to eat ingredients). Killing bacteria by heating the food to a recommended temperature makes the food safe to eat. Of course, we know this is not possible for gluten (or any allergenic proteins), however using improper terminology will give the wrong impression to a foodservice professional.

Cross-contact happens when
allergenic proteins transfer from one food (or surface) to another.

Example: using the same cutting board to cut gluten and gluten-free bread. While we expect our food to be biologically contaminate-free, cross-contact is what we're concerned about with gluten.

Using the appropriate terminology with foodservice professionals will clearly and accurately describe our needs.

"Avoiding Cross-Contact"
Food Allergy Research & Education (FARE).

Updated: April 1, 2021

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The Basics

Before you start you need to know a few basics.

What is gluten?

Gluten is the generic term for the proteins found in grains. The proteins found in wheat, barley, rye and commercial/mainstream oats (think Quaker Oats) are not acceptable for those following a gluten-free diet. Commercial or mainstream oats contain gluten due to how they're grown, harvested, transported and processed. Certified gluten-free oats are acceptable for some celiacs.

Where is gluten found?

Just about everywhere! Bread, pizza, cake, cookies, crackers, pasta, cereal, soups, sauces, beer - just to name a few foods. Many processed foods contain gluten in some form or another. It's very prevalent in the Standard American Diet.

What does gluten do?

Gluten provides the structure, the framework – it holds everything together. It gives that chewy texture that is desirable in many foods like bread & pizzas. It also makes a lot of people sick.

How much?

How much arsenic would you like in your food? Very good, I thought you'd say zero.

Not only must the food be gluten-free, but it also must not come in contact with any gluten.

The concept of
“a crumb will hurt you” is hard for people to understand because it involves minuscule amounts.

How small? A multicenter, double-blind, placebo-controlled, randomized study has shown that up to 10 milligrams of gluten per day is considered to be safe amount. Yes, per DAY. (10mg = 1/8th of a teaspoon of flour, or 18 slices of gluten-free bread). Yes, crumbs matter!

What does 10mg of gluten look like?

Tricia Thompson, MS, RD of Gluten-Free Watchdog answers this question.

She breaks it all down for us starting with a one ounce (3,515 mg) slice of gluten bread.

Special thanks to Tricia for allowing me to use her pictures to draw this diagram to show the relative size.

Mind blown? There's more...

Many cannot consume even 10 mg of gluten without getting sick.

Where to find it and what to do about it

  • Condiments (spreadable) – jars of peanut butter, mayo, butter, margarine, jelly, etc. These containers are large gluten magnets due to "Double Dipping."

  • Purchase and use new products. Dispose of contaminated products or clearly label as not gluten-free.

    Double dipping is strictly prohibited. Master the fine art of “Gob Dropping” or using a couple of spoons & knives to accomplish the task.

    Purchase squeezable containers when possible.

  • Any foods like flours, starches, white or brown sugars, etc. that frequently use shared utensils with gluten.

  • Do not re-use a measuring cup after it contains gluten flour/ingredient. Thoroughly wash it, or use a clean one.

    Same goes for stirring and serving. Always use a clean utensil for gluten-free foods.

    Have dedicated utensils for only GF use.

    Purchase and use new products. Dispose of contaminated products or clearly label as not gluten-free.

  • Brown sugar has another risk factor. Some people will put a piece of bread in their container to keep the sugar soft. Breadcrumbs contaminate the sugar.

  • Purchase and use new products. Dispose of contaminated products or clearly label as not gluten-free.

  • Deep fry oil or pasta water.

  • Do not deep fry gluten-free foods in oil that previously fried gluten-full foods. Use fresh oil, or fry GF foods in fresh oil before frying gluten-full foods.

    Do not boil gluten-free pasta in water that previously cooked gluten-full pasta. Use fresh water for GF pasta.

  • Silverware drawers – take a look in there – lots of crumbs!

  • Clean out the entire drawer and re-wash the utensils. Do the same for any other drawers too.

  • Kitchen surfaces – whenever preparing gluten-free food, make sure work areas, and hands are clean and free of crumbs.

  • Dry wipe the crumbs first with a paper towel. Use hot soapy water to wash then rinse with fresh, clean water. Bleach will not do anything to gluten to make it safe.

    It's best to designate a gluten-zero prep area where no gluten is allowed.

