Browse the evidence

Caffeine intake, alcohol consumption, and irregular sleep-wake patterns reduce sleep quality in college students.

Limit caffeine and alcohol intake, and try to maintain a regular sleep-wake schedule to improve sleep quality.

Short-term caloric restriction increases myocardial triglyceride content and impairs diastolic function in healthy and diabetic individuals, whereas prolonged caloric restriction (6-16 weeks) reduces myocardial fat and improves diastolic function.

Be cautious with extreme, short-term crash diets, as they may temporarily increase heart fat and stress. A sustained, moderate caloric restriction over several weeks is more likely to reduce heart fat and improve heart function.

Adhering to the American Heart Association's 'Life's Essential 8' cardiovascular health metrics is associated with a significantly reduced risk of all-cause and cardiovascular disease-specific mortality in a linear dose-response manner.

To lower your risk of dying from heart disease or other causes, aim for high scores in eight key areas: healthy diet, physical activity, no nicotine, good sleep, healthy weight, normal blood lipids, normal blood glucose, and normal blood pressure. You do not need to be perfect in all areas; even small improvements in any single metric reduce your risk. Prioritize physical activity and quitting nicotine, as these had the largest impact on mortality in this study.

Vegan diets are associated with significantly higher intakes of fiber, polyunsaturated fatty acids (PUFA), and certain vitamins (C, E, folate) compared to meat-eater diets, contributing to a nutrient profile associated with lower risk of ischemic heart disease and type 2 diabetes.

Adopting a vegan or vegetarian diet naturally increases your intake of fiber and healthy fats (PUFA) while reducing saturated fats. This shift is linked to lower risks of heart disease and type 2 diabetes. Ensure your diet includes a variety of plant foods to maximize these benefits.

Compliance with general population dietary goals (fiber, fat, sugars) is high across all diet groups, including meat-eaters, with the notable exception of sodium intake which exceeds recommendations in all groups.

Most people, regardless of diet type, exceed recommended sodium limits. Focus on reducing processed foods to lower sodium intake. Meat-eaters can easily meet fiber and fat goals with minor adjustments, and all groups should monitor their sodium intake closely.

Adherence to a Mediterranean Diet style is associated with a lower degree of inflammation biomarkers and a protective role against cardiovascular and cerebrovascular events.

Focus on the overall pattern: prioritize vegetables, fruits, legumes, nuts, seeds, and olive oil as your primary fat source. Include moderate amounts of fish, poultry, and dairy, while limiting red meat and sweets. This pattern is linked to reduced inflammation and better heart health.

A high pre-treatment Prevotella-to-Bacteroides (P/B) ratio predicts significantly greater body weight and fat loss on energy-restricted diets, specifically when dietary fiber intake is high.

If you are struggling with weight loss on a standard calorie-restricted diet, your gut bacteria might be the missing variable. Specifically, if you have a high Prevotella-to-Bacteroides ratio, increasing your dietary fiber intake can significantly amplify your weight loss results. This suggests that personalized nutrition, based on gut microbiome testing, could be more effective than generic 'one-size-fits-all' diet advice.

Higher total dietary fiber intake (specifically from cereals) is inversely associated with colorectal cancer risk, with a 13% risk reduction per 10 g/day increase in total fiber.

To potentially lower your risk of colorectal cancer, aim to increase your daily dietary fiber intake by 10 grams. This can be achieved by adding whole grains, fruits, and vegetables to your diet. The study suggests that cereal fiber, in particular, is strongly associated with reduced risk for both colon and rectal cancers.

Cereal fiber intake is specifically associated with a reduced risk of rectal cancer, whereas fruit and vegetable fiber showed no significant association with rectal cancer in this cohort.

If you are concerned about rectal cancer, prioritize cereal fiber sources like whole grains (oats, barley, whole wheat) over just fruits and vegetables. This study suggests cereal fiber has a specific protective effect against rectal cancer that fruit and vegetable fiber did not demonstrate.

Low-intensity resistance exercise (<50% 1RM) combined with slow movement and tonic force generation produces muscle hypertrophy and strength gains equivalent to high-intensity resistance exercise (~80% 1RM).

To build muscle without lifting heavy weights, use a weight you can lift for 8 repetitions (approx 50% of your max). Perform each repetition slowly: 3 seconds lowering, 3 seconds lifting, and hold the fully extended position for 1 second without relaxing. Do 3 sets, 3 times a week. This creates metabolic stress that triggers growth similar to heavy lifting.

Higher Life's Simple 7 (LS7) scores, reflecting better cardiovascular health across seven modifiable risk factors, are associated with a significantly lower risk of incident stroke in adults.

Focus on optimizing your cardiovascular health using the Life's Simple 7 framework: manage blood pressure, cholesterol, and glucose; maintain a healthy BMI; avoid smoking; stay physically active; and eat a healthy diet. You do not need to achieve 'ideal' status in all areas immediately; even small improvements in these seven areas are associated with a significantly lower risk of stroke.

Short-term reduction in daily physical activity (step reduction) induces peripheral insulin resistance and ectopic fat accumulation (liver and visceral adipose tissue) in young, healthy adults within 14 days.

Even if you are young and healthy, dropping your activity level significantly (e.g., from 10,000 to 1,500 steps/day) for just two weeks can cause your body to store fat in the liver and become less sensitive to insulin. This happens even if your total body weight doesn't change. To prevent this, try to maintain your usual activity level or incorporate light movement during periods of reduced activity.

