Food sensitivities

Reviewed by Dr. Nikita Dinger, Founder & CEO, BioMeBar. Last reviewed 7 October 2026.

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What it is

“Food sensitivity” is an umbrella term, and it covers three quite different things. A food allergy involves the immune system and can be dangerous. Coeliac disease is an autoimmune reaction to gluten. A food intolerance, such as lactose intolerance, is a digestive problem without an allergic mechanism. When people say they are sensitive to a food, they usually mean the third kind, or something that has not been clearly sorted yet.

Sorting out which you have matters, because the safe response differs. The lactose intolerance versus milk allergy page shows how different these two can be.

Common symptoms

• Bloating, gas or loose stools within a few hours of a particular food
• Cramps after milk, ice cream or a large bowl of kheer
• Flushing, headaches or an itchy mouth after certain foods, which can relate to histamine or to an allergy
• Nausea after very fatty or very spicy meals
• Symptoms that vary with portion size, so a little paneer is fine and a lot is not

Hives, swelling, wheeze or faintness after eating are not intolerance. They point to allergy and need urgent medical care.

How gut bacteria may be involved

Many adults worldwide make less lactase, the enzyme that digests lactose, after childhood. Undigested lactose reaches the colon, where bacteria ferment it and produce gas, which is why some people feel unwell after a glass of milk. Bacteria in fermented foods like curd have their own lactase activity, which is one reason curd and chaas are often easier than milk.

For other carbohydrates, such as fructose and certain fibres grouped as FODMAPs, the colon community determines how much gas is made. Research on how gut bacteria shape allergy risk, especially in early childhood, is active but still developing, and no bacterial test can currently diagnose a food allergy.

Commercial IgG food sensitivity tests are widely sold in India. Allergy societies do not recommend them for diagnosing intolerance, because IgG levels largely reflect exposure to a food, not a problem with it.

Diet and everyday habits

A supervised elimination and reintroduction is the most reliable way to identify a trigger, and it should not turn into a permanent restriction. See our elimination diet page for the structure.

• Pick one suspect at a time, remove it for two to four weeks, then reintroduce it in measured portions
• For lactose, try lactose-free milk, fresh curd, chaas, paneer and ghee, which carry less lactose than milk
• If wheat is the question, do not cut it out before coeliac testing. Rice, jowar, bajra and ragi rotis are everyday options once testing is complete
• Read labels for hidden milk, soy, nuts, sesame and wheat in packaged snacks
• Keep a diary and review it with a dietitian, especially if the list of avoided foods starts to grow

Cooking method changes tolerance. Dal that is pressure-cooked until soft, batter that has fermented properly for idli or dosa, and soaked and sprouted pulses may each be easier than the same food prepared quickly. Taking time with these steps is a traditional habit that suits sensitive guts.

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When to see a doctor first

• Any swelling of lips, tongue or face, hives, wheezing, vomiting or collapse after eating, which need emergency care
• Persistent diarrhoea, weight loss, anaemia or growth faltering in children
• Blood in the stool
• A family history of coeliac disease, or symptoms such as long-standing fatigue, mouth ulcers or an itchy blistering rash
• Avoiding several foods already, or a child with restricted eating

How BioMeBar approaches it

We start with what you tell us about the foods and the symptoms, along with your gut profile. We match a personalised synbiotic and give food and lifestyle guidance that aims to keep your diet as broad as it safely can be, with check-ins to see how it goes.

We do not diagnose, treat or cure allergies or intolerances, and we do not offer sensitivity test results as proof of one.

Common questions

Is lactose intolerance common in India?

It is commonly reported in Indian adults, but the proportion varies by region and by how it is measured. Many with it can still take small amounts, curd and chaas.

Can a food intolerance go away?

Some people find their tolerance changes, especially after a gut infection has settled, though this is not predictable. Retesting a food after a break, with medical or dietitian guidance, is the usual way to find out.

Should I go gluten-free if wheat makes me bloated?

See a doctor for coeliac testing first, while you are still eating gluten. Bloating after wheat can also come from fructans, which are not gluten.

Are children different?

Yes. Milk, egg, peanut and wheat reactions in children need a paediatrician, and food should not be eliminated without advice because growth and nutrition are at stake.

Sources

• NIAID-sponsored Guidelines for the Diagnosis and Management of Food Allergy in the United States (2010)
• ACG Clinical Guideline: Diagnosis and Management of Celiac Disease (2023)
• EAACI Guidelines on Food Allergy
• ICMR-NIN Dietary Guidelines for Indians

Talk to us

If you would like to know whether BioMeBar can support you, message us on WhatsApp. Tell us your symptoms and your pincode and we will take it from there. Not sure where to start? Take the free gut assessment, which takes about three minutes.

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BioMeBar provides nutrition and gut health guidance and does not replace medical care. See a doctor for severe, persistent or worrying symptoms.