Browse the evidence

Adequate intake of long-chain n-3 PUFAs (DHA/EPA) during pregnancy and lactation is critical for the normal neurological development and cognitive function of the infant.

Pregnant and breastfeeding women should ensure adequate intake of long-chain n-3 PUFAs (DHA/EPA) through diet (e.g., oil-rich fish) to support baby's brain development, while being mindful of mercury limits.

Daily administration of the selective androgen receptor modulator GTx-024 (enobosarm) at 3 mg significantly increases total lean body mass and improves physical function in healthy elderly men and postmenopausal women without causing adverse androgenic side effects.

For healthy older adults looking to build muscle, a daily 3mg dose of the SARM GTx-024 (enobosarm) taken for 12 weeks significantly increases lean body mass and physical function without the typical side effects of testosterone therapy. This intervention works best when combined with maintaining your current diet and exercise habits, as the drug itself drives the anabolic response.

Daily administration of GTx-024 (enobosarm) at 3 mg significantly reduces insulin resistance and fasting glucose levels in healthy elderly men and postmenopausal women.

For healthy older adults, a daily 3mg dose of GTx-024 (enobosarm) taken for 12 weeks significantly reduces insulin resistance and fasting glucose levels. This metabolic benefit is comparable to standard diabetes medications like metformin, suggesting potential utility for metabolic health in aging populations.

EPA reduces cardiovascular risk through multiple mechanisms including lowering triglycerides, reducing inflammation, stabilizing cell membranes, and improving endothelial function, distinct from DHA.

EPA works by lowering triglycerides, reducing inflammation, and stabilizing cell membranes, which together protect the heart.

Low levels of sex hormone-binding globulin (SHBG) are associated with reduced insulin sensitivity in women with PCOS, independent of BMI, suggesting SHBG may serve as a useful clinical marker for insulin resistance in this population.

Low SHBG levels are a sign of insulin resistance in PCOS. While not a treatment target itself, monitoring SHBG can help assess metabolic health. Improving insulin sensitivity through lifestyle or medication often raises SHBG levels.

Weight loss interventions restore the normal secretion pattern of adipokines, reducing inflammatory markers and improving metabolic profiles.

Losing weight through diet is the most effective way to fix the hormonal imbalance caused by obesity. As you lose weight, your fat tissue stops pumping out inflammatory signals, which improves your insulin sensitivity and reduces cardiovascular risk.

Sleep loss and sleep disturbances activate the hypothalamo-pituitary-adrenal (HPA) axis, resulting in elevated evening cortisol levels and a shortened quiescent period.

Prioritize consistent sleep duration. Even modest sleep restriction (e.g., 4-6 hours) can elevate evening cortisol levels, which is linked to metabolic risks like obesity and diabetes. Protecting your sleep window is a direct way to manage stress hormones.

Slow-wave sleep (SWS) exerts an inhibitory effect on cortisol secretion, contributing to the quiescent period of the HPA axis.

Focus on getting deep, restorative sleep. SWS is crucial for suppressing cortisol during the night. Disruptions to deep sleep (e.g., by alcohol or sleep apnea) may prevent this natural cortisol drop.

Waist circumference (WC) is a stronger predictor of type 2 diabetes risk than body mass index (BMI), and WC identifies cardiometabolic risk in individuals with normal BMI who would otherwise be missed by BMI-based screening.

Ask your doctor to measure your waist circumference. If you are a man, a measurement over 40 inches (102 cm) or a woman over 35 inches (88 cm) indicates higher risk for heart disease and diabetes, even if your weight (BMI) is normal. This measurement helps catch risks that standard weight checks miss.

Waist circumference is a valid surrogate marker for abdominal fat mass (both subcutaneous and intra-abdominal) and correlates strongly with cardiometabolic disease risk, though it does not distinguish between the two fat types.

Waist circumference is a reliable way to estimate abdominal fat, which is linked to heart and metabolic health. For consistent tracking, measure at the same spot (midpoint between ribs and hips) each time. It is more informative than weight alone for assessing metabolic risk.

Short sleep duration (≤5 hours per night) and difficulties maintaining sleep are associated with a significantly increased incidence of type 2 diabetes in middle-aged men.

If you are a middle-aged man, prioritizing sleep is a critical diabetes prevention strategy, not just a wellness luxury. Specifically, aim for more than 5 hours of sleep and focus on sleep continuity (staying asleep). If you struggle with waking up frequently during the night, this is a specific metabolic risk factor that warrants attention, potentially through sleep hygiene or medical evaluation for sleep apnea, as it independently raises your diabetes risk.

Weight loss restores insulin sensitivity in obese women with PCOS to levels comparable to BMI-matched controls, but early insulin secretion remains persistently elevated.

For obese women with PCOS, significant weight loss (approx. 12-13 kg) can fully restore insulin sensitivity to that of a healthy, non-PCOS woman of the same weight. However, even after this success, the body may still over-secrete insulin early in response to glucose, suggesting that PCOS involves a persistent beta-cell or secretory abnormality independent of fat mass. Weight loss is critical for metabolic health, but may not fully correct all hormonal dysregulations in PCOS.

Time-restricted eating (TRE), defined as restricting daily caloric intake to a consistent 8–12 hour window, prevents and manages chronic metabolic diseases by aligning nutrient intake with circadian rhythms, independent of caloric restriction.

Restrict your daily food intake to an 8–12 hour window each day. For example, eat all your meals between 8 AM and 4 PM, or 10 AM and 6 PM. Try to keep this window consistent every day. You do not need to count calories or restrict the amount of food you eat, but aligning your eating with your body's natural clock helps regulate blood sugar and metabolism.