  • Toasters - if you’ve ever toasted gluten products in it, there is no way to clean it effectively.

  • Do not use a toaster that has contained gluten. Purchase a new one.

    Toaster bags are an option.

    Toaster Ovens with Fixed racks – line with foil. Works well for heating, baking, but not good for toasting.

    Toaster Ovens with Removable racks – purchase and mark new rack for GF use. Foil existing rack or clean.

  • Ovens and Convection Ovens (they circulate the air inside the oven to shorten cooking times).

  • If you can not bake gluten-free items separately from gluten items, always place gluten-free items on the top rack - above gluten items.

    Either turn off the convection feature (circulated air) or make sure you have a tight-fitting lid on your gluten-free dish.

  • Cake pans – these pans typically have a lot of very deep cuts/grooves in them.

  • Purchase new or use disposable aluminum cake pans. Gluten can get stuck in deep cuts.

  • Cookie sheets

  • Line with parchment paper when baking GF cookies.

    Have dedicated GF cookie sheets.

  • Any utensil, pot, pan, dish, etc. that has come in contact with gluten. They must be clean before gluten-free use.

  • Do not reuse these items for gluten-free foods without thoroughly washing them or grabbing a clean one. For example: Don't use the gluten pasta salad spoon to serve the gluten-free pasta salad.

    Those living in a mixed house should have dedicated gluten-free utensils, cutting boards, colanders, etc. It helps to have them color coded. Consider using the color red for gluten-free.

  • Colanders/Strainers/Flour Sifters – Pasta/gluten often get stuck in the small little holes and slits, thoroughly cleaning them is a nightmare; if not impossible.

  • Wooden utensils/boards/rolling pins – Porous items can harbor gluten.

  • Cutting boards [plastic or wood] – due to the deep cuts and grooves, it’s best to get a new one.

  • Purchase new colanders, flour sifters, wooden items, cutting boards.

  • Non-stick pots & pans

  • Replace if there are any cuts or scratches on the surface, do not use it, gluten can get caught. As long as it can be well cleaned, it should not be a problem.

  • Cast iron skillets – the “seasoning” develops from years of use.

  • Replace. Some people re-seasoned their old skillets by heating them to 600-700 degrees for 30 minutes to burn off any residue.

  • Ceramic bake or cookware (Pizza Stone) – it's porous..

  • Foil it or purchase new. Cleaning porous items is difficult.

  • Dishtowels/sponges/dishrags

  • Use paper towels to make the first pass on clean up. Then use clean/unused items to finish cleaning.

    Due to the holes in sponges, dedicate one to gluten-free.

    Change them often.

  • Grill grates

  • Cleaning them may be a messy job. It might be time to replace the grates.

    If cleaning or replacing isn’t an option - grill gluten-free items on aluminum foil.

  • Shared bowls or bags of your favorite GF snack food. Shared dips & sauces. They are crumb magnets.

  • Snacks must be poured out into an individual bowl before any cross-contact.

    Have a marked & dedicated gluten-free chip dip bowl.

  • Family-style or Buffet-style service - A gluten-free nightmare! Inevitably someone will grab a spoon from the pasta salad bowl for the gluten-free coleslaw.

  • If 100% gluten-free buffet-style isn’t possible, separate gluten-free foods from the gluten-full foods. Color-coded containers & utensils help lessen the cross-contact risks. Have a “Gluten-Free” sign posted.

    If no room for separate gluten-free/gluten-full foods, hold back some of the gluten-free foods before they are placed out for service. Tell your gluten-free guest where to find these items.

    Invite gluten-free guests to go through the line first - before any of the gluten-free dishes have a chance to get contaminated.

  • TV Remotes, Phones, Keyboards, Mice...anything that has been touched by glutened hands.

  • If you have touched gluten - wash your hands before touching anything else.

    Clean these items the best you possibly can - it is tough.

