Browse the evidence

Activation of the kynurenine pathway via IDO/TDO enzymes during inflammation promotes immune tolerance and prevents hyperinflammation by depleting tryptophan and producing kynurenine, which activates the aryl hydrocarbon receptor (AhR) to drive regulatory T cell differentiation.

This paper highlights that the body's natural response to stress (inflammation) involves shifting tryptophan metabolism to protect against excessive immune damage. While not a direct supplement protocol, it suggests that maintaining healthy tryptophan metabolism and understanding the balance of immune response is crucial for aging. Future therapies might target this pathway, but currently, no specific dose is recommended for general use.

Sirtuins (SIRTs) are potential therapeutic targets for NAFLD treatment, with SIRT1 playing a key role in regulating lipid metabolism and autophagy.

Sirtuins are being studied as potential drug targets for NAFLD, but no specific sirtuin-activating supplements or drugs are currently recommended for treatment.

Maternal 1-hour glucose levels during pregnancy are specifically associated with an increased risk of childhood prehypertension or hypertension, independent of other glucose measures.

If a mother has a high 1-hour glucose level during her pregnancy, her child may be at a higher risk for high blood pressure in childhood. This highlights the importance of monitoring blood pressure in children born to mothers with elevated 1-hour glucose levels, even if their fasting glucose was normal.

Exposure to environmental endocrine-disrupting chemicals (EDCs) such as BPA, phthalates, and persistent organic pollutants acts as an obesogen, contributing to obesity, metabolic syndrome, and type 2 diabetes by disrupting endocrine pathways, adipogenesis, and gut microbiota.

Reduce exposure to known endocrine disruptors by avoiding heating food in plastic containers, choosing glass or stainless steel for water storage, and filtering drinking water. Be aware that these chemicals are ubiquitous in plastics, pesticides, and personal care products, and early-life exposure may have long-term metabolic consequences.

Exposure to environmental endocrine-disrupting chemicals (EDCs) is associated with adverse reproductive health outcomes in both males and females, including reduced fertility, altered puberty timing, and increased risk of conditions like PCOS and endometriosis.

Minimize exposure to EDCs by avoiding plastic food containers, especially when heating food, and choosing personal care products free of phthalates and parabens. This is particularly important for those planning pregnancy or currently pregnant.

Chronic treatment with the beta-3 adrenergic receptor agonist mirabegron increases brown adipose tissue (BAT) metabolic activity and volume in healthy women without altering body weight.

This study suggests that the bladder medication Mirabegron, when taken chronically at a dose higher than standard (100mg vs 50mg), can activate brown fat and increase its volume in healthy women without causing weight gain. However, because the study was small, open-label, and lacked a placebo, these results should be viewed as preliminary evidence that beta-3 stimulation is a viable pathway for metabolic health, pending larger controlled trials.

Chronic mirabegron treatment improves insulin sensitivity, glucose effectiveness, and pancreatic beta-cell function in healthy women.

Mirabegron, taken at 100mg daily for 4 weeks, significantly improved insulin sensitivity and glucose handling in healthy women. This suggests beta-3 stimulation is a potent lever for metabolic health, though the high dose used here caused mild cardiovascular side effects, suggesting future drugs need better selectivity.

Chronic mirabegron treatment increases plasma levels of HDL cholesterol, ApoA1, and bile acids, independent of weight loss.

Mirabegron treatment improved favorable lipid markers (HDL, ApoA1) and bile acids. This may be a downstream effect of increased brown fat activity consuming lipoproteins. This benefit occurred without weight loss.

Gut microbiota dysbiosis in women with Polycystic Ovary Syndrome (PCOS) is significantly associated with clinical phenotypes, including elevated testosterone, increased waist circumference, and altered brain-gut peptides (serotonin, ghrelin, PYY).

This research suggests that the gut health of women with PCOS differs from controls, specifically showing lower levels of beneficial bacteria (like Akkermansia) and higher levels of potentially inflammatory bacteria (like Escherichia/Shigella). These microbial differences are linked to higher testosterone and waist circumference. While this study does not prescribe a specific diet, it supports the investigation of dietary interventions aimed at improving gut microbiota diversity as a potential strategy to manage PCOS symptoms.

High-fructose diets promote visceral adipose tissue accumulation and insulin resistance, which indirectly drives intrahepatic lipid accumulation by increasing the flux of free fatty acids from adipose tissue to the liver.

