Browse the evidence

Thirty-eight days of endurance exercise training significantly attenuates leucine oxidation and branched-chain 2-oxoacid dehydrogenase (BCOAD) activation during moderate-intensity exercise in humans.

If you start an endurance training program, your body becomes more efficient at sparing protein (leucine) during exercise. You do not need to increase your protein intake just because you are exercising more, as long as your intensity is moderate (around 60% VO2 peak). The body adapts by reducing the breakdown of amino acids for energy.

Two-year dietary weight loss interventions induce significant regression of carotid vessel wall volume (VWV), with the magnitude of regression mediated primarily by reductions in systolic blood pressure rather than specific macronutrient composition.

To reverse early carotid atherosclerosis, focus on sustainable weight loss that lowers your blood pressure. You do not need to adhere to a specific 'magic' diet (low-fat, low-carb, or Mediterranean); the key is achieving a caloric deficit that reduces weight and systolic blood pressure. This structural improvement in artery volume was observed over two years across all three dietary approaches, provided blood pressure was reduced.

Ketogenic diets provide short-term improvements in seizure frequency, weight loss, and glycemic control, but these benefits are often temporary and outweighed by long-term risks including nutrient deficiencies, adverse lipid profiles, and increased chronic disease risk.

If you try a ketogenic diet, expect short-term improvements in weight and blood sugar, but do not expect it to be superior to other healthy diets in the long run. Be aware that you may experience nutrient deficiencies, increased LDL cholesterol, and other health risks. For most people, the long-term risks outweigh the short-term benefits.

Consuming ≥1 serving per day of breakfast cereal (both whole and refined grain types) is associated with a significantly lower risk of becoming overweight (BMI ≥25 kg/m²) and reduced long-term weight gain in middle-aged and elderly men compared to rare or non-consumption.

For men looking to manage weight, eating at least one serving of breakfast cereal daily is associated with a lower risk of becoming overweight over the long term. This benefit appears to apply to both whole grain and refined grain cereals, suggesting that the act of eating a structured breakfast (likely with portion control and satiety benefits) is more important than the specific grain type. It is not a magic bullet, but a consistent habit linked to healthier weight outcomes in this population.

A sedentary lifestyle in older adults causes mitochondrial dysfunction, reduced oxidative capacity, and chronic systemic inflammation, whereas a recreationally active lifestyle preserves these parameters and mitigates age-related sarcopenia.

If you are an older adult, maintaining a recreationally active lifestyle (e.g., walking, gardening, cycling 3+ times a week) is critical for preserving muscle strength and mitochondrial health. Sedentary behavior, even if due to joint pain like osteoarthritis, accelerates mitochondrial dysfunction and inflammation. Prioritize consistent, moderate physical activity to counteract age-related decline.

Current statistical estimates of protein consumption in Africa likely overestimate actual intake due to post-harvest and cooking losses, meaning the severity of protein deficiency is greater than reported disappearance data suggests.

Do not rely solely on national average protein statistics to assess your personal risk. If you live in an area with poor storage or frequent power outages, actual protein intake is likely lower than official reports suggest. Prioritize accessible, shelf-stable protein sources or frequent small meals.

Dietary fiber (specifically fermentable fibers like pectin) reduces the production of indole, a precursor to the uremic toxin indoxyl sulfate, by triggering catabolite repression of the tnaA gene in indole-producing gut bacteria (e.g., E. coli).

To support gut health and potentially reduce the production of harmful metabolites like indole, incorporate fermentable fibers (such as pectin found in apples) into your diet. This encourages beneficial bacteria to produce protective metabolites (ILA, IPA) and suppresses the production of indole, which is linked to chronic kidney disease risk.

Long-term shift work, particularly involving night shifts, is strongly associated with increased risks of cardiovascular disease, metabolic disorders (type 2 diabetes, metabolic syndrome), and gastrointestinal issues, largely mediated by circadian misalignment, sleep restriction, and adverse lifestyle behaviors.

If you work nights or rotating shifts, prioritize protecting your sleep environment (dark, cool, quiet) and manage light exposure (bright light during shift, dark glasses on commute home). Be mindful of meal timing; eating late at night can worsen metabolic risk. Recognize that fatigue and digestive issues are common physiological responses to circadian disruption, not just personal failings, and consider strategies to align your schedule with your body's clock where possible.

In individuals with chronic kidney disease (CKD), the presence of sarcopenia (defined by low muscle strength, mass, or performance) significantly increases the risk of all-cause mortality and progression to end-stage renal disease (ESRD).

If you have chronic kidney disease, having low muscle strength or mass is a serious warning sign that increases your risk of death and needing dialysis. You should get your muscle strength checked (e.g., handgrip test) and prioritize physical activity, as it is one of the most effective ways to counteract muscle loss and improve your prognosis.

Low handgrip strength is significantly associated with a higher number of chronic diseases and multimorbidity in adults aged 50 and older, independent of chronological age, BMI, and other confounders.

Get your handgrip strength measured as part of a routine health check, especially if you are over 50. Low strength is a strong signal of underlying chronic disease burden, potentially more so than your age alone. While this study is observational, maintaining or improving muscle strength through resistance training is a feasible strategy to potentially reduce the risk of multiple chronic diseases and premature mortality.

High-intensity interval training (HIIT) is relatively safe for patients with coronary artery disease or heart failure when administered within supervised cardiac rehabilitation settings, with a major adverse cardiovascular event rate of 1 per 17,083 training sessions.

