Fibre vs Protein - What your gut health is really missing.
Fibre is finally getting the PR it deserves and its about time!
Most of the time we hear about how protein is on a pedestal and don’t get me wrong, protein is great and the claims about it are right! Protein is essential. It provides the building blocks for muscle tissue, enzymes, immune cells, neurotransmitters, and repair. Without adequate protein, healing is difficult and our resilience fades.
But you can meet your protein goals perfectly and still struggle with issues like constipation, bloating, unstable energy, hormonal symptoms, and chronic inflammation. This is because while protein is structural, fibre is regulatory. And without regulation, structure alone does not create overall health.
So protein may build the body but fibre helps to build and manage the environment in which that body functions. This is because inside your digestive tract lives an ecosystem of microorganisms that influence nearly every system in your body and these microbes thrive off of fibre and not protein.
When you consume fibre, certain bacteria in our digestive tract ferment it and produce short-chain fatty acids, including butyrate. Butyrate is one of the most important compounds for maintaining the integrity of the gut lining, reducing inflammation, supporting immune balance, and protecting the cells in our colon. This acts as fuel for those cells and play a huge role in maintaining that strong barrier that we want between our internal system and the outside world.
When fibre intake is consistently low, microbial diversity tends to decline because it doesn't have enough food to eat for it to survive. A less diverse microbiome is associated with increased inflammation, impaired immune signaling, metabolic instability, and even mood dysregulation.
When we compare this with protein intake, this means someone can be consuming enough protein for muscle repair while simultaneously starving their healthy microbial ecosystem that helps with inflammation, immunity, and metabolic rhythm. One does not supersede the other.
Blood sugar regulation is another area where fibre’s influence is often underestimated. When carbohydrates are consumed without adequate fibre, glucose enters the bloodstream quickly. Rapid spikes are often followed by rapid drops, which can trigger cravings, irritability, fatigue, and increased cortisol output. Fibre slows gastric emptying and moderates how quickly glucose is absorbed. The result is a steadier energy curve and there is less stress placed on the adrenal system.
For people who struggle with things like anxiety, burnout, or adrenal fatigue, stable blood sugar eating adequate fibre and protein together becomes one of the simplest and most foundational tools for creating that stability.
Then there are bowel movements (you can't expect to read something about fibre and not hear about this). When it comes to talking about the cornerstone for gut health, detoxification and hormonal balance, steady bowel movements are right at the top. Fibre adds bulk to stool, supports healthy transit time, and helps prevent stagnation in the colon.
When our transit slows, waste products, toxins, and metabolized hormones remain in contact with the intestinal lining for longer periods, increasing the likelihood of reabsorption. Protein metabolism produces waste that must be eliminated efficiently. Without fibre supporting motility, that process becomes sluggish.
This is how fibre plays a profound role in hormone regulation, in particular, estrogen metabolism. After estrogen has done its job in the body, it is processed by the liver and sent into the digestive tract for elimination. Here fibre binds to excess estrogen in the stool and helps carry it out of the body. When we don't have enough fibre intake, some of that estrogen can be reabsorbed back into circulation. This is where there can be contributing factors to things like heavy periods, breast tenderness, acne, and other pms symptoms.
However all fibre is not created the same. There are soluble fibres that form a gel-like consistency and help regulate blood sugar and cholesterol. Then there are insoluble fibres that provide structural bulk and support movement through the digestive tract.
For soluble fibres think of foods like : Avocado, bananas, beets, carrots, chia, cucumbers, mango, mushrooms, oats, squash and zucchini (to name a few).
Insoluble fibre would be foods like : seeds, beans, nuts, kale, lentils, berries, peas, potatoes, (apples with skin) broccoli, and spinach(to name a few).
If someone is already experiencing severe bloating, inflammation, or chronic constipation, simply adding large amounts of fibre can actually make things worse. For people who are already dealing with digestive concerns, increasing fibre must be done thoughtfully. Fibre requires adequate hydration, sufficient stomach acid, and motility to be tolerated well without creating additional issues. Increasing fibre gradually, focusing on cooked (compared to raw) and easier-to-digest plant foods, while addressing underlying digestive issues first often leads to better long-term outcomes than upping your fibre rapidly overnight.
Give fibre some love.
