Health and Me

Rachel V Thomas

Why You Suddenly Can’t Tolerate Foods You Once Ate Easily

Ever wondered why a food you have eaten comfortably for years suddenly starts causing bloating, abdominal discomfort or bowel changes? The food may not have changed — your gut may have.

Food intolerance can develop in adulthood as the gut microbiome, digestive enzymes, intestinal lining and gut-brain interactions change with age, illness, medications, diet, stress and other factors.

“The intestine is a dynamic ecosystem. Its microbiome, immune system, intestinal lining and digestive enzymes are constantly changing and adapting to factors such as age, infections, antibiotics, medications, diet, stress and hormonal changes,” Dr. Amit Maydeo, Chairman, Institute of Gastrosciences, Sir HN Reliance Foundation Hospital, told HealthandMe.

Dr. Geeta Malkan-Billa, Director of Gastroenterology &amp; Hepatology, highlighted several changes that can affect food tolerance:

<ul><li>Digestive enzymes: Lactase levels decline after childhood. For some, lactose intolerance can appear in their 20s–40s. Diamine oxidase, which helps break down histamine, can also decrease.</li><li>Gut microbiome: Antibiotics, infections, illness and major diet changes can alter gut bacteria, changing how foods are fermented and potentially causing more gas or bloating.</li><li>Past infections: Gastroenteritis can affect the gut lining, digestive enzymes and gut nerves for months, making certain foods harder to tolerate.</li><li>Gut lining: NSAIDs, tobacco, heavy alcohol use and chronic stress can increase intestinal permeability and trigger low-grade immune activity.</li><li>Gut movement: Ageing, surgery, <a href="https://www.healthandme.com/health/diabetes">diabetes</a>, thyroid problems and GLP-1 medications can alter how quickly food moves through the gut, affecting fermentation and potentially contributing to bacterial overgrowth.</li></ul>

<h2>Why Does A Familiar Food Suddenly Cause Problems?</h2>

Dr Amit said that changes in gut bacteria can alter how carbohydrates and fibers are fermented, while a more sensitive gut lining can make previously tolerated foods feel uncomfortable.

A previous gut infection can also leave the gut more sensitive. After gastroenteritis, some people develop post-infectious IBS, which can make certain foods trigger symptoms.

Stress can further amplify these sensations through the gut-brain axis. As the nervous system becomes more sensitive, normal amounts of gas or intestinal distension may feel uncomfortable, Dr. Amit said.

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Not every reaction to food is an intolerance. Some conditions can look similar but are actually different:

<ul><li><a href="https://www.healthandme.com/health/celiac-disease">Celiac disease</a>: An autoimmune condition that can develop at any age, rather than simply an inability to digest gluten or wheat.</li><li>Food allergy: True IgE-mediated food allergies can also develop during adulthood.</li></ul>

So, a new reaction to a familiar food should not automatically be labelled as food intolerance.

Before cutting gluten from your diet, get celiac serology testing, as going gluten-free beforehand can affect the results.

A two-week food and symptom diary can also help identify patterns. Note:

<ul><li>What you ate</li><li>How much you ate</li><li>When symptoms appeared</li></ul>

The key is to remember that the food itself may not have suddenly become “bad” for you. Your gut’s ability to process and tolerate it may have changed.

Sometimes, however, a new food allergy or another gastrointestinal disorder may need to be ruled out.

Certain symptoms should not simply be blamed on food intolerance. See a doctor if you experience:

<ul><li>Unexplained weight loss</li><li>Blood in the stool</li><li><a href="https://www.healthandme.com/health/anaemia">Anaemia</a></li><li>Symptoms that wake you at night</li><li>Swelling</li><li>Difficulty breathing</li></ul>

These symptoms need medical evaluation rather than simply eliminating foods from your diet.

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Ever wondered why a food you have eaten comfortably for years suddenly starts causing bloating, abdominal discomfort or bowel changes? The food may not have changed — your gut may have.Food intolerance can develop in adulthood as the gut microbiome, digestive enzymes, intestinal lining and gut-brain interactions change with age, illness, medications, diet, stress and other factors.What Changes Inside The Gut?“The intestine is a dynamic ecosystem. Its microbiome, immune system, intestinal lining and digestive enzymes are constantly changing and adapting to factors such as age, infections, antibiotics, medications, diet, stress and hormonal changes,” Dr. Amit Maydeo, Chairman, Institute of Gastrosciences, Sir HN Reliance Foundation Hospital, told HealthandMe.Dr. Geeta Malkan-Billa, Director of Gastroenterology & Hepatology, highlighted several changes that can affect food tolerance:Digestive enzymes: Lactase levels decline after childhood. For some, lactose intolerance can appear in their 20s–40s. Diamine oxidase, which helps break down histamine, can also decrease.Gut microbiome: Antibiotics, infections, illness and major diet changes can alter gut bacteria, changing how foods are fermented and potentially causing more gas or bloating.Past infections: Gastroenteritis can affect the gut lining, digestive enzymes and gut nerves for months, making certain foods harder to tolerate.Gut lining: NSAIDs, tobacco, heavy alcohol use and chronic stress can increase intestinal permeability and trigger low-grade immune activity.Gut movement: Ageing, surgery, diabetes, thyroid problems and GLP-1 medications can alter how quickly food moves through the gut, affecting fermentation and potentially contributing to bacterial overgrowth.Why Does A Familiar Food Suddenly Cause Problems?Dr Amit said that changes in gut bacteria can alter how carbohydrates and fibers are fermented, while a more sensitive gut lining can make previously tolerated foods feel uncomfortable.A previous gut infection can also leave the gut more sensitive. After gastroenteritis, some people develop post-infectious IBS, which can make certain foods trigger symptoms.Stress can further amplify these sensations through the gut-brain axis. As the nervous system becomes more sensitive, normal amounts of gas or intestinal distension may feel uncomfortable, Dr. Amit said.It May Not Be Food IntoleranceNot every reaction to food is an intolerance. Some conditions can look similar but are actually different:Celiac disease: An autoimmune condition that can develop at any age, rather than simply an inability to digest gluten or wheat.Food allergy: True IgE-mediated food allergies can also develop during adulthood.So, a new reaction to a familiar food should not automatically be labelled as food intolerance.What Should You Do?Before cutting gluten from your diet, get celiac serology testing, as going gluten-free beforehand can affect the results.A two-week food and symptom diary can also help identify patterns. Note:What you ateHow much you ateWhen symptoms appearedThe key is to remember that the food itself may not have suddenly become “bad” for you. Your gut’s ability to process and tolerate it may have changed.Sometimes, however, a new food allergy or another gastrointestinal disorder may need to be ruled out.When Should You See A Doctor?Certain symptoms should not simply be blamed on food intolerance. See a doctor if you experience:Unexplained weight lossBlood in the stoolAnaemiaSymptoms that wake you at nightSwellingDifficulty breathingThese symptoms need medical evaluation rather than simply eliminating foods from your diet.

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