Browse the evidence

Thiazolidinediones (TZDs) improve insulin sensitivity primarily by acting as PPAR-gamma agonists, which promotes adipocyte differentiation and reduces the release of free fatty acids and TNF-alpha from adipose tissue, thereby improving peripheral insulin sensitivity.

If prescribed, TZDs like rosiglitazone or pioglitazone are effective medications for improving insulin sensitivity. They work by changing how fat cells behave, reducing harmful substances that block insulin. Be aware they may cause modest weight gain, but this is often subcutaneous fat, which is less harmful than visceral fat.

Chronic glucocorticoid treatment suppresses brown adipose tissue (BAT) activation in humans, reducing both the volume and glucose uptake of active BAT.

If you are on long-term steroid medication, your body's ability to burn fat via brown fat may be suppressed, potentially contributing to weight gain. This is a known side effect of chronic steroid use, distinct from the acute effects seen in healthy individuals.

Full PPARγ agonists (thiazolidinediones/TZDs) improve insulin sensitivity and induce white fat browning but cause adverse effects including weight gain, visceral obesity, water retention, and increased cardiovascular/bone fracture risk.

Full PPARγ drugs (TZDs) work for blood sugar but often cause weight gain and other health risks. Doctors may prescribe partial agonists or newer drugs to get the blood sugar benefits without the weight gain.

Phosphorylation of PPARγ at Ser273 selectively activates diabetic gene programs (causing insulin resistance) without affecting adipogenic or osteogenic programs, whereas Ser112 phosphorylation promotes osteogenesis.

This is a molecular mechanism. It explains why some diabetes drugs cause insulin resistance despite lowering blood sugar. Researchers are trying to block this specific phosphorylation to make better drugs.

Intermittent rapamycin dosing (once every 5 days) mitigates glucose intolerance and beta-cell dysfunction while maintaining mTORC1 inhibition, compared to daily dosing.

If using rapamycin for longevity, consider an intermittent schedule (e.g., once every 5 days) rather than daily dosing. This approach appears to preserve the anti-aging benefits (mTORC1 inhibition) while significantly reducing the risk of glucose intolerance and beta-cell dysfunction seen with daily use. Consult a physician for dosing protocols.

Rapamycin analogs (everolimus and temsirolimus) inhibit mTORC1 effectively but have a reduced impact on glucose tolerance compared to rapamycin.

If considering mTOR inhibition for longevity, discuss rapamycin analogs like everolimus or temsirolimus with your doctor. These drugs may provide similar anti-aging benefits (mTORC1 inhibition) with a lower risk of causing glucose intolerance compared to rapamycin.

In patients with Obstructive Sleep Apnea (OSA), the uvula exhibits significantly greater skeletal muscle mass and fat content compared to normal subjects, contributing to pharyngeal narrowing.

For individuals with OSA, structural changes in the throat, specifically an enlarged and fatty uvula, contribute to airway blockage. This suggests that treatments targeting airway structure, such as surgical removal of excess tissue (UPPP), may be effective because they address these specific anatomical abnormalities.

Non-Hispanic Black and Mexican-American women exhibit significantly lower cardiovascular health (CVH) scores compared to Non-Hispanic White women, with these disparities persisting unchanged from 1999 to 2012.

For Non-Hispanic Black and Mexican-American women, cardiovascular health scores remain significantly lower than those of Non-Hispanic White women. This gap has not closed between 1999 and 2012. Focus on the 7 key metrics: diet, physical activity, smoking, BMI, blood pressure, blood glucose, and cholesterol. Culturally competent prevention strategies are essential to address these persistent gaps.

Oral administration of pure ergothioneine (5mg or 25mg daily for 7 days) to healthy humans results in avid absorption and retention, but produces no statistically significant reduction in biomarkers of oxidative damage or inflammation.

Taking ergothioneine (5-25mg daily) is safe and your body will store it efficiently, but if you are healthy and not under extreme stress, you should not expect it to lower your oxidative stress or inflammation markers. The body likely stores it for times of actual injury or high stress rather than using it as a daily antioxidant in healthy states.

Ethinyl Estradiol-Cyproterone Acetate (EE-CA) oral contraceptives significantly increase serum leptin and BMI in nonobese women with PCOS, despite improving hyperandrogenism.

EE-CA pills effectively lower testosterone in nonobese PCOS patients but may slightly increase body weight and significantly raise leptin levels. Patients should be aware of these metabolic changes while benefiting from improved menstrual cycles.

Dietary phytoestrogens (specifically soy isoflavones) do not significantly alter circulating testosterone, free testosterone, or estradiol levels in healthy adult men, refuting concerns that soy intake causes feminization or hypogonadism.

If you are a healthy man, you can consume soy products without worrying about your testosterone levels dropping or developing feminine traits. Large-scale reviews confirm soy intake does not alter your sex hormone balance.

Obesity and metabolic dysfunction are associated with significantly elevated circulating levels of extracellular vesicles (EVs), particularly those derived from platelets, endothelial cells, and adipocytes, which serve as biomarkers for metabolic stress and insulin resistance.

If you have obesity or metabolic syndrome, your body is likely releasing higher levels of extracellular vesicles (EVs) into your blood. These are not just waste; they carry signals that can worsen insulin resistance and inflammation. While there is no direct 'EV treatment' yet, lifestyle interventions like weight loss, diet, and exercise have been shown to reduce these elevated EV levels, suggesting that managing metabolic health directly impacts this signaling pathway.

