Protein is one of the most widely discussed and debated topics in nutrition. Questions about how much to eat, the best sources, and the optimal timing for consumption all spark endless conversations, making it a topic of ongoing fascination and exploration.
And I’m about to add another element to consider.
Which type of protein - animal vs plant - is better for your gut microbiome?
Before we dive into that, let’s clarify what exactly protein is and does (and no, it’s not only needed to build muscle). Protein is a fundamental macronutrient composed of amino acids, often referred to as the building blocks of life. It plays a critical role in nearly every biological process in the body. Structurally, proteins are responsible for building and repairing tissues, including muscles, skin, hair, and internal organs. Functionally, they are essential for the production of enzymes and hormones, which regulate various metabolic processes and support the body's chemical reactions.
Beyond its physical functions, protein influences overall health by contributing to satiety and helping to stabilise blood sugar levels, making it crucial for weight management and metabolic health. Whether derived from plant or animal sources, protein is essential for growth, repair, and maintaining balance in the body.
Okay, so now that we know that protein is an essential element in everyone’s diet, let’s get into which protein source is best for your gut microbiome.
When it comes to gut health, the type of protein you consume matters. The relationship between dietary protein and gut health is a growing area of interest, particularly as researchers and experts like Simon Hill and Dr. Will Bulsiewicz emphasise the benefits of plant-based diets or diets focused primarily on protein from plant sources.
Plant-Based Proteins: A gut-loving option
Plant-based proteins, found in foods like lentils, chickpeas, quinoa, nuts, seeds, and tofu, provide more than just amino acids - they are rich in fiber and phytochemicals that promote a diverse and balanced gut microbiome. Fiber from plant-based proteins acts as a prebiotic, fueling the growth of beneficial bacteria like Bifidobacteria and Lactobacillus. This microbial diversity is associated with improved digestion, reduced inflammation, and better overall health.
Simon Hill, author of The Proof is in the Plants, often highlights how plant proteins "come packaged with fiber and polyphenols, which are essential for feeding our gut microbiota and creating a healthy, anti-inflammatory environment in the gut."
Fermented Proteins: Double the benefit
Fermented plant-based proteins, such as tempeh or miso, take gut health benefits a step further by introducing probiotics into the diet. Probiotics are live bacteria that enhance gut function and help maintain the integrity of the gut lining. Including these in your diet supports microbial diversity while reducing gut-related issues like bloating and irregularity.
Dr. Will Bulsiewicz, gastroenterologist and author of Fiber Fueled, states, "Plant-based foods not only supply the protein we need but also contribute to the diversity of our microbiome, which is key to a healthy gut. Fermented foods are especially powerful because they bring live bacteria and help rebuild a damaged gut."
Animal Proteins: It’s about balance
While animal proteins like chicken, fish, and eggs can be part of a healthy diet, the key is moderation. And even more so when it comes to red meats and processed meats.
Excessive consumption of red and processed meats has been linked to imbalances in gut bacteria, leading to the production of inflammatory compounds such as trimethylamine N-oxide (TMAO). TMAO is produced when gut bacteria metabolize nutrients like L-carnitine, abundant in red meat. Elevated TMAO levels have been associated with an increased risk of cardiovascular diseases.
A study published in the European Heart Journal found that chronic consumption of red meat increases systemic TMAO levels through enhanced dietary precursors and increased microbial production from carnitine. The study also noted that discontinuing red meat intake reduced plasma TMAO levels within four weeks.
These findings suggest that high intake of red and processed meats can disrupt gut microbiota balance, leading to increased production of TMAO and potentially elevating the risk of inflammatory conditions and cardiovascular diseases.
Dr. Bulsiewicz explains, "Animal-based diets that lack fiber can starve the gut microbiome, reducing microbial diversity and contributing to the overgrowth of pro-inflammatory bacteria. On the other hand, lean animal proteins in moderation can complement a gut-friendly, fiber-rich diet."
Recommendations for a gut-healthy protein intake:
To optimise gut health, focus on:
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Variety: Incorporate a range of plant-based proteins such as beans, lentils, nuts, seeds, and whole grains.
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Fermented Foods: Add tempeh, miso, and other fermented protein sources for probiotics.
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Animal Protein in Moderation: Choose lean options like fish and poultry, and limit red and processed meats.
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Fiber-Rich Foods: Pair proteins with high-fiber vegetables and grains to feed beneficial gut bacteria.
By focusing on plant-based and fermented proteins while reducing your intake of animal protein, you can support a robust and healthy gut microbiome. And we all know that a healthy and happy gut microbiome is key to overall health and wellness.