Browse the evidence

Exposure to specific endocrine-disrupting chemicals (e.g., phthalates, BPA, vinclozolin) is associated with an increased risk of Testicular Dysgenesis Syndrome (TDS) and reduced male fertility.

For men concerned about fertility, minimizing exposure to known endocrine disruptors like phthalates and BPA (found in some plastics and receipts) is advisable, especially if planning a family. This is particularly relevant for those with a history of reproductive issues, as early developmental exposure may have lasting effects.

Osteocalcin regulates bone mineralization by inhibiting hydroxyapatite crystal growth and nucleation, although its absence leads to smaller, less perfect crystals rather than a total failure of mineralization.

Osteocalcin helps ensure your bone crystals are strong and well-formed. While you can't supplement osteocalcin directly, ensuring adequate Vitamin K and Calcium intake supports the production of functional osteocalcin, which contributes to bone quality.

Mitochondrial overload of fatty acid oxidation in muscle, characterized by incomplete oxidation and accumulation of acylcarnitines, causes insulin resistance by depleting TCA cycle intermediates and inducing mitochondrial stress, rather than solely by the accumulation of diacylglycerols and ceramides.

When consuming high-fat diets, the body's ability to burn fat in muscle mitochondria can become overwhelmed, leading to metabolic stress and insulin resistance. This suggests that managing lipid flux and supporting mitochondrial health (e.g., through exercise which normalizes acylcarnitines) is crucial, rather than just avoiding fat entirely.

Administration of Akkermansia muciniphila improves glucose metabolism and reduces fasting hyperglycemia in type 2 diabetic mouse models by decreasing gluconeogenesis.

Current research shows the bacterium Akkermansia muciniphila improves blood sugar control in diabetic mice, but it is not yet a confirmed or available probiotic treatment for humans.

Mitochondrial fusion is associated with increased longevity and improved metabolic efficiency, whereas unopposed fission (fragmentation) is linked to oxidative stress, reduced ATP production, and accelerated aging phenotypes.

Maintaining mitochondrial health involves supporting the dynamic balance of fusion and fission rather than simply maximizing one process. While specific supplements or exercises are not detailed in this mechanism paper, the evidence suggests that conditions promoting mitochondrial fusion (like moderate caloric restriction or specific genetic pathways) are linked to longevity in model organisms. Focus on general metabolic health markers rather than targeting single mitochondrial proteins in isolation.

Mitophagy, the selective degradation of damaged mitochondria, is a critical quality control mechanism that promotes longevity in model organisms, and its decline contributes to the accumulation of dysfunctional mitochondria in aging.

Supporting mitochondrial quality control through healthy lifestyle habits (like exercise and caloric restriction) may naturally enhance mitophagy, as seen in model organisms. However, since this paper is a mechanism review, specific dosages or supplements for humans are not provided. Focus on maintaining overall metabolic health to support these natural quality control processes.

Smoking cessation during lockdown was observed in 3.3% of smokers, potentially driven by fear of COVID-19 respiratory complications.

For smokers, the heightened awareness of respiratory health risks during the pandemic may serve as a powerful motivator to quit. Leverage this awareness to support cessation efforts.

Visfatin (Nampt) promotes cancer cell survival and migration through inflammatory, metabolic, and antioxidant pathways, particularly in colorectal and ovarian cancers.

Visfatin is a molecule that increases with obesity and can promote cancer cell survival and spread, especially in colorectal and ovarian cancers. Reducing obesity may help lower visfatin levels, potentially slowing cancer progression.

Tocotrienols show promise in managing diabetes and hyperlipidemia by reducing blood glucose, improving insulin sensitivity, and lowering lipid levels in animal models.

While animal studies show tocotrienols can improve blood sugar control and lipid profiles, human evidence is not yet robust enough to recommend them as a primary treatment for diabetes. Consult a doctor before using them for metabolic management.

Rapid Eye Movement (REM) Sleep Behavioural Disorder (RBD), Apnoea, and Long Time in Bed (TIB) are associated with a higher risk of cognitive disorders.

If you have been diagnosed with REM Sleep Behavioural Disorder (RBD), sleep apnoea, or consistently spend excessive time in bed (TIB) without sleeping, these are linked to a higher risk of cognitive decline. Seek medical evaluation and treatment for these conditions as part of your long-term brain health strategy.

FMT shows promise in treating Inflammatory Bowel Disease (IBD), including Ulcerative Colitis (UC) and Crohn's Disease (CD), but efficacy is lower and more variable than in CDI, with clinical remission rates around 36-45% in systematic reviews.

For those with Ulcerative Colitis or Crohn's Disease who haven't responded well to standard treatments, FMT might be an option. While not as consistently effective as for C. diff, some patients do achieve remission, especially younger individuals. It requires careful consideration of the risks and benefits, and multiple treatments may be needed.

Dietary capsaicin (0.01%) prevents diet-induced obesity in wild-type mice by activating TRPV1 channels, which triggers intracellular calcium elevation and subsequent phosphorylation of CaMKII and AMPK, leading to SIRT-1 activation, PPARγ deacetylation, and the browning of white adipose tissue (WAT).

This research suggests that adding a small amount of capsaicin (0.01% of diet) to a high-fat diet can prevent obesity in mice by turning white fat into energy-burning brown fat. This happens through a specific chain reaction starting with TRPV1 activation. For humans, this implies that spicy foods might support metabolic health, but the dose required in the study is specific and the sensory experience is intense. It does not mean you can eat unlimited fat; it means capsaicin may help mitigate some effects of a poor diet by increasing energy expenditure.