Short-term physical inactivity causes a significant loss of muscle mass (1-4%) in older adults within 14 days, accompanied by anabolic resistance.

If you are over 65, even a short period of reduced activity (like 14 days of low steps) can cause you to lose 1-4% of your muscle mass. This happens because your muscles become less responsive to protein (anabolic resistance). To protect your muscle, try to stay active even if you can't do intense exercise, and ensure you are eating enough protein.

The metabolic and musculoskeletal effects of short-term physical inactivity are reversible in younger adults but less so in older adults.

If you are young, you can likely reverse the negative metabolic and muscle effects of a few weeks of inactivity by returning to your normal routine. If you are older, recovery may be slower and less complete. It is more important for older adults to avoid long periods of inactivity in the first place.

Older adults with sarcopenia exhibit significantly lower dietary intakes of protein (g/kg), vitamin D, vitamin B-12, magnesium, phosphorus, and selenium compared to age- and sex-matched non-sarcopenic controls, despite having similar total energy intakes.

If you are an older adult experiencing muscle loss, strength decline, or functional issues, your diet likely lacks sufficient protein per kilogram of body weight and key micronutrients like Vitamin D, B12, magnesium, phosphorus, and selenium. Even if you eat enough total calories, the quality and specific nutrient density of your diet may be insufficient to support muscle health. Prioritize increasing protein intake and ensuring adequate intake of these specific micronutrients through food or supplementation, as these are commonly deficient in individuals with sarcopenia.

Sarcopenic older adults have significantly lower serum Vitamin B-12 concentrations and a higher prevalence of Vitamin B-12 deficiency compared to non-sarcopenic controls, despite similar dietary intakes of other nutrients.

Check your Vitamin B-12 levels if you are experiencing muscle loss. Even if your diet seems adequate, older adults often have lower serum B-12 levels, which is linked to sarcopenia. Supplementation may be necessary to correct deficiencies, as dietary intake alone may not maintain optimal serum levels in this population.

Sarcopenic older adults report significantly lower health-related quality of life and physical activity levels compared to non-sarcopenic controls, independent of malnutrition status.

Sarcopenia doesn't just affect muscle; it significantly lowers your quality of life and how active you feel. If you are noticing a drop in your ability to perform daily activities or a decline in your overall well-being, it may be related to muscle loss. Addressing muscle health through proper nutrition and physical activity can help improve these aspects of your life.

High frequency of ultra-processed food consumption is associated with a significantly higher risk of all-cause mortality in US adults, independent of demographic, socioeconomic, and health behavior factors.

If you eat ultra-processed foods (like sugary drinks, processed meats, sweetened cereals, and packaged snacks) frequently (e.g., more than 5 times a day), your risk of dying from any cause is about 30% higher compared to those who eat them less often. This risk holds true even if you try to balance your diet with other healthy foods. To protect your longevity, try to reduce the frequency of these highly processed items and focus on whole or minimally processed foods.

The BodyTime assay, which estimates internal circadian time from a single blood sample using a small set of transcript biomarkers, achieves accuracy comparable to the gold standard dim-light melatonin onset (DLMO) method while being significantly less costly and time-consuming.

If you are interested in optimizing the timing of medications or health interventions (chronotherapeutics), you can now determine your internal circadian phase with a single blood test (BodyTime assay). This test is as accurate as the traditional gold standard (melatonin testing) but is much faster, cheaper, and does not require special lighting conditions. This allows for personalized timing of treatments based on your unique biological clock.

Greater adherence to the Mediterranean diet is associated with longer leukocyte telomere length, a biomarker of biological aging.

Adopting a Mediterranean-style dietary pattern—high in vegetables, fruits, nuts, whole grains, legumes, fish, and olive oil, with moderate alcohol and low red meat—is associated with longer telomeres, a marker of slower biological aging. This benefit appears to come from the combined effect of the diet rather than any single food, suggesting that overall dietary quality is the key lever for longevity.

Step intensity, specifically 'peak-30 cadence' (fastest 30 minutes of walking per day), provides additional risk reduction for mortality and morbidity beyond total step count.

Try to walk briskly for short bursts during your day. You don't need to exercise formally; just walk faster for 30 minutes total (consecutive or not). This 'peak-30' intensity adds extra protection against heart disease and cancer on top of just walking more steps.

Moderate intensity endurance exercise (<70% VO2max) improves gut microbial diversity and reduces systemic inflammation by decreasing intestinal permeability.

Engage in moderate endurance exercise (below 70% of your max oxygen uptake) to support gut health. This level of activity has been shown to increase microbial diversity and reduce systemic inflammation by strengthening the gut barrier, without the negative permeability effects seen in extreme exertion.

Elite athletes exhibit higher gut microbial diversity and a specific enrichment of bacteria involved in short-chain fatty acid (SCFA) production compared to sedentary controls.

Elite athletes tend to have gut microbiomes enriched in bacteria that produce beneficial short-chain fatty acids (SCFAs) like butyrate. This is linked to their high training volume and specific metabolic demands, suggesting that consistent endurance training may shape the microbiome toward more efficient energy metabolism.

Intense exercise (>70% VO2max) can increase intestinal permeability and endotoxemia, leading to temporary systemic inflammation and gastrointestinal distress.

High-intensity or prolonged endurance exercise can temporarily compromise your gut barrier, leading to inflammation and GI issues. This is common in ultrarunning or intense military training. While the long-term benefits of training outweigh these acute stresses, managing hydration, nutrition, and recovery is crucial to mitigate these temporary negative effects.