Browse the evidence

Insulin resistance is a key feature of PCOS, but routine clinical measurement of insulin resistance is not recommended due to the inaccuracy of currently available measures.

While insulin resistance is common in PCOS, current clinical tests for it are not accurate enough to guide individual treatment decisions. Focus on lifestyle changes (diet, exercise) which improve insulin sensitivity, rather than seeking specific insulin blood tests.

Activation of PPARγ (via agonists like TZDs or endogenous upregulation) improves insulin resistance and metabolic homeostasis by enhancing adipose tissue expandability, reducing ectopic lipid accumulation, and promoting browning, rather than solely by reducing fat mass.

Focus on improving the health and capacity of your fat tissue rather than just trying to lose weight. Strategies that support healthy adipose tissue function (like those mediated by PPARs, e.g., through specific medications or lifestyle factors that promote adipogenesis and browning) can improve insulin sensitivity even if body weight remains stable or increases slightly. The key is preventing fat from accumulating in organs like the liver and muscles.

PPARα activation promotes fatty acid oxidation and energy expenditure, particularly in the liver and brown adipose tissue, contributing to the treatment of hypertriglyceridemia and obesity-induced insulin resistance.

PPARα activation (e.g., via fibrates) can help manage high triglycerides and improve energy expenditure. This is particularly relevant for those with metabolic syndrome.

PPARβ/δ activation reduces systemic inflammation and promotes fatty acid oxidation in skeletal muscle and brown adipose tissue, offering potential therapeutic benefits for obesity and insulin resistance.

PPARβ/δ activation shows promise for reducing inflammation and improving metabolism in muscle and fat, though it is still under clinical study.

Caloric restriction increases PPARγ expression in inguinal fat, promoting white fat browning, which may mimic some longevity benefits of caloric restriction.

Caloric restriction increases PPARγ in fat, helping it burn more energy (browning). This might be one reason CR helps you live longer and stay healthier.

Soy isoflavones can induce goitrogenic effects in individuals with pre-existing hypothyroidism or iodine deficiency, potentially advancing subclinical hypothyroidism to overt hypothyroidism.

If you have hypothyroidism, consult your doctor before consuming large amounts of soy isoflavones, as they may worsen thyroid function in some cases, especially if iodine intake is adequate.

Gut-derived hormones (CCK, GLP-1, PYY) released by enteroendocrine cells in response to nutrient ingestion activate vagal afferents and hypothalamic centers to inhibit food intake and increase energy expenditure, thereby regulating energy homeostasis.

Your body has a sophisticated biological system that regulates hunger and energy using signals from your gut. When this system is disrupted (as seen in obesity), simple willpower often fails because the biological 'stop' signals (like GLP-1 and CCK) are not functioning correctly. Effective treatments often target these specific pathways (e.g., GLP-1 agonists) to restore the body's natural ability to regulate intake and expenditure.

Repeated administration of CCK leads to desensitization and tolerance, explaining why CCK-derivatives have failed as effective long-term weight-loss treatments.

Early attempts to use CCK mimics for weight loss failed because the body builds tolerance to them. This highlights that simply flooding the system with one satiety signal is not a sustainable long-term strategy without addressing the underlying regulatory mechanisms.

Oxidized phospholipids (oxPLs) can have protective effects, including inhibition of inflammatory signaling and upregulation of antioxidant genes, under certain biological conditions.

Understand that not all oxidation products are harmful; some, like oxPLs, may have protective roles in specific contexts.

Exercise-induced myokines (exerkines) such as SDF1, irisin, and SPARC counteract muscle wasting in diseases like cancer cachexia, COPD, and aging by modulating protein synthesis and degradation pathways.

If you are dealing with muscle loss due to illness or age, regular physical activity is a key treatment. It triggers your muscles to release protective proteins (myokines) that help stop muscle breakdown. You do not need to be an athlete; even moderate aerobic or resistance exercise can help restore these protective factors.

Dietary polyphenols, specifically (-)-epicatechin and olive-derived polyphenols, extend healthspan and lifespan in animal models by enhancing mitochondrial function, reducing oxidative stress, and modulating inflammatory pathways.

Focus on consuming polyphenol-rich whole foods like cocoa, olive oil, berries, and tea as part of a balanced diet. While supplements exist, the evidence for extending human lifespan is strongest when derived from food sources, particularly in older adults or those with metabolic issues. Do not expect immediate results; these are long-term preventive strategies.

Metformin administration is associated with a reduced incidence of multiple age-related diseases and all-cause mortality in both diabetic and non-diabetic populations.

If you are taking metformin for diabetes, you may already be benefiting from reduced risks of age-related conditions. For non-diabetics considering metformin for longevity, the evidence is promising but not yet definitive (TAME trial pending). Discuss with your doctor, especially regarding kidney function and potential side effects like GI distress, which can often be managed with dosing strategies.

Metformin treatment improves outcomes in osteoarthritis (OA) by reducing inflammation, protecting articular cartilage via the AMPK pathway, and reducing body weight.

For those with osteoarthritis, especially if overweight, metformin (if prescribed for diabetes) may offer additional joint protection and pain relief. This is likely due to its anti-inflammatory properties and weight loss effects. Consult your doctor about whether existing metformin therapy is contributing to joint health.

Metformin use is associated with a reduced risk of various cancers, including breast, colorectal, and pancreatic cancer, though effects on pancreatic cancer prognosis are mixed.

