Browse the evidence

Administering Cognitive Behavioral Therapy for Insomnia (CBTi) prior to Continuous Positive Airway Pressure (CPAP) therapy significantly improves insomnia symptoms and increases long-term CPAP adherence in patients with Co-morbid Insomnia and Sleep Apnea (COMISA) compared to CPAP alone or no treatment.

If you have both sleep apnea and insomnia, treating them separately often fails. The most effective strategy is to start with Cognitive Behavioral Therapy for Insomnia (CBTi) delivered by a therapist before or alongside starting CPAP. This approach not only fixes your sleeplessness but also helps you stick with your CPAP machine longer, leading to better overall health outcomes than using CPAP alone.

Women of reproductive age and pregnant women in Ethiopia, Kenya, Nigeria, and South Africa exhibit high prevalence of micronutrient deficiencies (iron, vitamin A, iodine, folate, zinc) and inadequate dietary intakes, with pregnant women facing higher risks than non-pregnant women.

Public health programs in these regions must prioritize screening and intervention for iron, vitamin A, iodine, folate, and zinc, particularly for pregnant women who are at significantly higher risk. Interventions should include dietary diversification, fortification, and supplementation, as current intakes are largely inadequate.

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.

Increasing red meat consumption by more than 0.50 servings per day over a 4-year period is associated with a 48% higher risk of developing type 2 diabetes in the subsequent 4 years.

If you are currently eating red meat, try to reduce your intake by half a serving per day over the next few years. This specific reduction is linked to a significantly lower risk of developing type 2 diabetes compared to maintaining or increasing your current intake. You do not need to eliminate it entirely to see benefits.

Reducing red meat consumption by more than 0.50 servings per day from baseline to the first 4-year follow-up is associated with a 14% lower risk of type 2 diabetes during the subsequent long-term follow-up (up to 16 years).

If you currently eat red meat, try to cut your intake by half a serving per day. While you might not see immediate changes in your blood sugar, this reduction is linked to a 14% lower risk of developing type 2 diabetes over the next 12-16 years. The benefits accumulate over time.

The association between increased red meat consumption and type 2 diabetes risk is partly mediated by body weight gain, but remains significant even after adjusting for initial BMI and concurrent weight changes.

Reducing red meat helps manage weight, which in turn lowers diabetes risk. However, even if you maintain your weight, reducing red meat still offers a protective benefit against type 2 diabetes, suggesting there are other metabolic benefits beyond just calorie control.

Reducing the price of low-fat snacks and increasing their availability in vending machines significantly increases their purchase and consumption.

To encourage healthier eating, make low-fat snacks cheaper and more visible in vending machines and stores.

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.

Intensive lifestyle counseling targeting physical activity, diet, and weight gain during pregnancy significantly reduces the proportion of large-for-gestational-age (LGA) newborns in high-risk women, but does not significantly reduce the incidence of gestational diabetes mellitus (GDM).

For high-risk pregnant women, intensive lifestyle counseling focusing on increasing physical activity (aiming for 800 MET minutes/week) and improving diet (more fiber, less saturated fat and sugar) can significantly reduce the risk of having a large-for-gestational-age baby. However, this approach may not be sufficient to prevent gestational diabetes itself. Adherence to these lifestyle changes is key to achieving better birthweight outcomes.

The Nordic hamstring exercise preferentially recruits the semitendinosus muscle rather than the biceps femoris long head.

Include Nordic hamstring curls in your routine for overall hamstring strength and injury prevention, but understand they primarily target the semitendinosus. To ensure balanced hamstring health, combine them with hip-extension exercises like the 45° hip extension to target the biceps femoris long head.

Genetic variation in the IL15RA gene (specifically the PstI polymorphism in exon 7) is strongly associated with greater muscle hypertrophy (lean mass gain) in response to resistance exercise training, although it is associated with reduced muscle quality gains.

Your genetics influence how much muscle you gain from resistance training, specifically through the IL-15 receptor pathway. While you cannot change your DNA, understanding that genetic variation explains some of the 'non-responder' phenomenon can help manage expectations. Focus on consistent resistance training (3x/week, 75-80% 1RM) as the primary driver of change, knowing that genetic factors will modulate the final outcome.

While IL15RA genetic variation (PstI polymorphism) is associated with greater muscle hypertrophy, it is also associated with reduced muscle quality (strength relative to muscle size) gains.

If you have genetic variants associated with high hypertrophy but low muscle quality, you may gain size without a proportional increase in strength. To counter this, prioritize strength-focused training (lower reps, higher load) alongside hypertrophy work to ensure neuromuscular adaptations keep pace with muscle growth.

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.

The Cambridge Index, derived from a short self-report questionnaire, validly ranks individuals into distinct physical activity categories (inactive to active) based on their objectively measured energy expenditure and moderate-to-vigorous physical activity time.

Use a validated short questionnaire to track your general activity level. You don't need to count every step perfectly; the goal is to distinguish between being sedentary, moderately active, or very active. This method is reliable enough for large-scale health studies to rank people accurately.

Activation of brown adipose tissue (BAT) through cold exposure increases whole-body energy expenditure and improves glucose and lipid metabolism in humans.

If you have detectable brown fat, exposing yourself to cool temperatures (around 17°C or 63°F) for about 2 hours daily can help increase your energy expenditure and reduce body fat. This works by activating your brown fat to burn calories as heat.

An online, semi-quantitative Food Frequency Questionnaire (FFQ) provides reproducible estimates of nutrient and food group intake and demonstrates moderate agreement with a 4-day weighed food record (WFR) for assessing energy and energy-adjusted nutrient intakes in healthy adults.

If you need to track your diet online, a well-designed Food Frequency Questionnaire (FFQ) that uses pictures for portion sizes is a reliable tool. It gives results very similar to writing down everything you eat for 4 days (weighed food record), making it a practical choice for long-term dietary tracking without the burden of daily weighing.

Baseline abundance of specific gut microbiota species (particularly Clostridium sphenoides, Eubacterium ruminantium, and Clostridium felsineum) can predict an obese individual's metabolic response (specifically cholesterol reduction) to dietary interventions.

If you are obese or have metabolic syndrome, your gut bacteria determine whether a high-fiber or prebiotic diet will lower your cholesterol. You cannot assume a diet will work just because it works for others. Testing your baseline microbiota (specifically levels of Clostridium sphenoides and related Firmicutes) can predict if you will benefit from specific dietary changes, allowing for personalized nutrition rather than trial-and-error.

Five nights of sleep restriction (4 hours time in bed) impairs glucose metabolism by increasing post-prandial glucose and insulin levels, while simultaneously increasing afternoon/evening cortisol and decreasing sex hormone binding globulin (SHBG).

If you are a healthy young man, restricting your sleep to 4 hours for five nights will significantly impair your body's ability to handle glucose after meals, even if your fasting blood sugar looks normal. This is accompanied by higher stress hormones (cortisol) and lower SHBG. To mitigate this, prioritize getting adequate sleep (7-9 hours) as it is a critical lever for metabolic health, comparable to diet and exercise.

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.