Browse the evidence

Excessive fructose consumption promotes nonalcoholic fatty liver disease (NAFLD) by acting as both a substrate and an inducer of hepatic de novo lipogenesis (DNL), leading to lipid accumulation and subsequent oxidative stress and inflammation.

Limit intake of added fructose, particularly from sugar-sweetened beverages and processed foods, as it directly drives liver fat accumulation and inflammation. Focus on whole foods where fructose is accompanied by fiber.

Fructose consumption negatively impacts peripheral tissues (gut, muscle, adipose) through interorgan cross-talk, leading to gut dysbiosis, visceral adiposity, and muscle insulin resistance/sarcopenia.

High fructose intake doesn't just hurt the liver; it can worsen gut health, increase belly fat, and reduce muscle insulin sensitivity. Reducing fructose supports whole-body metabolic health.

Current smoking is the primary modifiable risk factor for hip fracture burden, contributing to 7.5% of disability-adjusted life-years (DALYs) lost, followed by physical inactivity (5.5%) and type 2 diabetes (2.8%).

To reduce your risk of hip fracture and the associated loss of healthy life, prioritize quitting smoking and maintaining regular vigorous physical activity. These two behaviors account for the majority of preventable hip fracture burden in older adults. While maintaining a healthy weight is important, note that this study suggests higher BMI (up to obesity levels) may mechanically protect against hip fractures, though this comes with other health risks.

Physical inactivity (abstaining from vigorous activity) is the second largest modifiable risk factor for hip fracture burden, accounting for 5.5% of DALYs lost.

Engage in vigorous physical activity regularly. This study identifies physical inactivity as a major contributor to hip fracture risk. While specific exercise prescriptions are not detailed here, the association is strong enough to warrant prioritizing vigorous activity as a primary prevention strategy for hip health.

Specific polyphenols found in the Mediterranean Diet (e.g., resveratrol, quercetin, curcumin, EGCG) exert anti-inflammatory and antioxidant effects that improve metabolic markers, including insulin sensitivity and lipid profiles.

Incorporate foods rich in polyphenols such as berries, dark chocolate, green tea, olive oil, and spices like turmeric and cinnamon to leverage their anti-inflammatory benefits.

Zinc supplementation reduces the incidence, duration, and severity of diarrheal episodes and acute lower respiratory tract infections in children under five in low- and middle-income countries.

For families in resource-limited settings, ensuring children receive zinc supplements (10mg/day for <3 years, 20mg/day for older) during diarrhea episodes (for 10-14 days) significantly reduces the severity and duration of illness. However, relying solely on therapeutic use is suboptimal; preventive strategies are needed to maintain zinc status and reduce overall morbidity.

Targeted modulation of mitochondrial function through drugs, exercise, diet, gene therapy, stem cell therapy, and physical therapy can prevent or treat skeletal muscle atrophy.

Consider a multi-faceted approach to managing muscle atrophy. Incorporate regular exercise and a balanced diet as foundational steps. For more severe cases, consult healthcare providers about other potential therapies like drug treatments or physical therapy.

Inflammation and oxidative stress are crucial triggering factors in skeletal muscle atrophy, leading to increased proteolysis and reduced protein synthesis.

Manage stress and inflammation through lifestyle choices. Regular exercise, a healthy diet, and adequate sleep can help reduce oxidative stress and inflammation, supporting muscle health.

Exposure to blue-enriched light (peaking around 460 nm) during daytime hours acts as the strongest synchronizing agent for the human circadian rhythm by suppressing melatonin secretion, thereby enhancing alertness and cognitive performance.

Maximize exposure to bright, blue-enriched natural sunlight or high-quality artificial light during the morning and afternoon to anchor your circadian rhythm and boost daytime alertness. Conversely, minimize exposure to blue-emitting screens (phones, computers) in the 2-3 hours before bedtime to prevent melatonin suppression and sleep onset delays. Use night-mode filters on devices in the evening.

Chronic exposure to blue light at night, particularly from artificial sources like LED screens, disrupts circadian rhythms by suppressing melatonin, leading to sleep onset delays and increased health risks such as breast cancer in shift workers.

If you must use screens at night, use software that removes blue wavelengths (night shift mode) or wear amber-tinted glasses. Prioritize bright morning sunlight to help reset your clock after a night of disrupted light. For shift workers, strategic light exposure (bright light during shift, dark glasses on commute home) is critical.

Daily sedentary time is log-linearly associated with increased all-cause mortality in adults, with a mortality risk cut-off of 7 hours per day for self-reported measures and 9 hours per day for device-based measures.

Aim to keep your total daily sitting time under 7 hours if possible. If you use a fitness tracker, note that the risk threshold appears to be around 9 hours, but self-reported data suggests risk starts rising earlier. Since the risk increases log-linearly, every hour saved above these thresholds reduces mortality risk. Prioritize breaking up long sitting periods with standing or light movement.

Mental health issues, including depression, anxiety, and perceived stress, are negatively associated with sleep quality in college students.

If you are experiencing stress, anxiety, or depression, address these mental health issues, as they are strongly linked to poor sleep quality. Consider seeking professional support.

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.

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.

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.

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.

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.

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.