Gluten-free: essential for some, a marketing label for most.
For people with coeliac disease, a gluten-free diet isn't a choice. It's the treatment. For everyone else, it's mostly an expensive way to eat less wholegrain. Here's the difference, and why you test before you cut.
The short version
- What it is
- No wheat, barley or rye, for life, down to the crumbs.
- Good for
- Coeliac disease, where it's the only treatment there is. Also needed for wheat allergy.
- Bad at
- Doing anything special for people without those conditions.
- Evidence
- Strong for coeliac disease. Weak to none for everyone else.
- Our take
- Get tested first, while you're still eating gluten. If it's coeliac, the gluten-free diet belongs to your doctor and dietitian, and we filter around it.
What a gluten-free diet actually is
Gluten is a group of proteins in wheat, barley and rye, plus their relatives like spelt. It's what makes dough stretchy and bread chewy. A gluten-free diet removes all of it: bread, pasta, most cakes, beer, and the hidden stuff in sauces, soups and coatings.
The people who truly need it have coeliac disease, an autoimmune condition where eating gluten makes the immune system attack the lining of the small intestine. The gut then absorbs nutrients badly.1 About 1.4% of people worldwide test positive on blood tests, and about 0.7% have it confirmed by biopsy.2 In Asia the confirmed figure is around 0.6%, so it's not just a European thing.2
There is no cure. The gluten-free diet controls symptoms and lowers the risk of long-term complications, and people with coeliac disease have to avoid gluten for life.13
How it works in your body
In coeliac disease, every bit of gluten restarts the immune attack. The gut lining has tiny finger-like folds, called villi, that soak up nutrients. Gluten flattens them. Remove gluten and, over time, they can recover.
How strict is strict? In an Italian trial, adults with coeliac disease took a daily capsule with 0, 10 or 50 mg of gluten for 90 days. That's a few crumbs of bread. The 50 mg group showed measurable damage to the gut lining. The 10 mg group didn't, on average, though one person relapsed.4 So "a little bit won't hurt" is exactly wrong here. This is why EU law only allows a "gluten-free" label on food with no more than 20 mg of gluten per kilo.5
Symptoms vary a lot: diarrhoea, bloating, wind, tiredness, weight loss, an itchy rash, anaemia. Mild cases often get missed or labelled as IBS.1
What you eat, what you don't
Eat
- Meat, fish, eggs, tofu, legumes
- Rice (brown and red too), quinoa, buckwheat, millet, potatoes
- Rice noodles, corn tortillas
- All vegetables and fruit
- Milk, yoghurt, cheese
- Nuts, seeds, olive oil
- Oats only if labelled gluten-free, and only if your dietitian says yes
Forget it
- Wheat, spelt, rye, barley: bread, Brezel, Semmel, pasta, couscous
- Schnitzel breadcrumbs, tempura batter, wheat noodles in your mee or ramen
- Regular soy sauce (usually brewed with wheat)
- Beer, lager, stout, ale
- Malt vinegar, barley malt extract
- Cakes, biscuits, pastries, unless certified gluten-free
Alcohol on a gluten-free diet
Gluten-free
- Wine, sparkling wine, sherry, port
- Cider
- Spirits, even malt whisky: distilling removes the gluten
- Beer labelled gluten-free (20 ppm or less)
Contains gluten
- Ordinary beer, lager, stout and ale
- Wheat beer, the Weissbier your neighbour swears by
- "Gluten-removed" barley beer still has to say "contains barley": ask your dietitian
These come from Coeliac UK's guidance.6 Note that drinks over 1.2% alcohol don't have to list every ingredient, only allergens, so read the label.6
50 Club: not on a prescribed diet. Ask your doctor or dietitian what's safe for you. All the general details are in our alcohol guide.
What it's good for, with proof
Coeliac disease: it's the treatment
There is no pill for coeliac disease. The gluten-free diet is how symptoms are controlled and how the risk of complications like osteoporosis, anaemia and some bowel cancers is brought down.1 No other diet in this list has a job this clear.
Wheat allergy
Wheat allergy is a different thing: an allergic reaction, not an autoimmune one. "Cereals containing gluten" are one of the 14 allergens EU law makes food companies declare.7 Which grains you need to avoid, and how strictly, is for an allergist to sort out.
The uncomfortable truth
"Gluten-free is healthier." Not for people without coeliac disease. A Harvard study followed over 110,000 adults for about 26 years. Eating more or less gluten made no difference to heart disease risk. The authors warned that avoiding gluten can mean eating fewer whole grains, which are linked to a healthier heart.8 A gluten-free brownie is still a brownie.
"I feel better without gluten, so I'm gluten-sensitive." Maybe. Some people do feel better. But in a careful Australian trial, 37 people who said they were gluten-sensitive were first put on a low FODMAP diet. They all improved. Then gluten was slipped back in without them knowing. Only about 8% reacted specifically to gluten.9 For many, the culprit is probably the fermentable carbs in wheat, not the gluten.
