Browse the evidence

Higher levels of physical activity, particularly vigorous intensity, are inversely associated with the risk of developing breast cancer in both premenopausal and postmenopausal women.

Engage in regular physical activity, aiming for vigorous intensity when possible, as it significantly lowers breast cancer risk for women of all ages. If vigorous exercise is not feasible, total or recreational activity still provides protective benefits, though less pronounced than vigorous activity.

Increased body adiposity, specifically higher BMI and adult weight gain, significantly increases the risk of breast cancer in postmenopausal women, particularly for hormone receptor-positive (HR+) tumors.

Maintain a healthy body weight and avoid adult weight gain to reduce breast cancer risk after menopause. This is especially important for preventing hormone receptor-positive breast cancers.

High consumption of ultra-processed foods (UPF) is associated with unbalanced nutritional intakes, specifically higher energy, added sugar, and saturated fat, and lower fiber, vitamins, and minerals, regardless of adherence to standard dietary guidelines.

To improve your diet quality, prioritize minimally processed foods. High consumption of ultra-processed foods is linked to higher energy intake, more added sugar, and fewer essential nutrients like fiber and calcium, even if you try to follow standard dietary guidelines. Focus on the degree of processing, not just the food group.

Attenuated (slow) heart rate recovery (HRR) after exercise is associated with a significantly increased risk of cardiovascular events and all-cause mortality in the general population.

To assess your long-term cardiovascular risk, measure your heart rate immediately after stopping moderate-to-vigorous exercise and again after 1 or 2 minutes. A smaller drop (attenuated HRR) indicates slower autonomic recovery and is linked to higher mortality risk. This is a simple, non-invasive metric you can track with any basic heart rate monitor to gauge your autonomic health and longevity risk, independent of your weight or blood pressure.

For every 10 beats per minute (bpm) decrement in heart rate recovery, the risk of cardiovascular events increases by 13% and all-cause mortality by 9%.

Your heart rate recovery speed matters incrementally. Each 10 bpm drop in your heart rate during the first 1-2 minutes after exercise is associated with a 9-13% reduction in your risk of death or heart disease. Improving this recovery speed through consistent aerobic training is a direct lever for longevity.

Ether-linked phosphatidylethanolamines (specifically PE-P and PE-O) are associated with lower insulin resistance (SSPG) and healthier metabolic profiles, contrasting with other lipid classes like Ceramides and TAGs which increase with IR.

Not all phosphatidylethanolamines are equal. Ether-linked forms (PE-P and PE-O) are associated with lower insulin resistance, while standard PEs and Ceramides are linked to higher resistance. This highlights the importance of lipid subclass specificity in metabolic health.

Global estimates indicate that more than 5 billion people do not consume enough iodine, vitamin E, or calcium, and more than 4 billion do not consume enough iron, riboflavin, folate, or vitamin C, based on dietary intake data excluding fortification and supplementation.

This analysis highlights that despite global efforts, a significant portion of the world's population does not get enough essential micronutrients like iodine, calcium, iron, and vitamins from food alone. Public health strategies need to target these specific gaps, potentially through fortification, supplementation, or dietary diversification, especially in regions with high inadequacy rates.

Women have a higher prevalence of inadequate intake than men for iodine, vitamin B12, iron, selenium, calcium, riboflavin, and folate, while men have higher inadequacy for magnesium, vitamin B6, zinc, vitamin C, vitamin A, thiamin, and niacin.

Nutritional needs differ between men and women. Public health interventions should consider these differences to effectively address specific micronutrient gaps in each sex.

High-intensity physical activity, particularly when performed in the evening or close to bedtime, is associated with poor sleep quality and difficulty initiating sleep.

If you exercise in the evening, avoid high-intensity workouts within 3 hours of bedtime. Opt for moderate intensity or finish your session earlier in the evening. High-intensity or long-duration (>90 min) evening exercise is linked to poorer sleep quality.

Phase angle (PhA) measured via bioelectrical impedance analysis (BIA) serves as a valid, non-invasive indicator of muscle quality and can accurately predict sarcopenia across different age and sex groups.

Use a bioelectrical impedance analysis (BIA) scale to track your Phase Angle (PhA). A higher PhA generally indicates better cellular health and muscle quality. If your PhA drops significantly below established cutoffs (e.g., <5.95° for young men, <5.04° for elderly men, <5.02° for young women, <4.20° for elderly women), it may signal sarcopenia risk, warranting a check on strength and muscle mass, even if your weight hasn't changed.

Achieving high energy and protein requirements on a vegan diet is challenging due to the high fiber content and low energy density of plant foods, which promote early satiety.

If you struggle to eat enough calories as a vegan, focus on energy-dense foods like nuts, seeds, and oils, and eat more frequently. Choose lower-fiber carbohydrate sources (like white rice or pasta) during high-training phases to avoid feeling too full to eat enough.

Obese individuals with low skeletal muscle mass or function (sarcopenic obesity) face significantly higher risks of frailty, disability, and mortality compared to non-obese counterparts with similar muscle alterations.

If you are obese, do not just focus on losing weight. Prioritize preserving your muscle mass through adequate protein intake and resistance exercise, as losing muscle along with fat significantly increases your risk of disability and early death.

Higher genetically predicted hand grip strength has a causal protective effect against fracture risk, but does not causally reduce all-cause mortality or cardiovascular disease risk.