  • More Cross-Contact Information

  • “The Tools to Replace in Your Gluten-Free Kitchen”
    Gluten Intolerance Group of North America (PDF)

    “Producing Gluten-Free Products in a Non-dedicated Kitchen”
    Gluten Intolerance Group of North America (PDF)

    “7 Tips for Avoiding Gluten Cross-Contact at Home”
    Gluten Intolerance Group of North America (PDF)

    “Preventing Cross-Contact at Home” - Academy of Nutrition and Dietetics

    “A Day in the Life: Living in a Mixed House”
    Gluten Intolerance Group of East Central Wisconsin

    “Gluten-Free Diet Boot Camp”
    Gluten Intolerance Group of East Central Wisconsin

    “Educating Family and Friends about Gluten-Free”
    Gluten Intolerance Group of East Central Wisconsin

    “Tips to Prevent Gluten Cross-Contamination” by By Lisa Cantkier
    Published May 24, 2021

Can you destroy gluten by heat?

A study appearing at the International Celiac Symposium 2017 India, shows it's quite difficult to destroy gluten with temperatures used in customary cooking methods. And when it is destroyed [requires temperatures in excess of 392F for extended period of time], it's not safe to eat [not that gluten is safe to eat in its un-carbonized state...]

Read more:

Gluten-Free Foods and Shared Fryers


On September 14th, 2020, Gluten-Free Watchdog presented their first-of-kind study to the Association of Official Analytical Collaboration (AOAC) International. This study measured the amounts of gluten found in gluten-free foods when cooked in fryers that previously fried gluten-containing foods.

Like the study above, Gluten-Free Watchdog shows that gluten cross contact in shared fryers is problematic for individuals with gluten-related disorders.

“Gluten-free foods cooked in shared fryers with wheat: A pilot study assessing gluten cross contact.”


Dietitians have long been discouraging consumers with celiac disease (CD) from ordering gluten-free foods cooked in shared fryers at restaurants.

This recommendation is based on presumed gluten exposure versus evidence-based research that gluten cross contact occurs. To the best of the authors’ knowledge there is no published data on gluten levels of gluten-free foods after cooking in shared fryers.

The lack of evidence of cross contact contributes to confusion among consumers, especially when gluten-free foods cooked in shared fryers (e.g., fries) are marked as gluten-free on some restaurant menus.

The purpose of the present study is to help inform consumer recommendations by assessing gluten levels of fries free of gluten-containing ingredients cooked in shared fryers with wheat.


The sandwich R5 ELISA found quantifiable levels of gluten in 9 of 20 (45%) orders of fries ranging from 7 to > 84 parts per million (ppm)(above the highest standard) (Table 1).

Five orders (25%) of fries tested above 20 ppm of gluten.

Fries from 6 of the 10 (60%) restaurants were found to contain quantifiable levels of gluten in at least 1 of the 2 orders, with fries from 4 of these 6 restaurants found to contain levels above 20 ppm of gluten in at least 1 of the 2 orders.

The competitive R5 ELISA found gluten in 3 of the 20 (15%) orders of fries ranging from 14 to > 283 ppm gluten (above the highest standard).


Results of this assessment suggest that gluten cross contact may occur when gluten free foods are cooked in shared fryers with wheat. While a much larger study may be warranted, it remains prudent to advise consumers with CD to avoid foods cooked in shared fryers.

It is impossible for a consumer to know how much gluten is in fryer oil and how much gluten may end up in an order of fries. Shared holding trays, scoops, and fryer baskets also are sources of potential cross contact.

The gluten levels reported in this investigation are likely underestimates due to the limitations of the analytical methods available for gluten analysis of foods heated to high temperatures

For more information (including PowerPoint presentation, video, and white paper):

Frontiers in Nutrition - March 23rd, 2021:
Authors: Tricia Thompson, MS, RD, Trisha B. Lyons, RDN, LD, Amy Keller, MS, RD, LD, Nancee Jaffe, MS, RDN, and Luke Emerson-Mason, MS.

Additional Hints & Tips

Store gluten-free foods on the top shelf of pantry or fridge. Gluten will not fall into gluten-free food.

Store GF items in well marked, sealed containers.

Do not purchase food from bulk food bins. Highly contaminated.

Purchase only GF Certified grains & flours. Including oats - no commercial oats (think Quaker Oats).

Flour particles can remain airborne for up to 24 hours. Only prepare gluten-free foods after a thorough cleaning and before gluten foods.


The Amount of Accidental Gluten Consumption

A group of researchers from Immunogenx and Biomedal/Glutenostics recently published the results of their study - quantifying the amount of gluten being consumed by a selected group of patients with celiac disease. Indeed this was a first-of-its-kind, ground-breaking study. [See below for link to the actual study]

What did the study find?

