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Do Lentils Cause Gas? Causes, Symptoms & Risk Factors


Lentils are a type of edible pulses that are highly nutritious, affordable, and easy to cook with. However, some people experience excessive gas and bloating after eating lentils. This article will explore why lentils cause gas, the symptoms and risk factors involved, and tips to prevent lentil-related gas.

How Do Lentils Cause Gas? 

There are several reasons why lentils may produce gas for some people:

Lentils May Produce Gas For Some People

? Fiber content – Lentils are a rich source of fiber, containing about 16 grams per cooked cup. Fiber is not digested in the small intestine and passes to the colon, where it is fermented by gut bacteria, producing gas as a byproduct. The high fiber content of lentils compared to other foods promotes more gas production.

? Oligosaccharides – Lentils contain starch-related compounds called oligosaccharides, including raffinose, stachyose, and verbascose. The human small intestine lacks the enzymes needed to fully digest these carbs. When they reach the colon, bacteria ferment them, again releasing gases like carbon dioxide, methane, and hydrogen.

? Resistant starches – Some of the starch in lentils resists digestion and acts like fiber in the gut. This also leads to fermentation and gas when it reaches the large intestine. Cooking, then cooling lentils, turns more of the starch into resistant starch through a process called retrogradation.

? Individual sensitivity – Some people naturally produce more gas from fiber than others based on the types of gut bacteria they have. People with sluggish digestion or small intestinal bacterial overgrowth may experience more bloating and flatulence from lentils.

? Anti-nutrients – Lentils contain antinutrients like phytic acid and trypsin inhibitors which can interfere with digestion, leaving more undigested carbs to ferment in the colon. However, soaking, sprouting, or fermenting lentils reduces these antinutrients.

? Improper cooking – Undercooked lentils cause more digestive issues. Cooking them thoroughly helps break down lectins, another antinutrient, and makes nutrients more accessible. Overcooking increases resistant starches.

? Other compounds – Lentils contain protein compounds called lectins and peptides that some find irritating to the digestive system. They also provide folate which helps grow gut bacteria.

In summary, lentils’ high fiber, oligosaccharide, and starch contents coupled with incomplete digestion and individual sensitivity are the main causes of lentil-related gas. Using preparation methods to reduce antinutrients, cook lentils properly, and pair with other foods can help reduce unwanted side effects.

Symptoms of Lentil Gas 

The most common symptoms caused by lentil-associated gas include:

? Bloating and abdominal distension

? Flatulence – Passing excessive gas through the rectum

? Abdominal cramps and discomfort

? Gurgling or rumbling noises from the stomach

? Burping and belching

? Feeling of fullness and pressure in the abdomen

? Diarrhea or loose stools in some cases

The symptoms typically begin 30 minutes to 2 hours after eating lentils and beans. Some people may also experience nausea. The severity can vary based on the individual, the amount eaten, and preparation methods. Keeping portion sizes moderate and introducing lentils gradually can help minimize symptoms.

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Risk Factors for Lentil Gas 

Certain individuals are more prone to developing gas and bloating from lentils:

? Preexisting conditions like irritable bowel syndrome (IBS), intestinal parasites, small intestinal bacterial overgrowth (SIBO), diverticulitis, and inflammatory bowel disease.

? Food intolerances – Most commonly, the oligosaccharides in lentils can trigger gas and discomfort. 

? Having an allergy to lentils – This can cause more systemic symptoms like hives, swelling, and anaphylaxis in those with IgE-mediated hypersensitivity.

? Age – Older adults often have reduced digestive enzymes and more sensitive GI tracts.

? Low stomach acid levels – This impairs the digestion of lentils and other proteins.

? Eating large portions – Consuming more lentils in one sitting increases the amount of fermentable carbs.

? Sudden increases in dietary fiber – It’s best to ramp up high-fiber foods gradually.

? Sedentary lifestyle – Regular exercise helps move gas through the intestines.

Tips To Prevent Lentil Gas 

Here are some tips to minimize gas and bloating from eating lentils:

? Soak dry lentils for 3-12 hours before cooking to reduce oligosaccharides, phytic acid, and lectins. Discard soaking water.

? Sprout lentils to further decrease antinutrients. 

? Cook lentils thoroughly until very soft to improve digestibility.

? Avoid overcooking lentils to a mushy consistency as this increases resistant starches. 

? Start with smaller 1/4 cup portions and gradually increase as tolerated.

? Consume lentils as part of a mixed meal with other healthy foods like grains, vegetables, and lean proteins to slow digestion.

? Spice lentil dishes with carminatives like garlic, ginger, turmeric, cumin, and coriander which may relieve gas.

? Chew lentils very thoroughly to aid digestion.

? Stay well hydrated to prevent constipation from lentil fiber.

? Take probiotic supplements to assist with fermentation and gas tolerance.

? Exercise regularly, especially walks after eating legumes.

? Consider a bean-zyme digestive enzyme supplement.

? Use digestive herbs like peppermint, chamomile, and cinnamon which may reduce gas production.


In conclusion, lentils are very healthy foods but their high fiber, starch, and oligosaccharide content can cause excessive gas, bloating, and abdominal discomfort in some individuals. Those with gastrointestinal conditions need to be especially cautious. However, proper preparation methods like soaking, sprouting, and thorough cooking can make lentils more digestible and tolerable.

Starting with small servings, eating lentils with other foods, and using cooking spices, probiotics, exercise, and digestive aids can all help minimize unwanted side effects. Working lentils into the diet gradually lets most people enjoy their nutritional benefits with minimal gas.

Read More- Watermelon And Type 2 Diabetes: Is Watermelon Good For Diabetes?


Q: Why do lentils give some people gas?

A: Lentils contain oligosaccharides, resistant starches, and insoluble fiber that humans lack the enzymes to fully digest. When these carbohydrates reach the colon, gut bacteria ferment them producing gas. Anti-nutrients and improper cooking also contribute.

Q: Are canned lentils less gassy? 

A: Potentially, the canning process may help break down some fibers and antinutrients. Rinsing canned lentils well can further help. But lentils canned with added salt have fewer benefits.

Q: Can lentil gas be prevented with medication?

A: Certain over-the-counter medications like simethicone, Beano, and activated charcoal may help reduce gas production. Digestive enzyme supplements can also improve lentil digestion. Probiotics may make gas less bothersome.

Q: Do all lentil varieties cause gas?

A: All lentil types have similar nutritional profiles and effects on digestion. But smaller lentils with the skins removed may be gentler on digestion for some people.

Q: Will I stop having gas if I eat lentils regularly? 

A: It’s possible to adapt and build a tolerance to legume gas over time. But some people never adjust well and need to limit intake. Introducing them gradually makes adaptation more likely.

Dr. Harold Gojiberry is not just your ordinary General Practitioner; he is a compassionate healthcare provider with a deep commitment to patient well-being and a passion for literature. With extensive medical knowledge and experience, Dr. Gojiberry has made a significant impact in the field of healthcare, particularly in the area of liver diseases and viral hepatitis.

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