Focus on building grip strength and overall muscle mass primarily to protect your bones and prevent fractures as you age, rather than expecting it to directly prevent heart disease or extend your life. Use resistance training to maintain functional capacity and reduce fall risk.

The COVID-19 pandemic caused a significant overall decrease in physical activity and mobility, alongside a significant increase in sedentary behavior, across diverse global populations.

During periods of restricted mobility or facility closures, expect a significant drop in physical activity. To mitigate this, prioritize utilizing available outdoor spaces (parks, trails) or adapting home environments, as access to these resources is a key determinant of maintaining activity levels during crises.

Higher appendicular skeletal muscle mass (ASMI) is independently associated with lower all-cause mortality, and accounting for muscle mass shifts the BMI associated with the lowest risk of death downward toward the normal range (22-25 kg/m2).

Do not rely on BMI alone to assess your health risk. If you have a 'normal' BMI but low muscle mass, your mortality risk may be higher than someone with a 'high' BMI but preserved muscle mass. Prioritize resistance training and protein intake to build or maintain skeletal muscle mass, as this is an independent protective factor against death, regardless of your weight.

Dietary polyamines (spermidine, spermine, putrescine) are absorbed from the gut, and prolonged oral supplementation increases blood levels of these polyamines in both animal and human subjects.

Eating foods rich in polyamines, such as natto (fermented soy), can increase the levels of spermine in your blood. This absorption is efficient, with a significant portion of ingested polyamines entering the bloodstream. While this confirms bioavailability, it does not automatically guarantee metabolic health benefits without further context.

Oral L-citrulline supplementation (3–10 g/day) effectively increases plasma L-arginine and nitric oxide (NO) bioavailability, leading to reduced resting blood pressure and arterial stiffness in pre-hypertensive and hypertensive populations, whereas it fails to improve endothelial function (FMD) in healthy young individuals.

If you have high blood pressure, taking 3-10 grams of L-citrulline daily (or eating equivalent amounts of watermelon) can help lower your blood pressure and improve artery stiffness. This works best if you are already pre-hypertensive or hypertensive. If you are young and healthy, you likely won't see changes in your blood vessel dilation, so don't expect performance benefits from this specific mechanism.

Vitamin D supplementation (50,000 IU weekly for 12 weeks) in healthy, vitamin D-deficient women significantly increases gut microbial diversity and shifts the microbiota composition toward a healthier profile by increasing Bacteroidetes and decreasing Firmicutes.

If you are vitamin D deficient, supplementation (50,000 IU weekly) can improve your gut health by increasing microbial diversity and favoring beneficial bacteria like Akkermansia and Bifidobacterium. This suggests that correcting vitamin D levels is not just about bones, but also supports a healthier gut environment.

Restrictive hypocaloric diets and bariatric surgery reduce total gut microbial abundance and decrease butyrate-producing bacteria (Firmicutes, Lactobacillus, Bifidobacterium), which may have long-term detrimental effects on the colon despite promoting weight loss.

While restrictive diets and bariatric surgery are effective for weight loss, they can negatively impact your gut microbiome by reducing beneficial bacteria that produce butyrate. To mitigate this, consider incorporating prebiotics or specific probiotics, which the review notes may restore a healthy microbiome and reduce body fat, rather than relying solely on caloric restriction or surgery for gut health.

Prebiotics and probiotics can positively modulate gut microbiota by increasing butyrate producers and reducing body fat, offering a potential alternative or adjunct to restrictive diets and surgery for improving metabolic outcomes.

If you are looking to support your gut health and potentially reduce body fat without drastic dietary changes or surgery, consider trying specific prebiotics and probiotics. The review suggests they can increase beneficial bacteria and reduce body fat, though results depend on the specific strain and duration of use.

High polygenic scores for obesity or type 2 diabetes significantly increase disease risk but are currently weak predictors of individual outcomes, necessitating the integration of lifestyle and environmental factors for accurate risk assessment.

Do not rely on direct-to-consumer genetic tests to predict your weight or diabetes risk. While you may have a higher genetic predisposition, these tests are currently poor predictors of individual outcomes. Focus on modifiable factors like diet, physical activity, and sleep, as these environmental factors interact with your genetics to determine your actual health status. Personalized care requires combining genetic insights with lifestyle data, not just genetics alone.

Time-restricted feeding (TRF) improves cardiometabolic health in individuals with obesity or type 2 diabetes, though some benefits may be attributable to reduced calorie intake rather than timing alone.

Try restricting your eating window to 8-10 hours per day. This may improve your metabolic health and help with weight management. However, be aware that some of the benefits might simply come from eating fewer calories because you have less time to eat. If you struggle with the timing, focus on reducing overall calorie intake, as that is likely the primary driver of weight loss.

Reducing household food waste and animal-source food consumption offers the highest synergistic potential for mitigating obesity, environmental pressure, and food demand compared to other interventions like eliminating underweight.

Focus on reducing household food waste and shifting dietary composition away from animal-source foods. These interventions offer the highest synergistic benefits for health and the environment, whereas simply addressing underweight has minimal impact on total food demand.

Severe sedentary behavior increases the risk of sleep disturbance, and this association is significantly mediated by elevated blood-cell-based inflammatory biomarkers (WBC, NEU, NLR, SII).

If you sit for more than 480 minutes a day (severe sedentary behavior), your risk of sleep disturbance increases. This risk is partly driven by your body's inflammatory response (measurable by blood tests). To mitigate this, you must break up long periods of sitting with movement, as this reduces the inflammatory burden that disrupts sleep.