People with celiac disease are inadvertently consuming more gluten than they realized.

Keep in mind, medical experts recommend gluten consumption be kept below 10 mg per day.

Participants were (on average) consuming between 15 and 40 times the recommended limit. 244 mg is approx. 8.5 grains of rice.

While these numbers might explain why an estimated 30% to 70% of celiac patients still experience celiac-related symptoms while following a gluten-free diet, it raises many more questions.

How much gluten is coming from cross-contact?

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06/03/21 - Add Gluten-Free Living article to web
04/01/21 - Add GIG Tools to Replace & 7 Tips to Avoiding CC at Home links
10/2/20 - Add link.
09/27/20 - Add Gluten-Free Watchdog’s French Fry Study
10/23/19 - Add Gluten-Free Watchdog
“What Does 10mg of Gluten Look Like?” link and update links
01/13/19 - Add GIG’s Cross-Contamination PDF
05/02/18 - Add Accidental Gluten Consumption Study & grammar clean up
01/28/18 - Added Gluten and the destruction by heat info
04/22/17 - Removed bad link.
04/29/15 - Added "A Day in the Life: Living in a Mixed House".
04/22/15 - Updated GIG links and updated Printer Friendly version.
01/31/15 - Added Cross Contamination page link
06/21/14 - Add convection oven
12/27/13 - Fix broken links
10/20/2013 - Clarify terminology

Quarter Image by OpenClipart-Vectors from Pixabay

A Day in the Life: Living in a Mixed House

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This article was originally written and presented to the members of this support group in March 2009. I decided to correct some typographic errors and add some additional knowledge/information I didn't have when I originally wrote it.

This document draws upon my knowledge and experience I have acquired since going gluten-free in 2003. I have given you, the reader, a glimpse into how I personally carry out a gluten-free diet in a mixed house. I am not suggesting this is the only way or the best way; it's simply my way. Nothing more – nothing less. Please do not take any information found here as medical or professional advice. I'm not a doctor/nutritionist/dietitian, nor do I play one on TV. Before making any changes, discuss them with your healthcare team to make sure they are right for you.

My only intent is help others that may be struggling with the gluten-free lifestyle.

Alan Klapperich
GIG of East Central WI - Branch Manager

Updated 6/24/2014

Not only do we have to be concerned about gluten ingredients that make up our food – we also have to be concerned about any gluten that may come into contact with our gluten free food.

Often times those that are new to the diet [or our friends and loved ones that don’t yet understand the diet], don’t fully understand the lengths we have to go thru to make sure our food isn’t contaminated. Yes, eye rolls and sighs are often the reactions we get. They think we’re being over cautious, anal retentive, drama queens…running around like Lucy van Pelt in A Charlie Brown Christmas “Ugh! I've been kissed by a dog! I have dog germs! Get hot water! Get some disinfectant! Get some Iodine!”

Gluten is gluten – it doesn’t matter how we come in contact with it. We need to be mindful of it.

GF or NGF [Non-Gluten-Free] Household – That is the question

Choosing what type of house to have depends on many factors. Economic, young children, percentage of members that require GF – just to name a few. I’m not going to defend or promote one way or the other. Every one must make the choice that fits them best. There’s no question that having a totally GF house would make things a lot easier on those that need to be GF. You have to weigh the practicalities of each side very carefully. However, as we continue down this gluten-free path, our house contains an ever dwindling supply of gluten. If we had kids, we might have chosen to be a 100% GF house right away.

Obviously those people that have a GF household are going to have an easier time of this. I’d venture to guess that, most people have a mixed house. I suspect that most celiac homes are mixed [meaning those that must be GF are, those that aren’t GF have gluten foods in the house]. I took a poll on one of the discussion boards I administrate. 77% (24) live in mixed houses.

I will say this – if you are having trouble getting your numbers down on your annual follow up blood work or still don’t feel well – you’d need to examine what is going on. How is gluten getting in? Are your food choices correct? Are you eating processed/packaged foods? Are you dining out? Could it be cross contamination at home? Did you check your meds/supplements? A number of things must be considered.