If you have diabetes and take metformin, you may have a lower risk of developing certain cancers like breast and colorectal cancer. However, it is not a cancer treatment itself. Do not stop taking metformin to 'prevent' cancer without consulting your doctor, as the benefits for diabetes management are primary.

In obese adolescents, elevated levels of Faecalibacterium prausnitzii and Actinomyces are associated with increased energy recovery from unabsorbed carbohydrates, contributing to obesity phenotypes.

For obese adolescents, gut bacteria play a specific role in extracting energy from food. High levels of Faecalibacterium prausnitzii may mean your body is extracting more calories from carbohydrates than expected. This suggests that dietary strategies focusing on carbohydrate quality and quantity might need to be tailored specifically for adolescents, distinct from adult approaches.

Obese adolescents exhibit distinct metabolic pathway enrichment in their gut microbiota, specifically involving primary bile acid biosynthesis and carbohydrate metabolism (fructose, mannose, galactose), compared to normal weight adolescents.

The gut bacteria of obese adolescents are metabolically active in ways that may promote weight gain, specifically by breaking down sugars and producing primary bile acids. This suggests that dietary interventions for adolescents should consider not just total calories, but the specific types of carbohydrates and fats that feed these bacterial pathways.

Higher circulating levels of phospholipid metabolites, specifically choline, glycerophosphoethanolamine, and glycerophosphorylcholine (GPC), are associated with an insulin-sensitive phenotype in obese individuals, distinguishing them from obese insulin-resistant individuals.

This research suggests that for obese individuals, metabolic health (specifically insulin sensitivity) can be distinguished by blood levels of choline and related phospholipids. Higher levels of these metabolites are linked to a protective, insulin-sensitive state. This implies that metabolic health is not uniform across all obese individuals and may be assessed through specific biomarkers rather than weight alone.

Increased levels of specific fatty acid metabolites (3-hydroxylaurate, 3-hydroxyoctanoate, 3-hydroxydecanoate, 3-hydroxymyristate) and decreased levels of 1,5-anhydroglucitol (1,5-AG) and dimethylarginine (ADMA+SDMA) are associated with disease progression from insulin resistance to Type 2 Diabetes.

For individuals with obesity and insulin resistance, monitoring specific fatty acid metabolites and 1,5-AG levels may provide early warning signs of progression to Type 2 Diabetes. Decreasing 1,5-AG and increasing certain hydroxy-fatty acids are associated with this progression, suggesting these could be valuable markers for early intervention.

Specific bioactive compounds in the Mediterranean Diet, particularly oleuropein and hydroxytyrosol from extra virgin olive oil, exert anti-inflammatory and epigenetic effects that may prevent neurodegenerative diseases and colorectal cancer.

Ensure your extra virgin olive oil is high quality and unrefined to preserve phenolic compounds like oleuropein. These compounds are linked to anti-inflammatory and potential neuroprotective benefits, though human dosing for specific disease prevention is not yet fully established.

Administration of Meteorin-like protein (METRNL) attenuates lipid-induced inflammation and insulin resistance in skeletal muscle by activating AMPK and PPARδ signaling pathways, leading to increased fatty acid oxidation and reduced pro-inflammatory cytokine expression.

This research suggests that the metabolic benefits of exercise are partly driven by specific proteins (like METRNL) released by muscles, which directly improve insulin sensitivity and reduce inflammation. While this specific protein is not yet a commercial supplement, the finding supports the importance of resistance training and physical activity for managing metabolic health, independent of weight loss or calorie counting.

Flavonoids exert antiobesity effects by modulating lipid metabolism, reducing food intake, and regulating gut microbiota.

Incorporate flavonoid-rich foods (like berries, tea, citrus fruits) into your diet as part of a balanced approach to weight management. While they may offer some benefits, they are not a substitute for a healthy diet and exercise.

SIRT3 suppresses lipogenesis in hepatocytes by downregulating the expression of Stearoyl-CoA desaturase 1 (SCD1).

Reducing the intake of saturated fats and maintaining metabolic health may help regulate SCD1, a key enzyme in fat synthesis. This complements the autophagy mechanism by reducing the load of new fat entering the liver.

Maintaining cytoplasmic and mitochondrial NADPH levels is a critical pro-longevity strategy because NADPH drives the recycling of antioxidants (glutathione and thioredoxin) and declines with age, contributing to oxidative stress and tissue dysfunction.

Focus on supporting your body's natural ability to produce and maintain NADPH, rather than relying solely on over-the-counter antioxidant supplements. Strategies that support NAD+ levels (like exercise or specific dietary patterns that boost NAD+ precursors) may indirectly support NADPH pools, as NADP+ is synthesized from NAD+. The paper suggests that maintaining the balance of these redox couples is more critical for longevity than high-dose antioxidant supplementation alone.

Oral administration of Lactobacillus plantarum strain Ln4 (5x10^8 CFU/day) attenuates diet-induced obesity, reduces epididymal fat mass, and improves insulin resistance in high-fat diet-fed mice.

This study suggests that consuming Lactobacillus plantarum strain Ln4 (500 million CFU daily) may help mitigate weight gain and improve insulin sensitivity in individuals consuming a high-fat diet. However, these results are from mice; human applicability is not yet established. Do not replace standard medical care with probiotics.