You were tested. You were told you were fine. You are still not fine.
This is one of the most common stories in chronic illness, and for a small but real group of people there is a mechanical explanation for it that nobody mentions at the follow-up appointment.
The standard first-line blood test for celiac disease is called tTG-IgA. It looks for an antibody your immune system makes against an enzyme called tissue transglutaminase. In celiac disease your body attacks that enzyme, the antibody shows up in your blood, and the test finds it.
The antibody it looks for belongs to a class called IgA. And some people do not make IgA.
For those people, the test cannot find what it is looking for. It comes back negative. Not because they are healthy, but because the measuring instrument was pointed at something their body does not produce.
The short version
A celiac blood panel should include a total IgA measurement alongside the tTG-IgA. The total IgA is what tells the laboratory whether your result can be trusted. If your total IgA is low, the tTG-IgA result is meaningless and the laboratory is supposed to switch to different tests that do not depend on IgA.
This is not fringe. It is in the screening guidance from the Celiac Disease Foundation and the National Institute of Diabetes and Digestive and Kidney Diseases. It is standard practice at reference laboratories. It is also, routinely, not what happens when a busy clinic orders a single test to rule something out.
If you have already been tested
You do not need to relitigate your whole medical history. You need one piece of information off one lab report.
Ask whether a total IgA was run alongside your celiac panel. It may be listed as "IgA, serum," "total serum IgA," or "immunoglobulin A." If it is on the report and it is normal, your negative result means what you were told it means, and this page is not about you.
If it is not on the report, then your negative celiac test answered a narrower question than the one you were asking. That is worth raising with whoever ordered it.
The other false negative, and it is far more common
Celiac blood tests measure your immune reaction to gluten. If you have already stopped eating gluten, the reaction fades, the antibodies fall, and the test can read negative in someone who genuinely has the disease. People routinely go gluten-free because they feel better, get tested months later, are told they do not have celiac, and go back to eating it.
If testing is something you are considering, the sequence matters, and it is a conversation to have with your provider before changing what you eat rather than after. This page is not telling you to eat gluten or to stop. It is telling you that the order of operations changes what the test can tell you, and almost nobody is warned about that in advance.
What is actually happening in the body
Celiac disease is an autoimmune condition, meaning the immune system attacks the body's own tissue. The trigger is gluten, a protein found in wheat, barley and rye. The target is the lining of the small intestine.
The inside of your small intestine is covered in villi, microscopic finger-like projections that vastly increase the surface area available to absorb nutrients. Flattened out, that surface is enormous, and it is where iron, calcium, folate, B12 and fat-soluble vitamins are taken up. In celiac disease the immune response damages and eventually flattens those villi, a process called villous atrophy. The absorbing surface shrinks.
That is why celiac disease so often does not look like a digestive disease. It looks like whatever the body ran out of first.
Why it gets missed for years
The picture people expect is diarrhea, bloating and weight loss in a child. That version exists and it is the easiest to catch. A large share of cases do not look like that at all.
Blood
Iron deficiency anemia that does not respond to iron supplements, because the surface that absorbs iron is damaged. This is one of the most common ways celiac disease is eventually found.
Bone
Low bone density at an age where it makes no sense, from impaired calcium and fat-soluble vitamin absorption.
Nerve and brain
Numbness and tingling in hands and feet, balance problems, headache, and the fatigue and difficulty concentrating that often gets attributed to stress.
Skin
Dermatitis herpetiformis, an intensely itchy blistering rash on elbows, knees and buttocks. It is celiac disease appearing on the skin, and its presence is essentially diagnostic.
Liver
Unexplained elevated liver enzymes. When no cause is found, this gets labeled cryptogenic, which is the word used when the cause has not been identified. Undiagnosed celiac disease is one of the things that hides there.
Reproductive
Unexplained infertility, recurrent pregnancy loss, and delayed puberty appear in the celiac literature and are rarely connected back to the gut.
A person can carry any combination of these for a decade, see several specialists, and never have the small intestine considered, because none of the complaints sound intestinal.
Celiac disease is not the same as gluten sensitivity
Celiac disease is an autoimmune process with measurable antibodies and visible tissue damage. Non-celiac gluten sensitivity describes people who react to gluten but have neither the antibodies nor the intestinal damage. Both are real. They are not the same condition, they do not carry the same long-term risks, and the distinction matters because celiac disease brings a documented autoimmune and nutritional trajectory that sensitivity does not.
There is also a wheat allergy, which is a true allergic reaction to wheat proteins and can include anaphylaxis. That is a third, separate thing again.
