The high-protein trend has a gut wellness side effect nobody is talking about enough.
High-protein eating is having a moment. Every nutritionist, fitness account, and women's health platform seems to be recommending more protein, especially for women in their thirties and forties managing energy, muscle mass, and the demands of perimenopause. Much of this advice appears well-founded. But a question that's getting more attention in gut health research is what all that extra protein may be doing to your gut microbiome. And the picture appears more complicated than the trend suggests.
What May Be Happening to Protein in Your Gut
When you eat protein, your gut works to break it down. Most appears to be digested and absorbed in the small intestine. But some, particularly from animal sources, seems to reach the large intestine undigested, where it may become food for your gut bacteria. This process is called proteolytic fermentation, and while fermentation in the gut is generally thought to be beneficial, research suggests this particular type may produce compounds that could be associated with gut irritation in some people.
This seems to be especially relevant for people who may already be dealing with a sensitive or disrupted microbiome. Some of these compounds appear to be associated with increased gut permeability in certain individuals, though researchers are careful to note that the science here is still developing and individual responses seem to vary considerably. If your gut has felt more reactive since you increased your protein intake, this mechanism may partly explain why.
The Fibre Problem Nobody Seems to Talk About
Here's what many high-protein diets appear to have in common: they may crowd out fibre. When you fill your plate with meat, eggs, and protein shakes, there's frequently less room for the vegetables, legumes, and wholegrains that your gut bacteria appear to thrive on.
Research consistently suggests that microbiome diversity appears to be associated with better gut wellness across a range of markers. And microbiome diversity seems to be driven largely by the variety and quantity of plant foods you eat. The 30 plants a week target, which has gained significant traction in gut health research, may be genuinely hard to reach when protein is taking up most of your plate and mental energy.
For women in their late thirties and forties, who may already be experiencing microbiome shifts linked to hormonal changes, a lower-fibre high-protein diet may compound those changes rather than support them. It may be less about the protein itself and more about what it appears to displace.
How You Might Have Both
The goal isn't to abandon protein. Pairing it with more plant diversity may help keep your microbiome supported alongside it. Researchers suggest that:
- legumes, particularly lentils, chickpeas, and beans, appear to offer both protein and fibre, making them potentially useful for gut wellness.
- Eating a wide variety of vegetables, even in small amounts, seems to be associated with greater microbiome diversity than eating large quantities of a single vegetable.
It may also be worth paying attention to how your gut actually appears to respond to different protein sources. Some people seem to tolerate plant protein better than animal protein from a gut wellness perspective. Others find that certain protein shakes appear to be associated with bloating and discomfort in their experience. Individual responses seem to vary considerably, which is exactly where tracking your own gut patterns over time may become genuinely useful.
A gut wellness monitor like Gutsi may help you start to connect the dots between what you're eating and how your gut appears to be responding, so that instead of following the trend and hoping for the best, you may be working with your own data on your gut wellness journey.
Sources
This content is for informational purposes only and does not constitute medical advice. Gutsi is a wellness tracking device and is not intended to diagnose, treat, cure, or prevent any condition. If you have concerns about your digestive health, please speak to a qualified healthcare professional.
