Benefits of Butyrate
I must admit that I love butyrate, which is why I recommended it as an important over-the-counter supplement in The Redox Promise. Why do I think so highly of this compound? First, it’s a naturally occurring SCFA that is produced in the colon by resident gut bacteria—typically through the fermentation of dietary fiber. The synthesis by intestinal bacteria occurs via four pathways: nondigestible carbohydrates (like fiber), succinate, L-lysate, and glutarate. It is then taken up and metabolized by the colonic epithelial cells, after which low levels of butyrate enter the liver and regulate fatty acid metabolism.
This naturally occurring postbiotic is an integral source of energy for colonocytes, the cells lining the colon, to maintain the integrity of the intestinal barrier and prevent conditions like leaky gut. Butyrate also exerts strong anti-inflammatory effects by inhibiting histone deacetylases (HDACs), which regulate gene expression involved in immune responses and thereby reduce inflammation. Additionally, butyrate prompts the growth of beneficial bacteria. Relevant to our purposes here, butyrate has also been shown to improve insulin sensitivity.
The Mechanisms Behind Butyrate
At its core, butyrate provides energy to serve as a foundation for maintaining healthy gut microbiota. It also possesses a remarkable ability to combat inflammation and oxidative stress by promoting the development of T cells and therefore supporting the immune response. Indeed, research shows that ingesting butyrate will help defend against conditions such as inflammatory bowel disease (IBD) and leaky gut syndrome and ensure healthy bowel movements. All of these factors position butyrate to protect the health of our microbiome, helping its diversity and therefore keeping it in homeostasis—which directly affects the body’s ability to stay in redox balance and prevent chronic inflammation and resulting insulin resistance.
Butyrate’s anti-inflammatory properties and support of redox happens via its activation of the NRF2 pathway, inhibition of the NF-κB pathway, and impact on histone acetylation regulation. We know that a healthy microbiome not only helps regulate genes but also modulates cytokine production, making it instrumental in immune modulation. By reducing levels of inflammatory cytokines such as TNF-α and IL-6 while increasing anti-inflammatory agents such as IL-10 and TGF-β, butyrate helps maintain a delicate balance in the body’s inflammatory response. Further, its ability to inhibit HDAC leads to changes in histone acetylation that activate genes associated with reducing inflammation.
Butyrate is a by-product of intestinal bacteria that is produced by the breakdown of nondigestible carbohydrates like fiber, succinate, L-lysate, and glutarate. Low levels of butyrate enter the liver and regulate fatty acid metabolism.
Butyrate and the Microbiome
The health of the microbiome is tied inextricably to its ability to produce butyrate—this is another reason I recommend a high-fiber diet that emphasizes vegetables. When you eat more fiber, you turn on two mechanisms. First, fiber alone produces more GLP-1; second, fiber also produces butyrate, which in turn produces more GLP-1. I have all of my patients taking GLP-1 RAs supplemented with butyrate. This duo of fiber and butyrate works synergistically to help with weight loss and appetite regulation. Additionally, butyrate interacts with the enzyme AMP-activated protein kinase (AMPK), which further helps fat metabolism and enzyme aids to increase the burning and decrease the storage of fats. In particular, studies have shown that as an SCFA, butyrate activates brown adipose tissue (BAT) and increases energy expenditure. Further, studies have shown that oral administration of butyrate activates the gut–brain neural circuit via the vagus nerve, allowing for the transmission of signals from the gut to the brain and resulting in reduced food intake and appetite suppression.
Recent research has also shown that certain fibrous foods that evade digestion in the intestine are instead fermented by gut bacteria and boost butyrate levels. Similarly effective are inulin and fructooligosaccharides (FOS), which are types of fructans that undergo fermentation in the intestine. Pectin, found in fruits and vegetables, along with beta-glucans, found in grains such as oats and barley, have also been proven to promote butyrate production.
Further Benefits of Butyrate
New research suggests that butyrate may improve mood and lessen symptoms of depression and anxiety. Its influence on the connection between the gut and the brain (known as the gut–brain axis), regulation of factors such as brain-derived neurotrophic factor (BDNF), and anti-inflammatory actions highlight its potential role as a therapeutic agent for emotion regulation. Butyrate also activates the mTOR pathway and stimulates the secretion of growth hormone, preventing muscle breakdown and enhancing muscle mass and strength. This makes it a valuable ally for athletes and those who exercise regularly. And given its anti-inflammatory properties, butyrate can improve performance and speed up recovery.
Recent research also suggests that butyrate has the potential to fight colorectal cancer by inhibiting the growth of colon cancer cells through inducing cell death, blocking cell multiplication, and suppressing blood vessel formation. Additionally, its influence on gut bacteria balance and its ability to inhibit HDACs work against this type of cancer. These enzymes remove acetyl groups from histones, which condenses chromatin and represses transcription; regulate the acetylation of non-histone proteins and cytoplasmic proteins; and play a role in the survival of retinal neurons and the osteogenic differentiation of dental-derived cells.
From: The Redox Promise