Browse the evidence

Zinc and selenium are particularly important for antiviral defense mechanisms.

Include foods rich in zinc (e.g., meat, shellfish, legumes) and selenium (e.g., Brazil nuts, fish) in your diet to support your body's antiviral defenses.

Weight loss in obese individuals significantly reduces elevated serum Tumor Necrosis Factor-alpha (TNFα) concentrations, which may contribute to the restoration of insulin sensitivity.

For obese individuals, losing weight through a caloric deficit and exercise can lower inflammatory markers like TNFα. This biological improvement may help restore the body's sensitivity to insulin, making further weight management potentially easier over time.

Abdominal obesity in women causes reproductive disorders, including anovulation and infertility, primarily through functional hyperandrogenism and hyperinsulinemia which overstimulate ovarian steroidogenesis and decrease sex hormone-binding globulin.

If you have abdominal obesity and are struggling with irregular periods or infertility, your body's high insulin levels may be driving excess androgen production, which stops ovulation. The most effective first step is often modest weight loss (even 5-10%) combined with lifestyle changes to improve insulin sensitivity, which can restore ovulation and fertility without needing immediate pharmacological intervention.

In older adults, a higher percentage of time spent in sedentary behavior and fewer breaks in sedentary time are associated with a significantly greater likelihood of metabolic syndrome, independent of moderate-to-vigorous physical activity levels.

If you are over 60, simply exercising for an hour a day may not be enough to protect your metabolic health if you sit for the rest of the day. To lower your risk of metabolic syndrome, focus on reducing your total sitting time and, crucially, breaking up long periods of sitting with brief movements or standing up frequently throughout the day.

24 hours of wakefulness reduces the amplitude of daily metabolic rhythms (cosinor amplitude) for the majority of metabolites, particularly those that peak during the day.

Staying awake for 24 hours flattens the natural daily ups and downs of your metabolism. This means your body's normal timing for processing nutrients and hormones gets disrupted, which can affect how you feel and perform.

High-fat Western diets promote gut dysbiosis characterized by increased Gram-negative bacteria, leading to metabolic endotoxemia (circulating LPS), systemic inflammation, and insulin resistance.

Reduce saturated fats and increase fiber intake. This shifts gut bacteria away from endotoxin-producing species, lowering circulating LPS and reducing the risk of insulin resistance and inflammation.

Administration of Akkermansia muciniphila improves metabolic profiles, reduces fat mass, and improves insulin sensitivity in obese and diabetic subjects.

Focus on prebiotics that support the growth of Akkermansia muciniphila. This bacteria is naturally low in obese/diabetic individuals, and restoring its levels is linked to better insulin sensitivity and reduced inflammation.

Physical activity based interventions specifically reduce the odds of gestational diabetes, whereas diet-based interventions do not show a significant reduction in gestational diabetes in IPD meta-analysis.

Engage in moderate physical activity during pregnancy. This specific type of intervention has been shown to reduce the risk of gestational diabetes.

Vitamin D supplementation (700-800 IU/d) reduces hip fracture risk in elderly individuals only when combined with calcium supplementation; vitamin D alone provides no significant benefit.

If you are over 50 and concerned about hip fractures, taking Vitamin D alone is likely ineffective. You need to combine 700-800 IU of Vitamin D with 1000-1200 mg of Calcium daily. This combination is most critical for those who are deficient or live in supervised settings where compliance is higher. For healthy community-dwelling individuals with good diet, the benefit may be minimal.

High consumption of ultra-processed foods (defined as >4 servings daily) is independently associated with a 62% increased hazard of all-cause mortality compared to low consumption.

To lower your risk of early death, limit ultra-processed foods to less than 4 servings per day. Focus on reducing items like sugary drinks, processed meats, and packaged snacks, as these contribute most to the risk. Prioritize whole or minimally processed foods.

Each additional daily serving of ultra-processed food is associated with an 18% relative increase in all-cause mortality risk.

Track your daily servings of ultra-processed foods. Each extra serving adds 18% to your mortality risk. Reducing even one serving per day can significantly lower your long-term health risk.

Sleep continuity disturbance (forced awakenings) impairs endogenous pain-inhibitory function (DNIC) and increases spontaneous pain, whereas simple sleep restriction without continuity disturbance does not.

If you suffer from chronic pain, prioritize sleep continuity over just total hours. Frequent awakenings (even if you get enough total time) can disable your body's natural pain-killing systems. Focus on uninterrupted sleep blocks rather than just time in bed.