Higher hepatic fat content, estimated by the Fatty Liver Index (FLI > 60), is independently associated with increased insulin resistance, higher coronary heart disease (CHD) risk, and early carotid atherosclerosis (increased intima media thickness) in middle-aged, nondiabetic adults.

If you are generally healthy but have a high Fatty Liver Index (calculated via waist, BMI, triglycerides, and liver enzymes), you likely have underlying insulin resistance and early signs of arterial thickening, even if your blood sugar and blood pressure are normal. Addressing liver fat through lifestyle changes can mitigate these hidden cardiovascular risks.

Replacing sucrose with polyols (such as erythritol, xylitol, or maltitol) significantly lowers the Glycemic Index (GI) and Insulinaemic Index (II) of foods, leading to improved long-term glycemic control (lower HbA1c) in type 2 diabetes patients without requiring large caloric deficits.

To improve blood sugar control, swap high-GI sugars (like sucrose) with polyols (like erythritol, xylitol, or maltitol) in your diet. You do not need to consume large amounts; even small daily substitutions (15-20g) can improve long-term glycemic markers like HbA1c. Be mindful of digestive tolerance, but the amounts needed for metabolic benefit are typically well-tolerated.

Administration of low-dose leptin reverses the adaptive reduction in energy expenditure and the decline in circulating thyroid hormones that occur as physiological responses to sustained weight loss.

If you have lost weight and feel your metabolism has slowed down permanently, this research suggests that your body's hormone levels (specifically leptin and thyroid hormones) may be driving this slowdown. While this specific study uses leptin injections, it highlights that metabolic slowdown after weight loss is a reversible hormonal state, not necessarily a permanent 'broken' metabolism. Consult a doctor about hormonal evaluations if you are struggling with metabolic adaptation post-weight loss.

Rotating night shift work (RNS) significantly increases the risk of chronic fatigue, sleep disorders, and cardiovascular symptoms compared to day shift work.

If you work rotating night shifts, your body is fighting its natural clock, leading to higher risks of heart issues, poor sleep, and exhaustion. This isn't just 'being tired'; it's a physiological stressor. Prioritize sleep hygiene aggressively on days off, and advocate for schedule designs that allow for adequate rest (e.g., at least 11 hours between shifts) and clockwise rotation, which are less disruptive to your circadian rhythm.

Caffeine produces dose-dependent psychomotor effects where low doses (250 mg) enhance performance and subjective pleasantness, while high doses (500 mg) impair performance and increase adverse somatic symptoms.

Stick to a moderate dose of caffeine (around 250 mg, roughly two cups of coffee) for optimal performance and mood benefits. Taking a high dose (500 mg) does not improve performance further and significantly increases the risk of anxiety, restlessness, and physical discomfort. Monitor your plasma concentration if possible, but generally, less is more once you pass the moderate threshold.

Overweight/obese women have higher plasma leptin levels per unit of adiposity (leptin/adiposity ratio) compared to normal weight women, and this ratio decreases significantly after sustained weight loss in the overweight/obese group.

If you are overweight, your body produces more leptin for every pound of fat than a lean person does. When you lose weight, this 'leptin efficiency' improves significantly, dropping by about 30%. This suggests that obesity involves a specific hormonal resistance or dysregulation that improves with fat loss.

High consumption of soy and isoflavones is associated with a decreased risk of post-menopausal breast cancer and localized prostate cancer.

If you consume soy products like tofu, miso, or natto regularly, current evidence from large Japanese cohorts suggests this dietary pattern is associated with a lower risk of breast and prostate cancer. This is likely due to the hormonal modulation properties of isoflavones.

Obesity (BMI >30 kg/m2) is an independent risk factor for miscarriage and reduced success in assisted reproductive technologies (ART), regardless of PCOS status.

If you are planning pregnancy or undergoing fertility treatment, maintaining a healthy weight reduces your risk of miscarriage. Higher BMI is linked to lower success rates in IVF and higher miscarriage rates, independent of other conditions like PCOS.

Adult-onset GH deficiency (AO) patients exhibit significantly greater psychosocial distress and greater improvements in quality of life (physical mobility, energy) following GH therapy compared to childhood-onset (CO) patients, who show no consistent long-term QoL benefits.

If you were diagnosed with GH deficiency as an adult, you are likely to see significant improvements in your energy levels and physical mobility after starting treatment. However, if your deficiency started in childhood, you may not experience these same quality of life benefits, even if your body composition improves. This is because your body adapted to the deficiency during your development, whereas adult-onset patients lose a previously normal state.

GH therapy increases lean body mass and decreases body fat in both childhood-onset (CO) and adult-onset (AO) GH-deficient patients, but AO patients show greater improvements in lipid profiles (Total and LDL cholesterol reduction) and waist/hip ratio reduction compared to CO patients.

GH therapy will likely improve your muscle mass and reduce body fat regardless of when your deficiency started. However, if your deficiency started in childhood, you may not see the same improvements in your cholesterol levels or waist size as someone who developed the deficiency as an adult. This is because the metabolic regulation of lipids and fat distribution differs between those who grew up with the deficiency and those who acquired it later in life.

Rapid increases in training load can cause immunosuppression, increasing illness risk if the athlete does not return to baseline within 7-21 days.

After a period of intense training, allow yourself 7-21 days to recover. If you don't feel back to baseline, you are at higher risk of illness. Monitor your health closely during this window.