Browse the evidence

Resistance exercise training increases the proportion of endothelial cells and pericytes in human skeletal muscle, while acute resistance exercise increases the proportion of neutrophils.

To improve muscle vascularization and immune readiness, engage in consistent resistance training (3x/week). Expect an immediate, short-term spike in neutrophils after each session, but focus on the long-term benefit of increased endothelial and pericyte presence which supports muscle health and recovery.

The incidence of bone stress injuries in female athletes increases significantly with the cumulative number of Female Athlete Triad-related risk factors, rising from approximately 15-20% for single factors to 30-50% for combined factors.

For female athletes, injury risk is not just about how much you train, but your metabolic health. If you have low bone density, low body weight, irregular periods, or high dietary restraint, your risk of stress fractures multiplies. To prevent injury, you must address these underlying Triad factors—specifically ensuring adequate energy availability and bone health—rather than just modifying training volume.

Six weeks of low-volume sprint interval training (SIT) improves peripheral arterial distensibility and endothelial function to a similar extent as high-volume traditional endurance training (ET) in healthy young adults.

If you are healthy and want to improve your arterial health, you can achieve similar benefits to long, moderate cycling sessions by doing short, intense sprint intervals. Perform 4-6 sprints of 30 seconds each, 3 times a week, with 4.5 minutes of rest between sprints. This takes much less time than traditional endurance training but improves peripheral artery stiffness and function just as effectively.

Higher dietary intake of fruit, whole grains, and coffee is associated with increased circulating levels of hippurate, a metabolite produced by gut microbiota that serves as a marker for higher gut microbiome diversity.

To potentially support gut microbiome diversity and metabolic health markers, increase your intake of fruit, whole grains, and coffee. These foods are associated with higher levels of hippurate, a metabolite linked to a lower risk of metabolic syndrome.

Higher circulating levels of hippurate and greater gut microbiome diversity (Shannon index) are associated with a reduced risk of developing Metabolic Syndrome (MetS).

Maintaining a diverse gut microbiome, indicated by higher hippurate levels, is associated with a lower risk of metabolic syndrome. This can be supported by a diet rich in fruit, whole grains, and coffee.

Moderate alcohol consumption is associated with a lower risk of initial presentation for several cardiovascular diseases (myocardial infarction, heart failure, ischaemic stroke, peripheral arterial disease, abdominal aortic aneurysm) compared to abstinence, but heavy drinking increases the risk for most of these same conditions.

Moderate alcohol consumption is linked to a lower risk of some heart conditions compared to not drinking at all, but this benefit disappears and becomes harmful at heavy levels. Heavy drinking increases the risk of heart failure, stroke, and early death. The apparent benefit of moderate drinking is often overstated because studies that lump 'former drinkers' (who quit due to illness) with 'lifelong abstainers' make non-drinking look riskier than it is. For health, abstinence is a safe and valid choice; moderate drinking is not a prescribed treatment.

Bariatric surgery (specifically Roux-en-Y gastric bypass and sleeve gastrectomy) significantly reduces excess body weight (average 50-70% excess weight loss) and durably improves or resolves severe obesity-related comorbidities including type 2 diabetes, hypertension, and dyslipidemia, leading to prolonged survival compared to non-surgical management.

If you have a BMI of 40 or higher, or 35 or higher with serious health issues like diabetes or high blood pressure, and you have tried other treatments without lasting success, bariatric surgery is the most effective long-term option for significant weight loss and improving those health conditions. It is not a quick fix; it requires lifelong medical supervision, nutritional supplements, and dietary changes to maintain results and prevent complications.

Mediterranean Diet (MD) is the recommended first-choice diet for NAFL/NASH patients, improving hepatic steatosis and visceral fat, though its efficacy in advanced NASH requires further investigation.

Adopt a Mediterranean Diet rich in whole grains and healthy fats (MUFAs). This is the recommended first-line dietary approach to reduce liver fat and visceral fat. While it helps with insulin resistance and may reduce cardiovascular risk, its ability to reverse advanced NASH is not yet fully proven.

Sharper change of direction angles (≥60°) and higher approach velocities significantly increase knee joint loading and injury risk due to greater braking forces and lateral ground reaction forces, creating a performance-injury conflict.

When coaching change of direction, recognize that sharper cuts (60 degrees or more) and faster approaches place significantly higher loads on the knees. To reduce injury risk, focus on strengthening the athlete's ability to produce force rapidly and improving their neuromuscular control, which helps them tolerate these higher loads safely.

An 'angle-velocity trade-off' exists where faster approach velocities compromise the execution of the intended change of direction angle, mediated by the athlete's physical capacity.

Understand that as athletes move faster, they may not be able to execute the exact intended angle of their cut. This is normal and depends on their strength and control. Train athletes to manage this trade-off by improving their physical capacity, allowing them to maintain better control at higher speeds.

Exercise-based cardiac rehabilitation likely results in a slight reduction in all-cause mortality in patients with coronary heart disease.

While the reduction in death risk from exercise-based cardiac rehab is slight in the short term, it is a statistically significant benefit that contributes to overall survival.

Chronic dietary l-carnitine supplementation induces gut microbiota to convert l-carnitine into trimethylamine N-oxide (TMAO), an atherogenic metabolite, via a two-step microbial pathway involving gamma-butyrobetaine (γBB).