Grip strength cutpoints of <26 kg for men and <16 kg for women identify clinically relevant weakness associated with mobility impairment (gait speed <0.8 m/s) in older adults.

To screen for mobility risk in older adults, measure grip strength. If a man's grip is below 26 kg or a woman's is below 16 kg, they are at significantly higher risk for slow walking and disability. This simple test helps identify who might benefit from strength interventions.

Obese individuals exhibit significantly lower diet-induced thermogenesis (DIT) compared to lean individuals when matched for age and other factors.

Obesity is associated with a reduced ability to burn calories through diet-induced thermogenesis. This means that obese individuals may not burn as many extra calories from food as lean individuals, potentially contributing to weight maintenance challenges.

Gut-derived satiety peptides, specifically GLP-1 and PYY(3-36), reduce food intake and promote weight loss through vagal afferent signaling and hindbrain/hypothalamic receptors.

Your gut naturally releases hormones like GLP-1 and PYY after eating to tell your brain you are full. Medical treatments can mimic these hormones to help reduce appetite and aid weight loss, particularly in obesity.

Regular aerobic exercise reverses age-related endothelial progenitor cell (EPC) dysfunction by increasing both the number and migratory activity of EPCs in older adults.

If you are an older adult who has been sedentary, starting regular aerobic exercise can help restore your body's ability to repair blood vessels by increasing the number and activity of endothelial progenitor cells. This is a direct countermeasure to age-related vascular decline.

Smoking cessation causes significant weight gain (mean 1-5.9 kg at 1 year) primarily through increased caloric intake, decreased resting metabolic rate, and increased lipoprotein lipase activity in subcutaneous fat.

Expect to gain 1-6 kg after quitting. This is normal and driven by metabolic changes and increased eating. Use nicotine replacement (gum/patch) or bupropion to help manage this gain and improve quit success rates.

Smoking cessation improves insulin sensitivity and cardiovascular risk factors despite associated weight gain.

Even if you gain weight after quitting, your body's ability to handle sugar and your heart health will improve. This is a net positive for your long-term health.

Endurance training can induce muscle hypertrophy (7-11% increase in mass) in the quadriceps, particularly in sedentary individuals or those with limited exercise experience, through mechanisms independent of mTORC1.

If you are new to exercise or sedentary, starting an endurance program like cycling will likely build muscle in your legs, not just burn calories. This hypertrophy is comparable to what you might see from resistance training over the same period.

Concurrent training (combining endurance and strength) can impair strength adaptations and muscle hypertrophy, potentially due to a significant caloric deficit and negative energy balance rather than just molecular interference (AMPK/mTORC1).

If you combine cardio and weights, watch your calorie intake. The 'interference' effect is often due to not eating enough to support muscle growth, not just molecular conflicts. Ensure you are in energy balance or a slight surplus to maintain strength gains.

Sleep deprivation (defined as <6-7 hours/night or acute/chronic restriction) increases the risk of infectious diseases by impairing innate and adaptive immune responses, including reduced T-cell efficacy and antibody production.

Prioritize getting 7-8 hours of sleep nightly to maintain robust immune function. Chronic sleep restriction (<6 hours) significantly impairs your body's ability to fight off viruses and bacteria, making you more susceptible to respiratory infections and reducing the effectiveness of vaccines. Treat sleep as a critical health intervention, not optional downtime.

Walking as a mode of active commuting is associated with lower risk of cardiovascular disease (CVD) incidence and mortality, but not all-cause mortality or cancer outcomes, compared to non-active commuting.

Walking to work is a great way to protect your heart. This study links walking to lower heart disease risk. However, it didn't significantly lower death rates or cancer risk like cycling did. If you can't cycle, walking is still a valuable health habit, especially if you walk longer distances.

Mixed-mode commuting that includes cycling is associated with lower risks of all-cause mortality, cancer incidence, and cancer mortality compared to non-active commuting.

If you can't cycle the whole way, try mixing it in. This study links mixed-mode commuting (driving + cycling part of the way) to lower death and cancer risks. It didn't help as much as pure cycling, but it's still better than driving alone. Walking as part of a mixed commute didn't show benefits.

Prescribed moderate-intensity exercise does not increase the risk of injury or illness in overweight and obese adults compared to sedentary controls; injury risk is driven by BMI, not exercise volume.

If you are overweight or obese, starting a moderate walking program (150-300 minutes/week) will not increase your risk of injury compared to staying sedentary. Your body weight (BMI) is a stronger predictor of injury than the exercise itself. Focus on gradual progression and weight loss to reduce injury risk.