Browse the evidence

Dietary interventions that restrict specific macronutrients (particularly protein and amino acids) or utilize time-restricted feeding can extend healthspan and lifespan without requiring overall caloric restriction.

You can improve your metabolic health and potentially extend lifespan without eating less food by changing WHAT and WHEN you eat. Focus on reducing protein and specific amino acids (like methionine) or restrict your eating to an 8-9 hour window each day. These strategies have been shown to prevent metabolic diseases even in mice eating unhealthy diets, suggesting they are powerful tools for human healthspan.

High leisure-time sedentary behavior (television viewing ≥3 hours/day) is associated with adverse cardiovascular and diabetes biomarkers (lower HDL, higher triglycerides, blood pressure, and metabolic syndrome odds) in mid-life adults, with associations mediated by BMI.

If you watch TV for 3 or more hours a day, your HDL (good) cholesterol may be lower and your risk of metabolic syndrome higher, largely because this habit is linked to higher body weight. While you can't change the past, reducing leisure-time sitting time might help improve these biomarkers, especially if it helps manage your weight.

Occupational sitting (work sitting ≥3 hours/day) is associated with weaker and sparser adverse biomarker associations compared to leisure-time television viewing, and these associations are also mediated by BMI.

Sitting at work for 3+ hours a day is linked to slightly worse biomarkers (like lower HDL) than sitting for 0-1 hour, but the effect is weaker than watching TV for the same amount of time. This might be because work sitters often have other favorable lifestyle factors. Focusing on reducing leisure-time sitting (like TV) might yield greater health benefits.

Excessive dietary intake of carbohydrates, particularly fructose and sucrose, drives hepatic de novo lipogenesis through the activation of the transcription factor ChREBP, contributing to NAFLD progression.

If you have fatty liver, reducing sugar and refined carbohydrates (especially fructose from sodas and juices) can directly reduce the liver's production of new fat. This is because high carbohydrate intake activates specific genes (ChREBP) that turn sugar into fat in the liver, even if you aren't eating much dietary fat.

Circadian misalignment, such as night-shift work or irregular eating patterns, impairs hepatic metabolic function and increases the risk of developing NAFLD and insulin resistance.

Maintain a consistent sleep-wake cycle and try to align your eating window with your active hours. Disrupting your body's internal clock (e.g., through night shifts or late-night eating) can worsen insulin resistance and increase the risk of fatty liver, even if your diet is otherwise healthy.

Daily intake of 900 mg cocoa flavanols (450 mg twice daily) for 1 month significantly improves endothelial function (flow-mediated dilation) and reduces cardiovascular risk scores in healthy, middle-aged adults.

For healthy adults aged 35-60, consuming 900 mg of cocoa flavanols daily (split into two 450 mg doses) for at least one month may improve blood vessel function and lower cardiovascular risk. This can be achieved through standardized cocoa flavanol supplements or specific cocoa products. Ensure the product is standardized to contain flavanols, as regular cocoa powder may vary significantly.

Hip extensor and ankle plantar flexor relative muscular effort (RME) are primarily driven by increasing barbell load, whereas knee extensor RME is primarily driven by squat depth.

Design your squat program based on your target muscle. If you want to strengthen your glutes and calves, you must use heavy weights (high barbell load), as depth alone won't stimulate them enough. If you want to strengthen your quads, focus on going deep, regardless of the weight. This allows for targeted training where you can prioritize depth for quads and weight for posterior chain.

Bright light exposure (>10,000 lux) timed to follow the core body temperature minimum successfully advances the circadian phase of melatonin and cortisol by approximately 8-10 hours.

To shift your body clock earlier (e.g., for morning shifts), expose yourself to very bright light (>10,000 lux) for several hours starting shortly after you wake up. This is significantly more effective than normal room lighting. Ensure the light is safe for your eyes (use filtered devices) and avoid bright light in the evening.

Immediate-release melatonin at moderate doses effectively reduces sleep onset latency and improves symptoms associated with poorly coupled circadian rhythms, such as seasonal affective and bipolar disorders.

If you struggle with falling asleep or have seasonal mood shifts, immediate-release melatonin at a moderate dose is a valid, evidence-backed option. It works by signaling your brain that it is night, helping to reset your internal clock and initiate sleep.

Prolonged-release melatonin or synthetic agonists are required for replacement therapy aimed at maintaining sleep throughout the night, as immediate-release formulations are insufficient for sleep maintenance.

If you fall asleep easily but wake up frequently or early, immediate-release melatonin may not be enough. You may benefit from prolonged-release formulations or synthetic agonists designed to sustain melatonin signaling throughout the night.

Adherence to the DASH diet is inversely associated with all-cause, cardiovascular disease (CVD), stroke, and cancer mortality, with risk reduction increasing at higher adherence levels.

To lower your risk of dying from heart disease, stroke, or cancer, consistently follow the DASH diet principles. Focus on eating more whole grains, fruits, vegetables, nuts, and low-fat dairy, while cutting back on sodium, red meat, and sugar. Even modest adherence helps, but higher adherence (scoring above 20/40) provides even greater protection.

Low serum 25-hydroxyvitamin D levels (<50 nmol/L) are strongly associated with frailty in older men, but this association is significantly weaker or non-significant in older women.

If you are an older man, maintaining Vitamin D levels above 50 nmol/L may be critical for preventing frailty, as low levels are strongly linked to it. For women, the link is much weaker, suggesting other factors might be more dominant. Consult a doctor to check your specific levels, as the 'standard' threshold might not apply equally to both sexes.

