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review · Gut Microbes

How important are fatty acids in human health and can they be used in treating diseases?

202464 citationsOpen accessStellenbosch University

In plain language

Short-chain fatty acids produced by gut bacteria, including butyrate, provide energy to intestinal cells, strengthen tissue barriers, and inhibit histone deacetylase. They are linked to improvements in brain trauma, dementia, autoimmune encephalitis, and intestinal disorders, while deficiencies correspond to cardiovascular diseases, hypertension, stroke, obesity, and diabetes. Monounsaturated fatty acids such as cis-palmitoleic acid enhance insulin sensitivity, reduce cardiovascular risks, and suppress inflammatory cytokines. Dietary polyunsaturated fatty acids also regulate inflammation. Their enzymatic conversion yields anti-inflammatory prostaglandins and leukotrienes, although the oxidation of linoleic acid generates compounds that induce inflammation. Furthermore, omega-3 fatty acids, specifically eicosapentaenoic acid and docosahexaenoic acid, lower triglyceride levels and reduce the risks associated with certain cancers, Alzheimer's disease, and dementia. Overall, these distinct fatty acid classes play diverse physiological roles and offer pathways for disease treatment.

Key takeaways

  • Gut-derived short-chain fatty acids like butyrate support intestinal health, inhibit histone deacetylase, and correlate with recovery from brain trauma and autoimmune disorders.
  • Deficiencies in short-chain fatty acids are associated with chronic conditions including hypertension, cardiovascular disease, stroke, obesity, and diabetes.
  • Monounsaturated palmitoleic acid reduces pro-inflammatory cytokine expression, increases insulin sensitivity, and lowers cardiovascular risks.
  • Dietary omega-3 fatty acids such as EPA and DHA lower triglycerides and reduce the risk of certain cancers, dementia, and Alzheimer's disease.

Why it matters

Fatty acids are central to human health, influencing inflammation, metabolism, and organ function. Understanding how short-chain, monounsaturated, and polyunsaturated fatty acids operate helps clarify the mechanisms connecting diet, gut microbiomes, and systemic diseases. This knowledge highlights the potential of targeting specific fatty acid pathways to manage widespread health conditions such as cardiovascular disease, diabetes, and neurodegenerative disorders.

Commercialisation angle

The abstract outlines therapeutic and preventative potentials of various fatty acids in managing cardiovascular, metabolic, and neurodegenerative disorders, but it represents early-stage review research without detailing specific drug formulations, clinical delivery methods, or ready commercial products. Practical application would require clinical developers and nutritional companies to validate therapeutic dosages, formulate stable delivery mechanisms, and conduct human trials to translate these biochemical associations into verified treatments or dietary interventions.

AI-generated from the published abstract. Always read the original work before citing.

Abstract

Most of the short-chain fatty acids (SCFAs) are produced by <i>Bifidobacterium</i>, <i>Lactobacillus</i>, Lachnospiraceae, <i>Blautia</i>, <i>Coprococcus</i>, <i>Roseburia</i>, <i>Facealibacterium</i> and <i>Oscillospira</i>. Butyrate (C<sub>4</sub>H<sub>7</sub>O<sub>2</sub><sup>-</sup>) supplies 70% of energy to intestinal epithelial cells (IECs), supports tight-junction protein formation, induces the production of inflammatory cytokines, and inhibits histone deacetylase (HDAC). Butyrate is also associated with the recovery of brain trauma, improvement of dementia, the alleviation of autoimmune encephalitis, and several intestinal disorders. Low levels of SCFAs are associated with hypertension, cardiovascular disease (CVD), strokes, obesity, and diabetes mellitus. <i>Cis-</i>palmitoleic acid (C<sub>16</sub>H<sub>30</sub>O<sub>2</sub>), a mono-unsaturated fatty acid (MUFA), increases insulin sensitivity and reduces the risk of developing CVD. Lipokine palmitoleic acid reduces the expression of pro-inflammatory cytokines IL-1β (pro-IL1β), tumor necrosis factor α (TNF-α), and isoleucine 6 (IL-6). Polyunsaturated fatty acids (PUFAs), such as omega-3 and omega-6, are supplied through the diet. The conversion of PUFAs by cyclooxygenases (COX) and lipoxygenases (LOX) leads to the production of anti-inflammatory prostaglandins and leukotrienes. Oxidation of linoleic acid (LA, C<sub>18</sub>H<sub>32</sub>O<sub>2</sub>), an omega-6 essential fatty acid, leads to the formation of 13-hydroperoxy octadecadienoic acid (13-HPODE, C<sub>18</sub>H<sub>32</sub>O<sub>4</sub>), which induces pro-inflammatory cytokines. Omega-3 PUFAs, such as eicosapentaenoic acid (EPA, C<sub>20</sub>H<sub>30</sub>O<sub>2</sub>) and docosahexaenoic acid (DHA, C<sub>22</sub>H<sub>32</sub>O<sub>2</sub>), lower triglyceride levels, lower the risk of developing some sort of cancers, Alzheimer's disease and dementia. In this review, the importance of SCFAs, MUFAs, PUFAs, and saturated fatty acids (SFAs) on human health is discussed. The use of fatty acids in the treatment of diseases is investigated.

Research topics

  • Fatty Acid Research and Health
  • Diet and metabolism studies
  • Gut microbiota and health

Sustainable Development Goals

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DOI: 10.1080/19490976.2024.2420765

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