Fructose may contribute to belly fat (visceral adiposity) more than glucose in some studies. This belly fat releases fatty acids into the liver, worsening fatty liver. This is an indirect effect. Managing overall weight and insulin sensitivity is key to reducing this flux.

Soy Protein Isolate (SPI) and purified soy isoflavones (genistein, daidzein) exhibit weak estrogenic activity that may pose risks for reproductive health, early development, and estrogen-sensitive cancers, despite conflicting evidence from some human studies.

If you are taking soy protein isolate or purified soy isoflavone supplements (not just eating tofu/edamame), be aware they have weak estrogenic effects. Women with a history of endometriosis or estrogen-sensitive cancers should consult a doctor before using these supplements, as they may increase risk. Infants should generally be fed cow milk formula unless soy is medically indicated.

ATF3 acts as a master regulator of metabolic homeostasis and oncogenesis, functioning as a context-dependent hub that can either suppress or promote disease states depending on tissue type and cellular stress.

This paper identifies ATF3 as a critical biological switch in metabolism and cancer. While not a direct intervention for humans yet, it suggests that therapies targeting ATF3 induction (like ST32da) or inhibition could treat metabolic disorders and cancers. Current research focuses on how stress signals trigger ATF3 to regulate glucose and fat storage.

ATF3 plays a dual role in prostate cancer, acting as a tumor suppressor by inhibiting androgen signaling and AKT, but also as an oncogene by promoting cell proliferation and metastasis via SUMOylation.

ATF3's role in prostate cancer is complex. It can suppress tumors by blocking androgen signals but can also promote cancer if modified by SUMOylation. This complexity makes it a challenging but potentially valuable target for therapy.

Rapamycin inhibits the Stat3 pathway, which may explain its ability to suppress SASP independently of Nrf2.

Rapamycin may reduce inflammation in aging cells by turning off the Stat3 signal, even if the cell's main antioxidant system (Nrf2) is broken.

Type 2 diabetes is associated with an increased risk of specific cancers, including endometrial, colorectal, breast, pancreatic, liver, and kidney cancers, while being associated with a decreased risk of prostate cancer.

If you have Type 2 diabetes, be aware that your risk for certain cancers (like breast, colorectal, and pancreatic) is higher, while your risk for prostate cancer may be lower. Regular screening appropriate for your age and gender is crucial.

Metformin use in patients with diabetes is associated with a reduced risk of cancer and cancer-specific mortality, although methodological biases in early studies may have inflated these estimates.

If you take Metformin for diabetes, you may benefit from a potential reduction in cancer risk, although this is not yet definitively proven. Continue taking it as prescribed for your diabetes management.

Higher doses (10-15 mg) of the dual GIP/GLP-1 receptor agonist tirzepatide significantly improve specific nonalcoholic steatohepatitis (NASH) biomarkers, including reducing hepatocyte apoptosis (K-18) and fibrosis (Pro-C3), and increasing anti-fibrogenic adiponectin, in patients with type 2 diabetes.

If you have Type 2 Diabetes, higher doses of tirzepatide (10-15 mg weekly) have been shown to improve blood markers associated with liver inflammation and scarring (NASH) compared to placebo. However, this is based on blood tests, not liver biopsies, so it indicates reduced liver stress rather than a confirmed cure for liver disease. Consult your doctor to see if this medication is appropriate for your metabolic health.

Metformin is a common pharmacological insulin sensitization therapy used to treat PCOS, though specific dosing protocols are not detailed in this review excerpt.

Metformin is a standard medication for treating insulin resistance in PCOS. Consult a doctor for appropriate dosing and monitoring.

Ketone bodies (specifically beta-hydroxybutyrate) act as signaling molecules that inhibit histone deacetylases (HDACs) and promote histone acetylation, thereby altering gene expression to support anti-oxidant and anti-inflammatory pathways.

This is a deep molecular mechanism. Practically, it means that the ketone bodies your body makes on a low-carb diet are actively turning on genes that protect your cells from aging and damage.

Exposure to endocrine-disrupting chemicals (EDCs) during early development can alter adipose tissue homeostasis and energy regulation, predisposing individuals to obesity and metabolic syndrome even with low-calorie diets and increased physical activity.

If you are struggling with weight loss despite diet and exercise, consider your environmental exposure to endocrine disruptors (found in plastics, pesticides, and certain consumer products). While you cannot control all environmental factors, minimizing exposure to plastics (e.g., avoiding heating food in plastic) and choosing fresh over processed foods may support metabolic health, especially if you were exposed to these chemicals during early development.

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.

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.

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.

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.