Top doctor shares 6 reasons protein powder is upsetting your stomach

Health risks of protein intake: When you increase protein intake, your body needs more water to help remove urea or it can lead to constipation (Image: Canva)

• Sudden increase in protein intake can upset gut health
• Cheap powders and improper hydration worsen digestive issues
• Gradual intake, quality supplements, and hydration are advised

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Protein is one of the most important nutrients your body needs to build muscles, strengthen bones, manage cravings, and more. However, most people start to take it ambitiously, increasing the amounts significantly at once, others buy cheap powders or overlook hydration. Doing so takes a toll on their digestive health and causes an upset stomach.

Dr Anshuman Kaushal, specialising in advanced laparoscopic GI, bariatric, and laser surgeries, took to his Instagram account, and shared six reasons your intake of protein powder may be causing gut health issues. “You increased protein…and your gut declared war. Gas, bloating, and discomfort. And now you think protein is the villain. It isn’t,” he said.

Increasing protein intake overnight

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A post shared by Dr Anshuman Kaushal MD FACS (@theangry_doc)

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While most of us blame protein, the problem is with processing. “Digesting protein is one of the most complex processes for the body. Carbohydrates start digesting as soon as they enter the mouth, but protein needs VIP entry. It requires stomach acid (HCl) to denature proteins and activate pepsin. It relies on pancreatic enzymes like trypsin, and chymotrypsin, making it a full team effort. Protein is unlike sugar or refined carbs that digest easily and cause a sugar spike,” he explained.

When you increase the intake from 30 gm to 100 gm overnight, your body and intestine both revolt. “This huge intake confuses the gut, shocks the microbiomes, and it takes at least 3 to 4 weeks for your body to adapt to this change. But who has the patience?”

What you don’t realise is that your digestion is undertrained for such a change.

Also read | Protein powder or real food? US doctor on why food quality and balance matter more

Real problem: High stress, poor sleep, and more

Dr Kaushal pointed out that while people think something is wrong with their digestion, they often overlook factors like high stress, poor sleep or sleeping late at night that contribute to the problem. “You think your HCL is low, pepsin is not activated, and protein digestion is poor, making undigested protein reach the colon, where bacteria produces gases like ammonia and hydrogen sulphide. This causes bloating and excessive farting,” he said.

Taking the wrong variety of supplement

Many people end up buying whey concentrate because it is cheaper, not realising it contains 5 to 6 per cent lactose. “While you think the supplement is not suiting you, the problem is with the product. Instead, take whey isolate, hydrolysate, or water, these have less than 1 per cent lactose. It’s a simple switch with no drama,” Dr Kaushal suggested.

Chewing and drinking improperly

Dr Kaushal added, "If you gulp large amounts, enzymes don’t respond properly to the intake. Chewing properly helps, so avoid watching reels while having protein supplements, foods, or drinking protein shakes.”

Drinking less water

Hydration is often overlooked but plays a crucial role. When you increase protein, your body needs more water to help remove urea or it can lead to constipation. However, people often blame protein supplements instead.

Buying cheap powders

Buying cheap powders is yet another reason for an upset stomach, as these contain artificial sweeteners and more chemicals than protein. So the cause is not the protein powder but the quality of products you buy.

How to treat the problem?

Dr Anshuman suggested, “The solution is to become sensible and smart. Firstly, increase the intake gradually every week — from 10 to 15 gm and spread 20 to 40 gm across 3 to 4 meals. Make smart choices like eggs, curd, whey isolate, well-cooked lentils. Chew your food properly and hydrate with 2.5 to 3 litres of water. Consume soluble fibre, but don’t overload your body with protein and fibre. Take support of enzymes and probiotics if necessary.”

FAQs on Protein Powder

1. How does protein powder help the body?

Protein supports muscle building, bone strength, and better control of cravings. It is useful when daily protein from food is insufficient, but must be taken correctly to avoid digestive discomfort.

2. Why does protein powder sometimes cause gas and bloating?

Sudden high intake, poor digestion, or low-quality powders can overwhelm the gut. This may lead to gas, bloating, and discomfort, making people wrongly blame protein instead of how they use it.

3. Can taking the wrong type of protein powder upset the stomach?

Yes. Whey concentrate has more lactose, which can cause gas and bloating in sensitive people. Switching to whey isolate or hydrolysate, with minimal lactose, often eases these issues.

4. How should I increase my protein powder intake safely?

Increase protein gradually, about 10–15 gm per week, and divide 20–40 gm across 3–4 meals. Chew food well, drink 2.5–3 litres of water, and consider enzymes or probiotics if needed.

5. Do cheap protein powders affect gut health?

Cheap powders may contain artificial sweeteners and excess additives that irritate the gut. Digestive issues often arise from poor product quality, not from protein itself.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for specific health diagnosis.