What IgA is, and what happens when you do not make it
IgA is a class of antibody. Its job is guarding surfaces: the lining of the gut, the airway, the mouth, the eyes, anywhere the outside world touches the inside of you. It is in saliva, in tears, in breastmilk. It is the immune system's border patrol rather than its standing army.
Selective IgA deficiency means making little or none of it while the rest of the immune system works normally. Beyond Celiac, drawing on the immunology literature, puts it at somewhere between 1 in 400 and 1 in 800 people of European descent, which makes it the most common inherited immune deficiency there is. Most people who have it never find out, because in many of them it produces no obvious problem on its own.
It becomes a problem in two specific situations, and both of them are the situations this page is about.
Problem one: the test cannot see you
The tTG-IgA test looks for an IgA antibody. If you produce almost no IgA, you produce almost none of that antibody either, however much intestinal damage you have. The result is a negative test in a person with active celiac disease. The technical term is a false negative, and here it is not a laboratory error. It is a predictable consequence of the method.
This is exactly why guidance says to measure total IgA at the same time. If total IgA is low, the laboratory switches to tests that do not rely on it:
- ●tTG-IgG, the same target antibody measured in a different class
- ●DGP-IgG, deamidated gliadin peptide, an antibody against a modified fragment of gluten itself
- ●EMA-IgG, the endomysial antibody in IgG form
These are not specialist tests. Mayo Clinic Laboratories describes the substitution as routine practice once IgA deficiency is known: "when a patient is known to have IgA deficiency, then IgG testing should be pursued." The condition in that sentence is doing the work. The switch happens once somebody knows, and nobody knows if the total IgA was never drawn.
Problem two: IgA deficiency travels with autoimmunity
People with selective IgA deficiency are considerably more likely than the general population to develop an autoimmune condition. Celiac disease is one of the strongest of those associations. Roughly 2 to 3 percent of people with celiac disease are IgA deficient, which is several times the background rate.
Put the two problems side by side and the shape of it is clear. The group most likely to have celiac disease is the same group the standard screening test is least able to detect. The blind spot is not randomly placed. It sits directly over the people who most need to be found.
That is not a conspiracy. It is a design limitation of a good test, and the fix has existed the whole time. It is one additional line on the lab order.
Where else IgA status is quietly assumed
Blood-derived products can contain small amounts of IgA, and people who make none can react to it. The prescribing information for RhoGAM, the Rh immune globulin injection given routinely in pregnancy, states plainly that the product contains a small quantity of IgA and that there is a potential risk of hypersensitivity in IgA deficient individuals. Nobody is screened for IgA status before receiving it.
This site raises that not to alarm anyone about a single injection, but because it is the same missing piece of information showing up in two different rooms. Your IgA status changes how a celiac test should be read and how a blood product should be considered, and it is almost never known.
Celiac disease rarely arrives alone
Autoimmune conditions cluster. Having one raises the odds of having another, and celiac disease sits inside a well-documented group. If you already carry one of these diagnoses, celiac screening is not an exotic request. Several professional bodies recommend it outright.
Autoimmune thyroid disease
This is the strongest and best-studied pairing. Hashimoto's thyroiditis, in which the immune system attacks the thyroid gland, and Graves' disease, in which it drives the gland to overwork, both carry substantially elevated celiac rates. In children and adolescents with autoimmune thyroiditis, reported celiac prevalence runs roughly 4 to 10 percent, far above the general population. Looking from the other direction, people with celiac disease carry roughly twice the odds of autoimmune thyroid disease.
Because of that, celiac screening at the time of thyroid diagnosis is recommended in published guidance rather than merely suggested by advocacy groups.
There is a second, very practical signal in the thyroid guidelines. If someone needs a much higher dose of thyroid hormone replacement than their size and lab values would predict, that is a recognized reason to evaluate for celiac disease, because a damaged small intestine absorbs the medication poorly. A person can spend years having their dose raised without anyone asking why absorption is the problem.
The wider group
Celiac disease appears at elevated rates alongside type 1 diabetes, autoimmune liver disease, Sjogren's syndrome, rheumatoid arthritis, Addison's disease, and in people with a first-degree relative who has celiac disease. It is also strongly associated with Down syndrome, Turner syndrome and Williams syndrome, for reasons that are not fully understood.
The practical point is simple. Celiac disease is not usually found by looking for it directly. It is found because somebody looked at a cluster and asked whether one piece explained the others.