Resistance training leads to structural brain changes, specifically lower white matter atrophy and smaller white matter lesion volumes.

Regular resistance training helps preserve the brain's structural integrity by reducing white matter atrophy and lesion volumes, which supports long-term cognitive health.

Inhibition of SIRT4 in liver and muscle cells increases fatty acid oxidation and mitochondrial gene expression, primarily through the upregulation of SIRT1 and activation of AMPK.

This research suggests that reducing SIRT4 activity could help the liver and muscles burn more fat. This mechanism is currently being explored for potential treatments for type 2 diabetes and conditions involving ectopic fat storage, but no direct human intervention is available yet.

Chronic low-dose aspartame consumption impairs insulin-stimulated glucose disposal and elevates fasting glucose in diet-induced obese rats, independent of changes in body composition.

Even at low doses, chronic aspartame consumption may worsen blood sugar control and insulin sensitivity, regardless of weight loss. If you are managing diabetes or insulin resistance, consider reducing or eliminating aspartame, as it may be contributing to your metabolic issues through gut microbiome changes.

Low-dose aspartame consumption increases serum propionate levels, which may drive hepatic gluconeogenesis and impair insulin tolerance.

Aspartame may increase propionate, a gut-derived metabolite that can raise blood sugar. This suggests that avoiding aspartame might help manage blood sugar levels, especially if you have insulin resistance.

Serum Anti-Mullerian Hormone (AMH) can be used as an alternative to ultrasound for defining Polycystic Ovarian Morphology (PCOM) in adults, but should not be used as a single test or in adolescents.

In adults, AMH blood tests can help confirm PCOS if ultrasound isn't possible or preferred, but it is never used alone. It is not recommended for adolescents. Discuss with your doctor if it fits your diagnostic pathway.

Dietary intake of polyphenols (specifically curcumin from turmeric) reduces neuroinflammation and oxidative stress, thereby supporting neuroplasticity and cognitive function in aging.

Incorporate turmeric (curcumin) into your diet. While bioavailability is a challenge, studies suggest that regular consumption of curry (containing turmeric) is associated with better cognitive scores in elderly populations. For supplements, look for formulations designed to enhance absorption.

Brown adipose tissue (BAT) and beige/brite adipocytes within white adipose tissue (WAT) are metabolically active depots that can correct WAT pathologies and improve whole-body insulin sensitivity through thermogenesis mediated by UCP1.

You likely have metabolically active brown fat, even as an adult. While you can't 'eat' brown fat, you can potentially activate it through cold exposure or exercise, which may improve insulin sensitivity. This is a biological lever for metabolic health, distinct from simple calorie restriction.

Beige/brite adipocytes, found interspersed in white adipose tissue, can be recruited and transformed into a brown fat-like phenotype through mechanisms involving PRDM16, beta-3-adrenergic stimulation, and cold exposure.

Your white fat contains 'beige' cells that can be activated by cold. This process, mediated by PRDM16, turns fat into a heat-producing tissue, potentially improving metabolic health.

Roux-en-Y gastric bypass (RYGB) induces a progressive, adaptive rise in postprandial satiety hormones (PYY, GLP-1, enteroglucagon) and suppresses the compensatory rise in ghrelin, which explains the sustained weight loss and altered satiety without the typical counter-regulatory increase in appetite.

For individuals with morbid obesity, standard diet and exercise often fail long-term because the body increases hunger hormones (like ghrelin) to defend its higher weight. Roux-en-Y gastric bypass physically alters the gut to produce more satiety hormones (PYY, GLP-1) and suppresses hunger signals. This hormonal shift explains why patients feel fuller faster and stay full longer, leading to sustained weight loss without the typical rebound hunger seen in dieting. It is a physiological reset, not just a restriction.

High-protein diets (defined as >1.2 g/kg/day) cause intraglomerular hypertension and hyperfiltration, which may lead to kidney damage, proteinuria, and accelerated decline in eGFR, particularly in individuals with pre-existing chronic kidney disease (CKD) or risk factors.

If you are eating more than 1.2 grams of protein per kilogram of body weight daily, especially from animal sources, and you have any history of kidney issues, diabetes, or high blood pressure, you should monitor your kidney function (eGFR) regularly. Consider shifting some protein intake to plant sources to reduce acid load and phosphate burden, which may protect kidney health.

The ketogenic diet, by emphasizing high protein (1.2-2.0 g/kg) and high fat while excluding fruits/vegetables, may increase the risk of kidney stones, metabolic acidosis, and albuminuria due to high dietary acid load and lack of alkali precursors.

If you follow a ketogenic diet and have a history of kidney stones or kidney disease, be aware that the high acid load from animal proteins and lack of fruits/vegetables may increase your risk of stone formation and metabolic acidosis. Monitor your health and consider incorporating low-carb vegetables to balance acid load.

High adherence to the Mediterranean diet is associated with higher defecation frequency and more pronounced gastrointestinal symptomatology (pain, bloating) compared to low adherence.

If you increase your adherence to a Mediterranean diet, expect your bowel movements to become more frequent. However, be prepared for a potential increase in gastrointestinal symptoms, specifically abdominal pain and bloating, which were significantly higher in high-adherence groups in this study.