If you eat red meat regularly, adding l-carnitine supplements may increase your levels of TMAO, a compound linked to heart disease risk. Vegans and vegetarians generally do not produce significant TMAO from l-carnitine unless they supplement chronically. If you are an omnivore, avoid l-carnitine supplements unless prescribed, as they may promote atherosclerosis pathways.

Non-rapid eye movement sleep (NREMS) delta activity (slow-wave activity) serves as a primary indicator of sleep intensity and homeostatic sleep drive, linked to subsequent cognitive performance and attention.

Focus on sleep quality, not just hours. Deep sleep (delta waves) is crucial for next-day focus. Factors like alcohol, stress, or age can reduce delta waves, impairing recovery even if you sleep long enough.

Skipping breakfast is associated with a significantly higher risk of incident coronary heart disease (CHD) in men, independent of diet quality and lifestyle factors.

For men, consistently skipping breakfast is linked to a higher risk of heart disease. While this doesn't mean you must eat immediately upon waking, maintaining a regular breakfast habit appears protective for cardiovascular health, potentially by stabilizing metabolic markers like blood pressure and cholesterol.

Eating late at night (after going to bed) is associated with a significantly higher risk of incident coronary heart disease.

If you regularly eat after you go to bed, you may be increasing your risk of heart disease. Try to finish your last meal several hours before sleep to align with your body's natural metabolic rhythms.

Short-term exercise training (both sprint interval and moderate-intensity continuous) reduces systemic and intestinal endotoxemia (measured by LBP) and modulates gut microbiota (increasing Bacteroidetes, decreasing Firmicutes/Bacteroidetes ratio) in insulin-resistant subjects.

If you are insulin-resistant or pre-diabetic, engaging in just two weeks of exercise—whether through short, intense sprints or moderate continuous cycling—can significantly improve your gut health by reducing inflammatory markers and shifting your gut bacteria towards a healthier profile. You do not need to exercise for hours; consistency and intensity matter.

Obesity causes restrictive lung physiology (reduced FRC, ERV, TLC) and increased work of breathing, leading to exertional dyspnea and respiratory symptoms independent of primary lung disease.

If you are overweight, your extra weight physically restricts your lungs and makes breathing harder, especially during activity. This is a mechanical issue, not just 'being out of shape.' Weight loss can reverse these mechanical restrictions and improve lung function.

Obesity is associated with a higher prevalence and severity of asthma, characterized by increased symptoms and reduced response to corticosteroids, likely due to mechanical factors and systemic inflammation rather than increased airway hyper-responsiveness.

If you have asthma and are overweight, your condition may be harder to control with standard medications due to mechanical and inflammatory factors. Losing weight can improve your lung function and make your asthma medications more effective.

Probiotics enhance intestinal barrier function and modulate the immune system by increasing adhesion to the intestinal mucosa, producing antibacterial substances, and reducing pro-inflammatory cytokines.

Understanding that probiotics work by strengthening your gut lining and calming inflammation helps explain why they might help with digestive issues. It is not just about 'adding good bacteria' but about how those bacteria interact with your existing gut environment to protect you.

Insomnia and its components (daytime dysfunction, fragmentation, latency) are significantly associated with a higher risk of all-cause cognitive disorders and dementia.

If you suffer from chronic insomnia, fragmented sleep, or daytime dysfunction, these are not just annoyances; they are linked to a 27% higher risk of cognitive decline. Prioritizing sleep hygiene and seeking treatment for insomnia may be a crucial strategy for long-term brain health.

Sleep duration exhibits a U-shaped relationship with cognitive disorder risk, where both short (<4 hours) and long (>10 hours) nocturnal sleep durations are associated with elevated risk compared to optimal durations (5.6-7 hours).

Aim for 5.6 to 7 hours of nocturnal sleep for optimal cognitive protection. Both sleeping less than 4 hours and more than 10 hours is associated with a significantly higher risk of cognitive decline. If your sleep duration is consistently outside this window, consult a healthcare provider to investigate underlying causes.

For rural smallholder households, market-purchased foods contribute more to dietary diversity than subsistence production, regardless of season or nutrition status.

If you rely on farming for food, you must also engage with local markets to get a diverse diet. Growing many crops does not equal eating many food groups. To improve nutrition, prioritize income generation (farm or off-farm) to buy a variety of foods, especially perishables like vegetables, fruits, and animal products, which are rarely stored from harvest.

Night shift work schedules are significantly associated with symptoms of Shift Work Disorder (SWD), including insomnia and excessive sleepiness, with prevalence rates reaching 44.3% for three-shift rotations compared to 6.2% for day work only.

If you work night shifts, your risk of developing sleep disorders is significantly higher than day workers. The risk increases with the number of nights worked and how quickly you rotate between shifts. Prioritize sleep hygiene and consider advocating for schedule changes that allow more rest between shifts.

Rapid shift rotation (shifts separated by less than 11 hours off duty) is a significant risk factor for Shift Work Disorder symptoms, independent of the total number of night shifts.

Avoid scheduling shifts that start less than 11 hours after your previous shift ends. This rapid turnover is a key driver of sleep disorders, even if you don't work many nights.