Allergy, atopy and celiac: what is known and what is not
People often arrive at celiac disease carrying a long list of other reactions: food allergies, oral allergy syndrome, reactions to pollen, insect stings or latex. Some of that overlap is well explained. IgA guards mucous membranes, so its absence plausibly affects how the gut and airway handle proteins crossing them, and IgA deficiency is associated with allergic disease as well as autoimmune disease.
Some of it is genuinely unexplained. Whether celiac disease and multi-allergen atopy share a common upstream cause, or simply keep company, has not been settled. There is no study that resolves it.
What this page will not do is manufacture a mechanism to fill that gap. Autoimmune thyroid disease, celiac disease and a long list of allergies occurring together is a recognized clinical picture. It is recognized, and it is not explained. Noticing the pattern is not the same as being told what caused it, and nobody who is being honest is currently offering that answer.
What the gluten-free aisle is made of
Start with the part that is not in question. If you have celiac disease, gluten has to go. That is not a preference or a wellness choice, it is the only treatment there is, and nothing on this page argues otherwise.
The question is what replaces it. Because the diagnosis usually arrives as a single instruction, avoid gluten, and the food industry has already answered it for you. The answer is an aisle of packaged products built mostly on rice flour, with corn, and increasingly with legume flours made from chickpea, lentil and pea.
Each of those carries something wheat did not, and the switch has been measured in people rather than merely theorized.
What was measured
Bulka and colleagues examined national health survey data on 7,471 people, of whom 73 reported eating gluten-free, and published the results in Epidemiology in 2017 under the title "The Unintended Consequences of a Gluten-Free Diet." In the gluten-free group, urinary total arsenic was close to double that of everyone else, a ratio of 1.9 with a confidence interval of 1.3 to 2.6. Blood mercury in the same analysis ran about 70 percent higher, and urinary cadmium was elevated as well.
Two further papers published the same year reached the same conclusion independently, one in Clinical Gastroenterology and Hepatology and one reporting increased heavy metal intake from gluten-free products directly. This is not a single surprising result. It is a finding that replicated immediately and then went nowhere.
Why rice
Rice is unusually good at taking up inorganic arsenic from soil and irrigation water, far better than wheat or most other grains, because of how it is grown in flooded fields and how its roots handle the element. Arsenic is a known human carcinogen. In a diet where rice is an occasional side dish, that matters less. In a diet where rice flour has become the base of the bread, the pasta, the crackers and the cereal, the exposure changes character entirely.
Mercury and cadmium track partly with rice and partly with the fish that often increases in these diets. None of it is disclosed on a gluten-free label, because a gluten-free label is a statement about one protein and nothing else.
Why the legume flours, and this is where the pesticides come in
Chickpea, lentil and dry pea flours have become common in gluten-free products, marketed on their protein content. In North America those crops are frequently sprayed with glyphosate shortly before harvest, not to kill weeds but to kill and dry the crop itself so it can be combined earlier and more evenly. The practice is called pre-harvest desiccation, and it puts the herbicide on the seed at the end of the growing season rather than at the start.
The residues are documented. The Environmental Working Group found glyphosate in most of the hummus and chickpea samples it tested. Broader residue surveys have detected it in roughly half of bean, pea and lentil products. The Canadian Food Inspection Agency has recorded samples of chickpea flour and bean flour exceeding legal residue limits. For context on how permissive those limits are, the European maximum residue level for dry chickpeas is 10,000 parts per billion.
Wheat is also desiccated this way in some regions, so this is not an argument that wheat is clean. It is an argument that switching the flour does not switch off the practice, and that a person who left wheat behind partly to escape it may have walked directly into a crop where the residue limits are higher.
The part that makes it worse, and nobody sequences it
Celiac disease damages the surface that absorbs iron, which is why iron deficiency is one of the most common ways it is found in the first place. So the newly diagnosed person is very often iron deficient at the moment of diagnosis.
Iron is absorbed through a transporter called DMT1, and the body raises DMT1 when iron stores are low, which is sensible. The problem is that DMT1 is not selective. It also carries cadmium and lead across the gut wall. Low iron stores therefore mean more of those metals absorbed from the same meal, which is why blood cadmium runs higher in women of childbearing age, whose ferritin runs lower.
Line the sequence up. A person is diagnosed with celiac disease. They are iron deficient, so their gut is set to absorb divalent metals aggressively. They are told to avoid gluten and are given no further guidance. They move onto rice-based packaged food, which carries more arsenic and cadmium than what they were eating. Nobody has studied that specific combination, in that specific population, at that specific moment. The mechanism is documented, each step of it. The convergence has not been examined.