High fructose consumption, particularly from High-Fructose Corn Syrup (HFCS), promotes NAFLD by inducing gut microbiota dysbiosis, increasing intestinal permeability, and directly causing hepatic steatosis through de novo lipogenesis.

Limit intake of added sugars, especially HFCS. High fructose intake is directly linked to liver fat accumulation and gut barrier dysfunction.

Deliberate overfeeding consistently induces weight gain in normal-weight adults, with approximately 38-44% of the gain consisting of lean body mass (LBM) rather than just fat.

If you are a normal-weight adult and you consistently eat more calories than you burn, you will gain weight. About 40% of that gain will be lean tissue (muscle, organs), not just fat. This happens regardless of whether you are male or female, or whether you are naturally thin or slightly overweight. There is no 'magic' resistance to weight gain in thin people.

The blood-glucose and cholesterol-lowering efficacy of oat beta-glucan is determined by the amount and molecular weight of beta-glucan that becomes solubilized in the gastrointestinal tract, which directly dictates the resulting digesta viscosity.

To get blood sugar and cholesterol benefits from oats, choose products where the beta-glucan remains soluble and has a high molecular weight. Processing methods like extensive extrusion, baking into bread, or freeze-thaw cycles can degrade the beta-glucan or reduce its solubility, rendering it ineffective regardless of the total fiber content. Look for minimally processed oats or specific concentrates that maintain viscosity.

Late-afternoon physical performance (strength, power, flexibility) is generally superior to morning performance due to increased core body temperature enhancing peripheral mechanisms like nerve conduction and blood flow.

Schedule your most demanding physical workouts (heavy lifting, sprinting, competitive events) for the late afternoon (4 PM - 8 PM). Your body temperature is higher, which improves nerve conduction, joint flexibility, and blood flow to muscles, leading to better performance and reduced injury risk compared to morning workouts.

Moderate-intensity aerobic exercise training (AET) reverses skeletal muscle atrophy and ubiquitin-proteasome system (UPS) overactivation in heart failure patients by restoring redox balance and normalizing proteasome activity.

If you have heart failure, moderate-intensity aerobic exercise (like brisk walking or uphill walking at 60% of your max capacity) for 50 minutes, twice a week in a supervised setting plus once at home, can reverse muscle wasting and improve your energy levels. This benefit is not achieved by medication alone, so you must include this specific type of exercise in your treatment plan under medical supervision.

Shift work and night work are associated with increased risks of obesity, metabolic syndrome, type 2 diabetes, and cardiovascular disease, primarily driven by circadian desynchronization, sleep deprivation, and behavioral changes.

If you work shifts, prioritize sleep duration (aim for 7+ hours), use bright light exposure during night shifts, and consider melatonin to help synchronize your circadian rhythm. Be mindful of diet and physical activity, as these behaviors can be altered by shift work.

Sleep deprivation associated with shift work leads to hormonal changes (reduced leptin, increased ghrelin) that increase appetite and obesity risk.

Ensure you get adequate sleep. If you are sleep-deprived, be aware that your body may signal higher hunger due to hormonal changes. Plan healthy snacks and meals to counteract this biological drive.

Circadian desynchronization caused by shift work contributes to insulin resistance and metabolic syndrome.

Try to maintain a regular sleep-wake cycle as much as possible. Use strategies like bright light exposure during night shifts and dark environments during the day to help synchronize your internal clock.

Oral administration of the growth hormone secretagogue capromorelin to older adults with mild functional limitations significantly increases lean body mass and improves specific measures of physical performance (tandem walk and stair climb) over 6-12 months.

For older adults (65-84) with mild physical limitations, oral capromorelin (a GH secretagogue) taken for 6-12 months can increase lean muscle mass and improve balance and stair-climbing ability. While it causes minor increases in blood sugar and insulin resistance, these were clinically minor in this study. Side effects like increased appetite and insomnia are common but generally tolerable. This is not a substitute for strength training, which was excluded in this study, but offers a pharmacological option for functional decline.

Analysis of beat-to-beat heart rate variability (HRV) using non-linear dynamics, specifically detrended fluctuation analysis (DFA) on pure sleep stage segments, can distinguish sleep stages (particularly deep sleep vs. REM sleep) more effectively than classical frequency analysis.

If you are analyzing sleep data, do not rely solely on standard heart rate averages or spectral power to determine sleep depth. Use non-linear analysis of beat-to-beat intervals, specifically filtering out transition periods between stages, to accurately distinguish between deep sleep (uncorrelated dynamics) and REM sleep (correlated dynamics).

In older adults (aged 64+), nighttime sleep duration of 7-7.9 hours is associated with the lowest mortality risk, while sleeping ≥10 hours in men and ≥8 hours in women significantly increases all-cause mortality.

If you are over 64, aim for 7 to 7.9 hours of nighttime sleep. Sleeping significantly longer (10+ hours for men, 8+ for women) is linked to higher death risk, likely due to underlying health issues rather than the sleep itself. Taking an afternoon nap does not increase or decrease this risk, so you can nap without worry if it helps you feel rested.

Consuming Atlantic salmon fed 100% fish oil significantly reduces serum triglycerides and vascular inflammation markers (VCAM-1, IL-6) in patients with coronary heart disease compared to salmon fed rapeseed oil.

If you have coronary heart disease, eating salmon fed on marine fish oil (high in EPA/DHA) for 6 weeks can significantly lower your triglycerides and reduce markers of vascular inflammation compared to eating salmon fed on vegetable oils. To maximize benefit, look for salmon sourced from farms using marine-based feeds.