Those of us with a mixed house have our work cut out for us. We must always be on guard and always observant. Some people see this as a negative, because they don’t have a safe harbor from the rest of the gluten polluted world – that is completely understandable and desirable in certain circumstances. In my case, I don’t view it as a hardship, I view it as one of those “facts of life”. I feel it prepares me to deal with the rest of the world that doesn’t cater to me and my needs. Once you figure out a system, sharing a kitchen/pantry is do able – it just takes some planning – just like everything else with the GF lifestyle. “He who fails to plan, plans to fail”.

A very key element in having a mixed kitchen or 100% GF house – is having total buy-in of rule following from the others that live in the house. You’re really at their mercy in this. Sometimes this is not always easy – particularly with uncooperative spouses/significant others, kids [young ones] or yes, slobs. I’ve always said, it’s a good thing that I’m the one that’s GF, and not Peg. Yeah, truth be told, I can be teeny-tiny bit of a slob. In my defense, [I think Peg will back me up] when it comes to keeping the kitchen clean of food droppings, I think I do a pretty good job. I do my best to follow all the cross contamination rules just as she does. The kids – well – kids will be kids. As good as they can be, there’s going to be some mistakes made. The older kids, it might be easier to teach them what they need to do to keep things safe for their GF family member.

Regardless if you’re a mixed house or a 100% GF house, it’s always a good idea to give the kitchen/pantry a thorough cleaning when first starting out. Pull everything out of the fridge, cupboards, cabinets and drawers. Wash things down with warm soapy water – changing the water frequently. Gluten is not a living thing, so you can’t kill it – bleach does nothing. Heck as long as you’re at it, pull out the stove and fridge too - they can get pretty funky! For those with a mixed house – you’ll have to do this regularly if you don’t already do it.


As long as you have all the stuff pulled out of the cupboards and shelves, you will want to look at reorganizing them. You’ll want to have designated shelves, drawers and cupboards strictly for GF foods and for NGF foods. It’s best to keep the NGF items away from the GF items. It can also help to get some sealable containers so that you can place the GF food inside them – that way you won’t have to worry if something gets spilled or dropped on it. If you happen to have NGF flours – putting them in their own sealable container is also advisable. If you share pantry space, put GF items ABOVE gluten items. Since gluten rolls downhill, we don’t have to worry about “stuff” falling into it our GF foods. Also, make sure you clearly label GF and or NGF containers as such.

Also try to designate some counter or prep space strictly for GF items. Try to make a GF zone so that you always know you have a clean space to put things down. This can help a great deal when prepping meals.


There are some utensils that you’ll want to replace – hands down, no matter what.

Toasters - if you’ve ever toasted glutened products in it – get yourself a new one and mark it so everyone knows that only GF items are to be put in it.

Toaster Ovens – if you’ve got one with removable racks, call the manufacturer and see if you can purchase another rack for it. We purchased a Kitchen Aid, as soon as I got home I called them and asked about another rack. The representative seemed somewhat perplexed as to why I wanted another rack. I explained – he sent me another one free of charge! Now that’s customer service!

Colanders/Strainers/Flour Sifters – Since pastas/gluten often get stuck in the small little holes and slits, cleaning them fully is a nightmare if not impossible. We have 2 colanders.

Wooden utensils/boards/rolling pins – Porous item can harbor gluten.

Cutting boards [plastic or wood] – due to the deep cuts and grooves, it’s best to get a new one.

Cake pans – these pans typically have a lot of very deep cuts/grooves in them. Cookie sheets – you could always use parchment paper with your existing pans when baking GF cookies. I have my own cake pan, muffin tins, pizza pan, mini loaf pans, cookie sheets.

Non-stick pots & pans – if there’s any cuts or scratches in the surface, replace it. It’s reported that Teflon is a porous surface and thus is not GF friendly. I have relaxed my views on non stick surfaces over time. As long as the coating does not have any cuts/scrapes/grooves – and as long as it’s completely clean – it's not a problem. I sent off an email to Tricia Thompson aka The Gluten Free Dietitian aka the author of The GF Nutrition Guide. Since she’s done many scientific studies, I thought she’d be a good one to ask about Teflon. Here’s what she said:

"In my opinion, if a teflon pan has scratched and starts to peel it should be thrown away for reasons far more important (probably) than the possibility it harbors gluten. Maybe it's just me but I don't like the idea of eating those little bits of teflon even if they are chemically inert!!