The gums, and why gluten-free food is full of them
Gluten is not a flavor. It is a structural protein: an elastic network that traps gas, holds moisture and gives dough the ability to stretch without tearing. Take it out and the loaf is sand. So every manufacturer of gluten-free bread has to put something back to do that job, and what goes back in is gums.
This is the reason the gums belong on a celiac page rather than a general one. A person avoiding gluten does not eat the same amount of these additives as everyone else. They eat considerably more, because the products engineered for them require more, and they eat them every day for the rest of their life.
Carboxymethylcellulose, listed as cellulose gum or CMC
This is the one with human evidence, and it is the most relevant to a damaged intestine. Your gut is lined with a mucus layer that keeps bacteria at a distance from the cells underneath. Chassaing and Gewirtz reported in Nature in 2015 that CMC and polysorbate 80, at realistic dietary amounts, thinned that layer in mice, let bacteria encroach into it, and produced low-grade inflammation and metabolic changes.
Then it was tested in people. The FRESH trial, published in Gastroenterology in 2022, fed 16 healthy adults either an emulsifier-free diet or the same diet with 15 grams of CMC daily for 11 days. The CMC group showed reduced microbial diversity and pronounced drops in fecal short-chain fatty acids, which are the compounds intestinal cells use as fuel. In two of the seven people who received it, bacteria had moved into the inner mucus layer, the same signature seen in the mice.
Read the limits honestly: sixteen people, eleven days, and the mucus finding in two of seven. That is a small study. It is also the first time the effect was documented in humans rather than rodents, and the tissue it affects is precisely the barrier a healing celiac intestine is trying to rebuild.
Carrageenan
Extracted from red seaweed, used to thicken and to keep things from separating. The fact that gets quoted most is also true: carrageenan is the standard agent laboratories use to cause inflammation on purpose. Carrageenan-induced paw edema is the classic model for testing anti-inflammatory drugs, because injecting it reliably produces inflammation.
The counterargument deserves stating clearly, because it is the strongest one against this whole section. The Joint FAO and WHO Expert Committee on Food Additives reviewed that work and concluded that injecting a substance into a rat's paw or abdominal cavity says little about eating it, and that the local inflammation produced that way is not relevant to food use. That is a fair objection to the paw model specifically.
What it does not dispose of is the intestinal work: carrageenan oligosaccharides together with carrageenan-degrading bacteria induce intestinal inflammation in germ-free mice, and a small randomized pilot tested a carrageenan-free diet in people with quiescent ulcerative colitis. The honest summary is that the animal and mechanistic evidence is real, the human evidence is thin, and the regulators are not persuaded.
Xanthan gum
Made by feeding sugar to a bacterium called Xanthomonas campestris and collecting what it secretes. It is the workhorse binder of gluten-free baking and it is also an effective laxative, which is why gas, bloating and loose stools are common at higher intakes and are routinely mistaken for the disease not being controlled.
There is one serious documented signal. In 2011 the FDA warned against giving premature infants SimplyThick, a xanthan gum feed thickener, after 15 cases of necrotizing enterocolitis, a severe and often fatal destruction of the bowel, including two deaths. The median exposure before onset was 13 days.
Read the limits honestly: that happened in premature infants, whose intestines are among the most vulnerable tissues in medicine, at concentrations used to thicken every feed. It does not transfer to an adult eating a slice of bread, and this page is not claiming it does. It is worth knowing because it is the only place anyone looked hard at what xanthan gum does to a compromised gut, and what they found was not nothing.
Guar gum
A galactomannan fiber from the guar bean, which is a legume. Two things follow from that. The first is chemical: guar absorbs water and swells 10 to 20 times its volume. The second is immunological: it is a legume protein source in a diet where legume flours are already increasing, which matters to anyone who reacts to legumes.
The swelling is not theoretical. Guar gum was sold in the late 1980s as a bulk appetite suppressant under names including Cal-Ban 3000. The FDA received reports of 18 esophageal obstructions, 7 small bowel obstructions and one death, and moved against the products in 1990.
Read the limits honestly: those were concentrated diet pills taken deliberately to swell in the stomach, not the fraction of a gram in a slice of bread. The obstruction risk does not apply to food-additive amounts. What does carry over is the fermentation: guar ferments in the colon, produces gas, and in a gut already inflamed or recovering that is felt.