"I'll go gluten-free first and see if it helps, then get tested." This is the big one. Coeliac tests look for antibodies your body only makes while you're eating gluten. Cut it first and the test can come back falsely negative.3 Coeliac UK suggests at least 3 g, ideally 6 g, of gluten a day for at least six weeks before testing.3 Home test kits don't give a diagnosis.3
The risks
- Skipping the diagnosis. Going gluten-free without testing can hide coeliac disease, and then nobody checks your bones, iron or vitamins.13
- Fewer whole grains. Swap wholemeal bread for white gluten-free bread and you lose fibre. Use brown rice, buckwheat, quinoa, legumes.8
- Processed "free-from" food. Gluten-free biscuits and cakes are still biscuits and cakes. Our never list (added sugar, sweets, white bread) applies to the gluten-free versions too.
- Hidden gluten and cross-contact. Shared toasters, fryers and flour-dusted kitchens. Oats are often contaminated in the field or the mill. In the EU, oats in food sold as gluten-free must be specially produced and stay under 20 mg/kg.5 Some people with coeliac disease react even to pure oats.1
- Eating out. Hawker centres run on soy sauce, wheat noodles and shared woks. German and Austrian kitchens run on Semmel and Panier. Ask, every time.
- Cost. Specialist bread and pasta cost more. Naturally gluten-free food (rice, potatoes, meat, fish, vegetables) doesn't.
Allergies: watch the staples
Gluten-free products replace wheat with other ingredients, and some of them are allergens too.
| Gluten-free staple | Allergen (EU list of 14)7 | Swap |
|---|---|---|
| Gluten-free bread and cakes | Often eggs, milk, soy | Rice, potatoes, buckwheat |
| Lupin flour in gluten-free baking | Lupin | Rice or buckwheat flour |
| Almond flour, nut-based crackers | Tree nuts | Rice crackers, seed crackers |
| Tamari (wheat-free soy sauce) | Soy | Coconut aminos, salt and lime |
| Sesame seed crackers and bars | Sesame | Pumpkin and sunflower seeds |
| Gluten-free oats | Cereals containing gluten (oats are on the EU list) | Buckwheat or millet flakes |
Don't go gluten-free if you…
- haven't been tested for coeliac disease yet but think you might have it (test first, eat gluten until then)
- have weight loss, anaemia or ongoing gut symptoms nobody has checked
- are cutting gluten because an influencer said it's "inflammatory"
- have ever had an eating disorder, unless your doctor prescribes it
Healthen me asks about all of these and gives you a different plan if any apply.
How we use gluten-free in your plan
As a filter. If you tell us you have coeliac disease or a wheat allergy, the plan removes wheat, barley, rye and their relatives from your meals and builds them around naturally gluten-free food: rice, potatoes, buckwheat, legumes, meat, fish, eggs, vegetables.
What we don't do: diagnose you, set your gluten threshold, or decide about oats. The diagnosis and the diet are your doctor's and dietitian's. Healthen me asks about coeliac disease and sends you to your doctor if you have symptoms but no test. Our filter can't check a hawker stall's wok or a bakery's flour dust. You still read labels and ask.
If you just prefer to skip gluten without a medical reason, you can tick it as a preference. You won't get extra health points for it, and we'll make sure whole grains like brown rice and buckwheat stay on your plate.
This article is general information, not medical advice. If you have a medical condition or take medication, talk to your doctor before changing how you eat.
Sources
- NHS. Coeliac disease. nhs.uk/conditions/coeliac-disease
- Singh P, Arora A, Strand TA et al. Global prevalence of celiac disease: systematic review and meta-analysis. Clinical Gastroenterology and Hepatology 2018;16(6):823–836.e2. doi.org/10.1016/j.cgh.2017.06.037
- Coeliac UK. Getting diagnosed; and What is the gluten free diet? coeliac.org.uk/about-coeliac-disease/getting-diagnosed; coeliac.org.uk/…/what-is-the-gluten-free-diet
- Catassi C, Fabiani E, Iacono G et al. A prospective, double-blind, placebo-controlled trial to establish a safe gluten threshold for patients with celiac disease. American Journal of Clinical Nutrition 2007;85(1):160–166. doi.org/10.1093/ajcn/85.1.160
- Commission Implementing Regulation (EU) No 828/2014 on the requirements for the provision of information to consumers on the absence or reduced presence of gluten in food. eur-lex.europa.eu/eli/reg_impl/2014/828/oj
- Coeliac UK. Alcohol. coeliac.org.uk/…/alcohol
- Regulation (EU) No 1169/2011 on food information to consumers, Annex II (the 14 allergens). eur-lex.europa.eu/eli/reg/2011/1169/oj
- Lebwohl B, Cao Y, Zong G et al. Long term gluten consumption in adults without celiac disease and risk of coronary heart disease: prospective cohort study. BMJ 2017;357:j1892. doi.org/10.1136/bmj.j1892
- Biesiekierski JR, Peters SL, Newnham ED et al. No effects of gluten in patients with self-reported non-celiac gluten sensitivity after dietary reduction of fermentable, poorly absorbed, short-chain carbohydrates. Gastroenterology 2013;145(2):320–328. doi.org/10.1053/j.gastro.2013.04.051