Browse the evidence

Physical function and anthropometric measurements (e.g., walking speed, grip strength) are practical phenotypic biomarkers that can perform better than DNA methylation in predicting health status.

Simple physical tests like walking speed and grip strength are highly effective, practical biomarkers for assessing your health status, sometimes outperforming complex DNA methylation tests.

The Sleep Regularity Index (SRI) and Interdaily Stability (IS) are sensitive to sleep fragmentation (awakenings) and napping, whereas Standard Deviation (StDev) and Composite Phase Deviation (CPD) are not sensitive to these factors.

If you want to assess sleep irregularity caused by waking up during the night or taking naps, use the Sleep Regularity Index (SRI) or Interdaily Stability (IS). Do not use Standard Deviation (StDev) or Composite Phase Deviation (CPD), as these metrics will ignore fragmentation and napping, giving you a false sense of regularity.

Social Jet Lag (SJL) measures weekly differences in sleep timing (workdays vs. free days) and is insensitive to day-to-day variability.

Use Social Jet Lag (SJL) only if you want to measure the difference between your workday and weekend sleep schedules. Do not use SJL to assess day-to-day consistency, as it will not detect daily fluctuations in sleep timing or duration.

Acetyl-L-carnitine (ALC) supplementation improves symptoms of diabetic neuropathy, including pain and nerve conduction, by enhancing neuronal energy metabolism and promoting nerve fiber regeneration.

If you have diabetic neuropathy, Acetyl-L-carnitine (ALC) may help reduce nerve pain and improve nerve function. It works by supporting the energy needs of nerve cells and promoting regeneration. It is generally well-tolerated.

High-fat diets rich in saturated fatty acids (e.g., lard) induce mitochondrial fission and dysfunction in liver and skeletal muscle, whereas diets rich in omega-3 polyunsaturated fatty acids (e.g., fish oil) promote mitochondrial fusion and improve function.

If you are consuming a high-fat diet, prioritize omega-3 polyunsaturated fatty acids (found in fish oil) over saturated fats (like lard). This choice supports mitochondrial fusion, which is associated with better metabolic function and reduced oxidative stress, whereas saturated fats tend to fragment mitochondria and impair function.

Sarcopenia, defined as depleted muscle mass, is a prevalent condition in chronically ill non-elderly patients (cancer, liver failure, ICU) and is strongly associated with adverse clinical outcomes including higher mortality, prolonged hospitalization, and increased infectious complications.

If you are chronically ill (e.g., cancer, liver disease) or in the ICU, ask your care team if your muscle mass has been assessed, particularly if you have had a CT scan. Standard weight checks may miss muscle loss (sarcopenia), which is linked to higher risks of complications and death. Identifying this early allows for targeted interventions to preserve muscle.

High cardiovascular fitness in midlife is associated with an 88% reduced risk of all-cause dementia and a delayed dementia onset by 9.5 years compared to medium fitness.

Focus on building cardiovascular fitness (aerobic capacity) during midlife (ages 40-60). This study suggests that high fitness levels measured objectively (e.g., via cycling tests) are strongly associated with a significantly lower risk of developing dementia later in life and a delayed onset of symptoms. While this study is observational and not causal, it supports prioritizing cardiovascular health in midlife as a potential strategy for long-term brain health.

Higher plasma levels of endogenous antioxidants (albumin, bilirubin, glutathione, vitamin E, vitamin C, carotenoids) are associated with a lower risk of cardiovascular disease (CVD).

Focus on maintaining healthy plasma levels of antioxidants through a diet rich in fruits, vegetables, and whole foods, rather than relying on single antioxidant supplements. Observational studies link higher natural levels of vitamins C, E, and carotenoids with lower CVD risk, but supplement trials have not confirmed these benefits and may even be harmful.

Dietary intake of antioxidants (vitamin E, vitamin C, carotenoids, polyphenols) from whole foods is associated with a lower risk of cardiovascular disease, whereas supplementation with single antioxidants is not.

Prioritize a diet rich in fruits, vegetables, and whole foods to maximize your intake of various antioxidants. This approach has been linked to lower CVD risk in observational studies. Avoid relying on single antioxidant supplements, as they have not shown benefit and may be harmful.

Lifestyle factors including regular physical activity, healthy diet (rich in vitamins/antioxidants), lower BMI, and no smoking are associated with longer telomeres and slower telomere shortening.

You can slow down cellular aging by adopting a healthy lifestyle. This includes eating a diet rich in fruits and vegetables, exercising regularly, maintaining a healthy weight, and avoiding smoking. These actions are linked to longer telomeres, which are associated with better health outcomes.

Sibutramine (10-30 mg/day) produces significant, dose-dependent weight loss in obese adults over 24 weeks when combined with caloric restriction and lifestyle modification, with effects reversing upon discontinuation.

Take sibutramine (10-30mg daily) alongside a strict diet (1200-1500 kcal) and daily exercise. Expect significant weight loss (9-12%) over 6 months, but understand that stopping the medication will likely lead to weight regain. This drug is a tool to help you lose weight, not a permanent fix.

Adolescent adiposity (BMI ≥ 25 kg/m² at age 18) is independently associated with a significantly increased risk of premature death in adulthood, even after adjusting for adult BMI and lifestyle factors.