Why this gets misread as the disease
Here is the practical trap. Someone removes gluten, feels better for a while, then develops bloating, gas, cramping and unpredictable stools again. The obvious conclusion is cross-contamination, or that the diet is failing, or that something else is wrong. The label says gluten-free, so the food is not suspected.
Several of these additives produce exactly those symptoms in ordinary use, by ordinary mechanisms, at the amounts found in gluten-free baked goods. That is not a claim about long-term harm. It is a much simpler observation: the substitute food can generate the symptoms the substitute food was supposed to resolve, and almost nobody is told to consider it.
The distinction that actually matters
None of this is a case against removing gluten, and reading it that way would be dangerous for anyone with celiac disease. It is a case against assuming the replacement is neutral.
There is a difference between food that never contained gluten and a manufactured substitute for food that did. Meat, fish, eggs, vegetables, fruit, nuts, seeds, dairy, olive oil, potatoes and beans in their whole form were always gluten-free and carry none of this. The arsenic, the cadmium and the glyphosate residues arrive with the flours engineered to imitate bread. The word gluten-free is printed identically on both.
Worth raising with a provider
- ●Given that I was iron deficient at diagnosis, can we track ferritin rather than only hemoglobin, since low iron stores increase absorption of other metals?
- ●Is there any reason to check heavy metal status given how much of my diet has shifted to rice-based products?
- ●Is there dietitian support available that covers what to eat rather than only what to avoid?
That last question is the one that closes the gap. The instruction almost always arrives as a prohibition. What replaces the prohibited thing is left to the patient and, by default, to the manufacturer.
Questions worth asking
None of this is a treatment plan and none of it is a reason to change what you eat or what you take on your own. Celiac disease is diagnosed and managed with a clinician, and the tests below are ordinary tests any provider can order. What follows is language for that conversation.
If you have been tested before
- ●Was a total IgA measured alongside my celiac panel? If not, can that be added, and does my previous negative result still stand once we know it?
- ●Was I eating gluten regularly at the time of the test? If I had already cut it out, what does that do to the reliability of the result?
- ●Which specific tests were run? tTG-IgA alone, or a fuller panel?
If you carry another autoimmune diagnosis
- ●I have Hashimoto's thyroiditis. Published guidance recommends celiac screening at thyroid diagnosis. Has that ever been done for me?
- ●My thyroid hormone dose is higher than expected for my size. Is impaired absorption worth evaluating rather than continuing to raise the dose?
- ●Given the family clustering, should my first-degree relatives be screened?
If the symptoms never fit a diagnosis
- ●My iron deficiency has not responded to supplementation. Could absorption be the problem rather than intake?
- ●My liver enzymes are elevated and no cause has been found. Has celiac disease been ruled out with a panel that included total IgA?
- ●I have unexplained neurological symptoms or low bone density at an age where that is unusual. Is malabsorption on the list of things being considered?
What this page is not
It is not a diagnosis, it is not a protocol, and it is not a recommendation to start or stop anything. It does not tell you to go gluten-free, and it does not tell you not to. Those are decisions to make with a licensed provider who knows your history.
What it is: the information that determines whether a test you have already had can be believed. You were entitled to that before the blood was drawn.
Research, Sources & Further Reading
IgA Deficiency and Celiac Testing
Mayo Clinic Laboratories: serologic testing for celiac disease in patients with IgA deficiency
Sets out why tTG-IgA returns false negatives in IgA-deficient patients and which IgG-based assays are substituted: tTG-IgG, DGP-IgG and EMA-IgG.
news.mayocliniclabs.com, 11 March 2021
Celiac Disease Foundation, screening and diagnosis guidance
Directs that total serum IgA be measured with the celiac panel to exclude selective IgA deficiency and avoid false-negative results.
celiac.org/about-celiac-disease/screening-and-diagnosis
National Institute of Diabetes and Digestive and Kidney Diseases, celiac disease tests
Clinical guidance for health professionals covering the antibody panel, the total IgA requirement, and the need to be consuming gluten at the time of testing.
niddk.nih.gov, celiac disease for health care professionals
Beyond Celiac: IgA deficiency and celiac disease
Records that 2 to 3 percent of people with celiac disease have selective IgA deficiency against a general-population rate of roughly 1 in 400 to 1 in 800, and that IgA-deficient people carry substantially higher odds of autoimmune conditions generally.
beyondceliac.org/celiac-disease/related-conditions/iga-deficiency
Thyroid and the Autoimmune Cluster
"Celiac Disease and Autoimmune Thyroid Disease: The Two Peas in a Pod"
Review of the association between celiac disease and Hashimoto's thyroiditis and Graves' disease, and the case for screening in both directions.