 As for the possibility that nonstick pans absorb gluten, I am not aware of any studies but find this hard to imagine. I am not an expert on Teflon but based on what I've read, Teflon is chemically inert, is not porous, and does not absorb food. "

~ Tricia Thompson, RD

There are only 1 or 2 pans that we use for gluten foods – I use them if I have to [which is rare].

Cast iron skillets – the “seasoning” develops from years of use is definitely something to stay away from. I’ve heard of some people getting them sandblasted or scrubbing them with steel wool and starting over.

Ceramic bake or cookware – yeah, that old pizza stone ain’t gonna cut it. Foil it, or hand it down to the gluten eaters.

Having some type of marking scheme is important. People have to know what’s used for GF and fair game for anything else. In our house we use the color red as much as possible for GF items. Spatulas, spoons, Tupperware, etc – all have the color red somewhere. We do have a GF wooden spatula – it’s Pampered Chef Brand – it’s the only one of it’s kind. For our toaster oven rack, I’ve colored all 4 corners red with a Sharpie permanent marker.

We have even trained frequent guests and family members on how our house functions and cross-contamination concerns.


Figuring out how to navigate in this gluten filled world takes some doing. It requires a GPS – Gluten Position Service. Figuring out how to do it in your own kitchen is no exception.

Areas of concern

I’ve already discussed the utensils.

Counters – crumbs from making a NGF sandwich can be scattered and left behind. This is why it helps to have designated areas for GF and NGF. It just makes things a bit easier.

Dishtowels/sponges/dishrags – it helps to use paper towels because they’re disposable. If Peg is working with NGF products, she’ll clean first with paper towels then use a dishrag. After cleaning up she will switch out the dishrags with fresh ones. An average day in our house does not really generate much gluten usage.

Pets & Pet food – this is an easy one to overlook. If you’re feeding Rover NGF dog food, you might consider switching to a GF dog food [yes, pets do benefit from GF diets too!], or be very careful to wash your hands after feeding them. I have a friend that saw her testing numbers get worse – she finally pinned it down to bags of bird seed. That particular brand of bird seed contained wheat and she kept breathing in the dust [and swallowing it] when she was feeding the birds.

Kisses from loved ones – while this may sound strange, crumbs and residue can remain on hands/faces/mouths of loved ones for hours.

Microwave – how often do you put something in there and as foods heat up, things splatter around? These guys can be a real harbor for gluten pollution.

Grill grates – it might be time to replace the grates on the old weber. Of course you could try cleaning them, but sometimes that’s a nasty job in itself! If cleaning or replacing the grills are not an option – grill your GF items on tinfoil.

Hair/skin care products – if you happen to touch your hair, it’s possible for hairspray, etc to get on your hands and thus on your food or into your mouth. Most experts will say that topical connect from gluten will not cause a celiac reaction – it must be ingested in order for it cause problems. However, I know many people that do experience some type of skin reaction when they touch it. Is this a true celiac reaction or some other type of reaction – not really sure. This is a highly debated topic. Bottom line, if you react in any way – make sure the product is GF. Problem solved! For more information on GF cosmetics/hair care products, please check out:

Condiments (spreadable) – jars of peanut butter, mayo, butter, margarine, jelly, etc. These guys are huge cross-contamination magnets! Double dipping is strictly prohibited and a punishable offence! You’ll need to train people on the fine art of Gob Dropping or using a couple of spoons/knives to accomplish their task. Of course some of these products can be gotten in squeezable containers – this can help. If you think you can double dip just because you’re using GF products – think again… First of all, you won’t be able to tell if those crumbs are GF or NGF. Second of all, crumbs of any kind in those places are not good eats! GACK!

Shared bowls/bags of your favorite GF snack food - Think about when someone makes a monster sized NGF Dagwood sandwich, then they dig their gluteny paws into the potato chip bowl/bag. Bags of snacks must be poured out into an individual bowl.

Telephone/Keyboard/Mouse/TV Remote – yup these can get glutened too.

For a more detailed look at gluten cross contamination, please see our Guide to Gluten Cross Contamination.