Maintaining a healthy weight during adolescence is critical for long-term survival. Even if you gain weight as an adult, being overweight as a teenager adds an independent layer of mortality risk that isn't fully erased by later weight management. Focus on healthy habits early in life.

Higher initial BMI (>50 kg/m2) significantly increases the risk of failure (excess weight loss <50%) after laparoscopic adjustable gastric banding.

If you are superobese (BMI >50), gastric banding has a significantly higher failure rate. Consider other options or be prepared for a higher risk of not achieving significant weight loss.

SGLT2 inhibitors cause weight loss primarily through urinary glucose excretion (energy loss) and osmotic diuresis (water loss), with long-term fat loss driven by a metabolic shift toward lipolysis and fatty acid oxidation.

SGLT2 inhibitors promote weight loss by excreting glucose in urine and shifting your body to burn fat. This works regardless of your starting weight, though the effect is modest (1-3 kg). It is not just water weight; long-term fat loss occurs. Because they don't cause hypoglycemia, you are less likely to overeat to prevent low blood sugar compared to other diabetes meds.

Engaging in moderate physical activity, specifically brisk walking for approximately 5 hours per week (27 MET-h/wk), significantly reduces the risk of invasive breast cancer in postmenopausal women.

If you are postmenopausal, aim for about one hour of brisk walking every day. You do not need to do high-intensity interval training or heavy lifting to lower your breast cancer risk. Consistency with moderate activity like brisk walking is the key factor identified in this study. If you were previously inactive, starting this routine now can still provide a protective benefit.

While daily intake does not track daily expenditure, total energy intake over a multi-week period significantly correlates with total energy expenditure in structured training environments.

Over the course of a few weeks, your total food intake will roughly match your total energy burn if you are in a structured environment with fixed meals and activities. However, this balance is not automatic day-to-day; it emerges only when looking at the aggregate over time.

Body weight changes are significantly related to calorie balance over a week, but daily weight changes only weakly explain daily calorie balance variations.

Your weekly weight change is a moderate indicator of your weekly calorie balance, but daily weight fluctuations are a poor indicator of daily calorie balance. Do not try to adjust your daily food intake based on daily scale readings.

Stroke survivors retain the physiological capacity to adapt to aerobic exercise training, resulting in significant improvements in cardiorespiratory fitness (VO2 peak) comparable to healthy sedentary adults.

If you have had a stroke, you can still improve your heart and lung fitness through regular aerobic exercise like walking or cycling. Start with moderate intensity (where you can talk but not sing) for 3-5 days a week. Even small improvements in fitness can significantly help you perform daily activities and reduce fatigue.

Polyphenols found in the Mediterranean diet (e.g., from red wine and grapes) increase the endogenous synthesis of long-chain omega-3 fatty acids, while high omega-6 intake inhibits this synthesis.

To maximize the benefits of plant-based omega-3s (like flaxseed), consume them with polyphenol-rich foods like olive oil, red wine, or grapes. Avoid excessive omega-6 oils, which block the conversion of plant omega-3s into their more potent forms.

High plasma levels of Trimethylamine N-Oxide (TMAO) promote atherosclerosis and cardiovascular disease risk by impairing reverse cholesterol transport (RCT) and promoting foam cell formation.

High levels of TMAO, produced when your gut bacteria process nutrients like choline (eggs, meat) and carnitine (red meat), are linked to higher cardiovascular risk. This happens because TMAO impairs your body's ability to remove cholesterol from arteries (Reverse Cholesterol Transport). While you can't easily change your genes, understanding that gut bacteria play a key role suggests that dietary strategies might need to consider microbiome health, not just nutrient content.

High consumption of processed foods (up to 30% of calories in rich urban households) and palm oil (vanaspati) contributes to the 'double burden' of malnutrition and NCD risk, independent of total caloric intake.

Reducing the intake of processed foods and palm oil (vanaspati) is critical for improving health outcomes in India, especially for higher-income groups who consume these items frequently. Shifting away from subsidized cereals and processed foods toward whole foods can help address the double burden of malnutrition.

During the menopausal transition and early postmenopause, sleep symptoms (difficulty falling asleep, nighttime awakening, early morning awakening) are significantly associated with vasomotor symptoms (hot flashes), psychological distress (depressed mood, anxiety), and perceived health, rather than being driven solely by hormonal changes like FSH or estradiol levels.

If you are experiencing sleep issues during menopause, look beyond just hormone levels. Address hot flashes, manage stress, and monitor your mood, as these factors are strongly linked to sleep quality. Improving your overall perceived health and managing vasomotor symptoms may be more effective for sleep than focusing on hormonal markers alone.

Exercise increases mitochondrial function and decreases markers of Alzheimer's disease.

Engage in regular exercise to boost mitochondrial function. This specific adaptation helps decrease markers associated with Alzheimer's disease, offering a protective effect against cognitive decline.

Long-term DHEA replacement (50 mg/day) in patients with primary adrenal insufficiency reverses bone mineral density loss at the femoral neck and increases total and truncal lean mass without changing fat mass.

If you have Addison's disease, your body doesn't make enough DHEA. Taking 50mg of DHEA daily for a year can help stop bone loss in your hip and build muscle mass without adding fat. This is a specific medical treatment for a specific deficiency, not a general supplement for healthy people.