Adipose tissue-derived extracellular vesicles (EVs) mediate communication between adipose tissue and other organs (like the liver), contributing to insulin resistance and systemic metabolic dysfunction in obesity.

Your fat cells are not just storage; they send signals to your liver and other organs via tiny vesicles. In obesity, these signals can promote insulin resistance. Improving your metabolic health through diet and exercise can normalize these signals, reducing the burden on your body's regulatory systems.

Adipose tissue macrophage (ATM)-derived EVs containing miR-155 contribute to glucose intolerance and insulin resistance by suppressing adipogenic transcription factors PPARγ and CEBPβ.

Immune cells in your fat tissue send out tiny vesicles that can affect how your body handles sugar. In obesity, these vesicles may carry specific RNA molecules that worsen insulin resistance. Losing weight can change the content of these vesicles, potentially improving your metabolic health.

Disproportionate exposure to outdoor advertising for high-calorie, low-nutrient foods and sedentary entertainment in low-income and minority neighborhoods contributes to obesigenic environments and health disparities.

If you live in a neighborhood with high density of fast food and sedentary entertainment ads, your environment is actively working against healthy choices. Focus on environmental strategies: avoid stores with heavy promotional displays of unhealthy items, and support local policies that limit outdoor advertising density in residential zones.

Chronically elevated circulating GIP levels (approx. 15 ng/mL) improve glucose homeostasis, insulin sensitivity, and reduce diet-induced obesity and hepatic steatosis, whereas excessively high levels (>60 ng/mL) induce GIP resistance and negate these benefits.

This preclinical study suggests that maintaining moderate levels of the hormone GIP (around 15 ng/mL) may support healthy weight and blood sugar control, whereas extremely high levels might stop working. This highlights the importance of hormonal balance rather than just suppression or stimulation.

Calcium ions (Ca2+) regulate skeletal muscle plasticity and adaptation through slower, sustained shifts in cytosolic Ca2+ levels that activate specific signaling pathways, distinct from the rapid oscillations driving acute contraction.

To trigger muscle adaptation (like fiber type shifting or growth), you need to create specific calcium signaling patterns through your training style (e.g., volume, frequency), not just move heavy weights. The biochemical signal of calcium is the bridge between the mechanical act of exercise and the genetic instruction to change muscle structure.

Store-Operated Calcium Entry (SOCE) is a critical mechanism for sustaining contractility during repeated contractions and contributes to long-term muscle remodeling by enhancing gene expression via NFAT.

High-repetition or endurance-style training may be necessary to engage SOCE pathways, which support sustained force and contribute to muscle remodeling. Ignoring this may limit adaptations related to fatigue resistance and fiber type switching.

Phosphorylation of the Ryanodine Receptor 1 (RyR1) by CaMKII and PKA modulates channel activity, with hyperphosphorylation potentially leading to 'leaky' channels, increased open probability, and decreased contractility under resting conditions.

Excessive training stress or fatigue might lead to 'leaky' calcium channels due to phosphorylation changes, reducing force output. Recovery and proper training load management are essential to maintain channel integrity.

Obese women exhibit altered caffeine metabolism, specifically excreting significantly higher amounts of the metabolite theobromine compared to lean women, despite similar caffeine excretion levels.

Obese individuals metabolize caffeine differently, producing more theobromine. This metabolic difference may contribute to the blunted thermogenic response observed in obesity, suggesting that standard caffeine dosing may not yield identical metabolic effects across different body compositions.

Excess dietary protein cannot be stored in the body and is instead oxidized for energy or converted to glucose/urea, meaning high protein intake does not directly lead to increased tissue storage without concurrent resistance training.

Do not expect high protein intake alone to build muscle or add mass. If you are not exercising, your body will burn the excess protein for energy or excrete it as urea. To utilize protein for tissue growth, you must combine adequate intake with resistance training.

Gluconeogenesis from amino acids is a vital survival mechanism during starvation or low-carbohydrate intake, mobilizing muscle tissue to maintain blood glucose levels.

When you restrict carbohydrates or fast, your body makes glucose from non-carb sources, including amino acids from muscle. This is a normal survival mechanism. Combining this with adequate protein intake and resistance training helps minimize muscle loss during these periods.

In women with PCOS, increasing adiposity (BMI) significantly blunts LH pulse amplitude and mean LH levels, rendering LH-based diagnosis unreliable in obese subjects (BMI ≥ 30 kg/m²), whereas LH pulse frequency remains elevated regardless of BMI.

If you have PCOS symptoms (like irregular periods or high androgens) but your LH levels look normal, do not assume you are free of PCOS if you are overweight. Obesity suppresses LH levels in PCOS patients, masking the typical hormonal signature. Diagnosis should rely on other criteria (ultrasound, androgens) rather than LH alone if your BMI is 30 or higher.

Relocating from Latin America to the USA during early life (before age 18) causes a persistent reduction in the Prevotella to Bacteroides ratio and lower fungal alpha diversity, whereas late-life relocation (after age 45) is associated with high bacterial and fungal diversity and high Prevotella to Bacteroides ratios.

If you moved to the US from Latin America as a child, your microbiome likely adapted to a Western diet early on, resulting in lower fungal diversity and a lower P:B ratio. If you moved as an adult, your microbiome may retain more features of your country of origin (higher diversity, higher P:B ratio). To improve your microbiome, focus on dietary acculturation: increasing fiber, whole grains, and vegetables while reducing red meat and trans fats can help shift your microbiome toward a healthier profile, regardless of when you moved.