A Day in the Life

Getting the hang of safely surviving in a mixed house will take some time. Let’s face it, you’ve probably lived NGF for a lot longer than GF. Old habits and actions take time retrain and rewire. You will make some mistakes starting out, count on that. I know, people are going to say “if you had GF house you wouldn’t have to worry about mistakes…”. Yeah, well, if you stay in bed, you don’t have to worry about getting hit by a car either. This is life, life isn’t perfect, so we do the best we can with the situation we have. After awhile you become conditioned – for better or worse. We were making lunch one day, Peg had her NGF bread on her plate already and she asked me to lay some sandwich meat on her bread since her hands were contaminated at that point. I pulled out a few pieces and I was starting and stopping with jerky movements. Peg thought I was messing around and asked what I was doing. I told her I was having trouble putting the meat on her NGF bread. I had become so conditioned to NOT do it, I had trouble doing it even when it was acceptable to do.

Spaghetti - Take cooking spaghetti for example…how do you test it to see if it’s done? No, throwing it on the wall to see if it sticks is not an option – at least in our house. Right – you taste it. We’ll that’s not possible if you’re cooking NGF pasta – however, old habits are hard to break! I know I’m not the only one that has put NGF pasta in my mouth to see if it was done then realized in horror what just happened. This was years ago, and I have since retrained myself not to do that. Now if I’m cooking pasta for Peg, I will do it by feel. Pinch it between my fingers – then have Peg taste it. Yes, I wash my hands after testing it.

I can hear you asking – “How do you keep straight which utensil to use?” It’s fairly easy actually. Since I’m left handed, I will put my GF pasta pot [yes I have my own pasta pot] on the left side of the stove. I will put Peg’s NGF pasta pot on the right side of the stove. I keep each utensil on the corresponding side. Also remember that my utensils are colored red – this helps in keeping things straight.

I can hear another question - “How do you stop gluten water from bubbling/splashing over into yours?” I stagger the time that I put in the GF and the NGF pasta. I’ll do mine first so it gets done first and thus drained first [into my GF colander]. If I have both going at the same time, I watch the heat to make sure it’s not splashing over the sides of the pot and I’m careful when I stir.

The pasta sauce is GF. Peg can add any NGF modifiers to her plate if she chooses.

This is pretty much how all of our meals are…the base of the meal is GF…then Peg can add whatever she wants. Most times it’s nothing NGF. Pastas, breads, pizzas, cereals/breakfast bars and some desserts – are about our only separate food items.

Baking – As I mentioned I have my own GF baking pans/tray/mixing paddles and mixing bowl [the bowl is stainless so it’s not a big deal anyway]. Peg still does some NGF baking [for fun and some profit]. Around the holidays it’s not uncommon for her to bake me some goodies then bake NGF goodies for herself or an order. Always, always always, the GF items are baked first. After she’s done with the GF baking, she’ll do the NGF baking – using the NGF equipment. It’s been reported that flour poofs around and and stays in the air for up to 24 hrs. Peg maintains that if you’re careful, you can keep the flour poofing to a minimum. She also maintains that GF flour poofs worse than NGF flour. Most generally I am not around when Peg has the NGF flour out, but I happened to watch her one time when she was scooping out the flour and mixing it – I did not see clouds of flour anywhere. The mixer is turned on slowly so flour is not spewed out all over. It would be interesting to do this under a black light to see if we could see it.

As an [unscientific] experiment, I placed several pieces of dark blue paper [sorry, no black was handy] around the kitchen before Peg started her non-gluten-free baking. No mixer was used in this experiment – all mixing was done by hand. Two pieces were sitting between 6” and 2 feet from the measuring/mixing/rollout area. The remaining piece was sitting about 2 feet away on the stove. The 2 pieces closest to the measuring/mixing/rollout area had a few small specks of non-gluten-free flour. The paper sitting on the stove, had no visible flour on it. I will say, that I have never seen or felt a coating of dust/flour after GF or NGF baking.

When NGF baking she clears off the counter so if flour does happen to poof around, it won’t settle on anything…other than the counter. When she’s done the counter is thoroughly cleaned and counter items put back after cleaning.

Hosting Family Events

In some cases family events tend to buffet type setups. Should this be the case, arrange all the gluten foods last in the line and away from the GF foods. It also helps explain to guests what foods are what and not mix the utensils. If you have things like BBQ’s [aka Sloppy Joes] or things that guests might have to build themselves – have 2 separate stations/containers for these -this way you can keep yours [the lion’s share] safe. It’s always smart to have smaller portions at the NGF station. Once it contaminated – you’re not going to want it – unless someone else in the house can eat it. Should you run out or low of the fixin’s at the NGF station you can always refill it from the GF container.