PMC9312543
"A systematic review of guidelines on screening for celiac disease in children with thyroid disease and vice versa"
Collects the published screening recommendations. Records celiac prevalence of roughly 4 to 10 percent in children and adolescents with autoimmune thyroiditis.
Frontiers in Pediatrics, 2025. PMC11994688
"Autoimmune Thyroid Disorders Are More Prevalent in Patients with Celiac Disease: A Retrospective Case-Control Study"
Reports roughly twice the odds of autoimmune thyroid disorders in people with celiac disease.
PMC9605329
"Celiac Disease-Related Conditions: Who to Test?"
Review of which associated conditions warrant celiac screening, including autoimmune thyroid disease.
Gastroenterology, 2024
The Gluten-Free Replacement Diet
Bulka CM et al., "The Unintended Consequences of a Gluten-Free Diet"
National survey data on 7,471 people. Urinary total arsenic nearly doubled in the gluten-free group (geometric mean ratio 1.9, 95% CI 1.3 to 2.6) and blood mercury roughly 70 percent higher, with elevated cadmium.
Epidemiology, 2017
"Accumulation of Heavy Metals in People on a Gluten-Free Diet"
Independent confirmation published the same year.
Clinical Gastroenterology and Hepatology, 2017. PMID 28223206
"Consumption of gluten free products increases heavy metal intake"
Measures the exposure from the products themselves rather than from the people eating them.
NFS Journal, 2017
Environmental Working Group, glyphosate testing in hummus and chickpeas
Detected glyphosate in most samples tested. Chickpea, lentil and dry pea are commonly desiccated with glyphosate before harvest, and those flours are increasingly used in gluten-free products.
ewg.org/research/glyphosate-hummus
Effect of iron deficiency on blood divalent metal concentrations
DMT1, the transporter that absorbs iron, is upregulated when iron stores are low and also carries cadmium and lead. Blood cadmium runs higher in people with lower ferritin, including women of childbearing age.
Reviewed in IntechOpen, 2018; DMT1 metal transport characterized in Am J Physiol Cell Physiol
Gums, Emulsifiers and the Mucus Layer
Chassaing B, Gewirtz AT et al., "Dietary emulsifiers impact the mouse gut microbiota promoting colitis and metabolic syndrome"
Carboxymethylcellulose and polysorbate 80 at dietary-realistic amounts thinned the intestinal mucus layer, permitted bacterial encroachment, and produced low-grade inflammation and metabolic change in mice.
Nature, 2015
"Randomized Controlled-Feeding Study of Dietary Emulsifier Carboxymethylcellulose Reveals Detrimental Impacts on the Gut Microbiota and Metabolome" (the FRESH trial)
16 healthy adults, 15 g per day of CMC for 11 days. Reduced microbial diversity, pronounced reductions in fecal short-chain fatty acids and free amino acids, and microbiota encroachment into the inner mucus layer in two of seven CMC participants. Small and short, and the first human documentation of the effect.
Gastroenterology, 2022. PMID 34774538
JECFA technical report on carrageenan
The Joint FAO and WHO Expert Committee on Food Additives reviewed the carrageenan inflammation literature and concluded that injection models such as paw edema are not relevant to dietary exposure. Included here because it is the strongest objection to the carrageenan case and the page does not omit it.
FAO/WHO JECFA
"Randomized controlled pilot study: effect of carrageenan emulsifier on inflammation and gastrointestinal symptoms in quiescent ulcerative colitis"
Small human pilot testing a carrageenan-free diet against carrageenan re-exposure in people with inactive ulcerative colitis.
Food & Nutrition Research
FDA advisory on SimplyThick, and "Late onset necrotizing enterocolitis in infants following use of a xanthan gum-containing thickening agent"
15 cases of necrotizing enterocolitis in premature infants, including two deaths, median 13 days of exposure. Applies to premature infants at thickening concentrations, not to adults at food-additive amounts.
FDA consumer advisory, 2011; Journal of Pediatrics, 2012. PMID 22575248
"Esophageal and small bowel obstruction from guar gum-containing diet pills: analysis of 26 cases reported to the Food and Drug Administration"
18 esophageal and 7 small bowel obstructions and one death from concentrated guar gum appetite suppressants, leading to FDA action against Cal-Ban 3000 in 1990. Concentrated supplement doses, not food-additive amounts.
American Journal of Gastroenterology, 1992. PMID 1329494