Another tip is to be the first thru the line so you know there’s been no cross contamination. There’s gotta be some perks to this GF thing, right?

Outside your Kitchen

Cross-contamination also occurs outside your kitchen too. We’ve already discussed the cross-contamination issues and dining out. It also applies to our food and how it’s processed and packaged at the manufacturer. You’ve probably all seen the “Processed in the same facility that process wheat, peanuts, cat hair, whale blubber…”

According to Cynthia Kupper, RD [Director of Gluten Intolerance Group of North America] in her talk at HealthNow's Gluten Sensitivity/Celiac Forum 2010, the “Processed in..” and “Processed on...” statements are voluntary advisory statements designed for those with IgE [anaphylactic reaction] allergies. Many companies use the statements to “cover their backsides” legally. In reality they have no meaning for celiacs. She stated a group of registered dietitians knowledgeable in celiac/gluten-free; determined it would be reckless of them to suggest that the voluntary statements be used solely to determine the gluten-free status. If you have a true IgE reaction, you need to heed the warning. I highly recommend buying and watching HealthNow's 2010 Gluten Forum DVD. Well worth the $15.00.

Some companies are better than others when it comes to processing our foods. According to a 2005 report from the Inst.of Food Technologists - nearly all companies do follow “good manufacturing practices” [except for the Peanut Corp. of America], which the IFT concluded to be “effective in reducing or eliminating cross contamination”. While many processes take multiple steps to protect consumers, some don’t take any. ACK!!

FDA studies conducted from 1999 – 2005 revealed*:

About 55% of food processors identified and separated ingredients with allergens as raw materials.

About 80% took one or more steps to keep food processing equipment clean and prevent allergens from spreading to otherwise allergen-free foods. This includes: dedicated machinery, cleaning shared machinery between runs. Clean was the most common.

The most common source of cross-contamination comes from the build up of food residue on equipment even after it has been cleaned.

About 25% of the facilities were still likely to have allergen contamination in foods they produce. FDA states this figure should not be used as a gauge of overall cross-contamination in processed foods since these inspections were not chosen at random – they targeted facilities where the possibility of cross-contamination was the greatest.

Some companies when they first switch from an NGF run to a GF run [after the cleanup process was done] will donate a certain percentage of the product from the first run to a non-allergic organization in an effort to reduce the cross-contamination risk.

*The source of this information was obtained from: Department of Health and Human Services, Food and Drug Administration, Center for Food Safety and Applied Nutrition, Food Allergen Labeling and Consumer Protection Act of 2004, Public law 108-282, Report to the Committee on Health, Education, Labor, and Pensions, United States Senate and The Committee on Energy and Commerce, United States House of Representatives, July 2006. The original PDF located at: could no longer be found.


  • Choosing a 100% or mixed house based on many factors. It’s a personal choice, do what’s best for your situation.

  • Large percentage of homes are mixed.

  • To be successful, total buy-in from other household member to follow all the GF rules.

  • Pull out everything and clean thoroughly everywhere with warm soapy water.

  • Organize kitchen & pantry. Separate GF and NGF as much as possible.

  • GF items are stored ABOVE NGF items.

  • Store items in sealable containers. Label them GF or NGF.

  • Have a GF zone somewhere in your kitchen.

  • Replace: Toasters, Colanders/strainers/sifters, anything wooden, cutting boards, cake pans, scratched nonstick pans, cast iron skillets, ceramic bakeware.

  • Labeling and marking of all items are important. Use colors to help remind.

  • Areas of concern: counter tops, dishtowels/sponges/dishrags, pet food, kisses, Microwave, grill grates, ceramic bake/cookware, skin/haircare products, spreadable condiments, shared bags/bowls of snacks, telephone/keyboard/mouse/remotes.

Resources and web sites used for this presentation:

What Is Gluten Cross-Contamination? And Why Should You Worry About It?
By Nancy Lapid ,

Hold The Gluten 10 - Avoiding Cross Contamination

Gluten Free Living – Spring 2007 Issue

Living GF for Dummies by Danna Korn

GIG’s Producing GF Products from a Non-Dedicated Kitchen

GIG’s Quick Start Diet Guide

Tricia Thompson’s – The Gluten-Free Nutrition Guide

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07/19/14 -
06/24/14 - Fixed broken links