If you have stable heart disease or heart failure, high-intensity interval training is likely safe when done in a supervised cardiac rehab program. The risk of a serious heart event is extremely low (about 1 in 17,000 sessions). Do not attempt this unsupervised; ensure your condition is stable and you are monitored by cardiac staff.

Habitual consumption of spicy foods (specifically chili peppers) is inversely associated with total mortality, with high-frequency consumers (6-7 days/week) showing a 14% relative risk reduction compared to low-frequency consumers (<1 day/week).

If you enjoy spicy foods, eating them frequently (almost daily) is associated with a lower risk of death from all causes, particularly cancer, heart disease, and respiratory diseases. This benefit was observed in a large Chinese population study, suggesting that incorporating chili peppers into your regular diet may support longevity, provided you do not have specific digestive conditions that prevent you from tolerating them.

The mortality benefit of spicy food consumption is significantly stronger in individuals who do not consume alcohol compared to those who do.

If you do not drink alcohol, incorporating spicy foods into your diet may offer even greater longevity benefits than for drinkers. This suggests a potential synergistic health effect or that alcohol might blunt the metabolic benefits of capsaicin.

A high pre-treatment Prevotella-to-Bacteroides (P/B) ratio predicts significantly greater body fat loss when consuming a high-fiber, whole-grain diet (New Nordic Diet) compared to a standard diet, whereas individuals with a low P/B ratio show no such differential benefit.

If you are trying to lose fat using a high-fiber, whole-grain diet, your gut bacteria composition matters. A simple test of your Prevotella-to-Bacteroides ratio can predict success: if your ratio is high, you are likely to lose significant fat on this diet; if it is low, you may not see benefits over a standard diet, suggesting you might need a different nutritional approach.

Focusing on isolated nutrients for chronic disease prevention is counterproductive and potentially harmful, whereas whole food patterns (food synergy) provide superior health outcomes by leveraging complex, non-random mixtures of constituents.

Stop focusing on isolated nutrient supplements for chronic disease prevention. Instead, prioritize whole food patterns like the Mediterranean or Prudent diets. Look at the food matrix: saturated fat from dairy behaves differently than from meat. If you are not deficient in a specific nutrient (like Vitamin B12 or Folate for neural tube defects), adding isolated supplements may be ineffective or harmful. Focus on eating diverse, whole foods rather than trying to optimize individual chemical compounds.

Better self-reported sleep quality is associated with better mental health outcomes, specifically showing a U-shaped relationship where both short and long sleep durations correlate with higher depression and anxiety.

Prioritize sleep quality over just duration. If you are sleeping 7-9 hours but still experience high anxiety or depression, your sleep efficiency or continuity may be poor. This study suggests that poor sleep quality is strongly linked to mental health issues, regardless of age. Aim for consistent, efficient sleep rather than just time in bed, and be aware that both sleeping significantly less or significantly more than average can negatively impact mental well-being.

Poor sleep quality is modestly but consistently associated with poorer cognitive performance, particularly verbal phonemic fluency, across the entire adult lifespan (18-98 years).

Maintain good sleep hygiene throughout your life, not just as you age. This study shows that poor sleep quality consistently impacts cognitive performance, especially verbal fluency, from young adulthood to old age. Prioritizing sleep is a key strategy for maintaining cognitive health at any age.

Low levels of physical activity are associated with a significantly higher risk of incident dementia in older adults (aged 60+), specifically demonstrating a threshold effect where the lowest activity quintile faces increased risk compared to higher activity levels.

Maintain a baseline level of physical activity as you age to protect your brain. This study suggests that even modest activity (moving out of the 'lowest quintile' of inactivity) is protective against dementia, with the strongest benefits seen in those over 75. You do not need to be an elite athlete; simply avoiding a sedentary lifestyle and engaging in regular movement helps preserve brain volume and reduces dementia risk.

Higher levels of physical activity are linearly associated with larger total cerebral brain volume and hippocampal volume in older adults, suggesting a structural preservation mechanism.

Regular physical activity helps maintain the physical size of your brain, specifically the hippocampus, which is critical for memory. This structural preservation is observed linearly with activity levels, meaning more activity generally correlates with larger brain volume in older adults.

Weight loss achieved through exercise and weight loss achieved through calorie restriction produce comparable improvements in LDL particle size and VLDL mass, but exercise yields a significantly greater increase in HDL2 mass than diet when adjusted for equivalent weight loss.

If you are losing weight, combining exercise with calorie restriction is superior to dieting alone for improving your HDL (good) cholesterol profile. While both methods improve LDL particle size and VLDL levels equally for the same amount of weight lost, only exercise significantly boosts HDL2 mass beyond what weight loss alone achieves. Prioritize aerobic exercise (like running) alongside your dietary changes to maximize cardiovascular benefits.

Consumption of polyphenol-rich foods (e.g., fruits, vegetables, tea, cocoa) alters gut microbiota composition by promoting beneficial bacteria (Lactobacillus, Bifidobacterium) and inhibiting harmful pathogens, thereby reducing inflammation and improving metabolic health.

Increase your intake of polyphenol-rich foods such as berries, dark chocolate, green tea, and olive oil. These compounds feed beneficial gut bacteria like Lactobacillus and Bifidobacterium while inhibiting harmful ones. This process reduces inflammation and supports metabolic health, even if the polyphenols themselves are processed by gut bacteria rather than directly absorbed.

The Western diet, high in refined carbohydrates, saturated fats, and low in fiber, disrupts gut microbiota diversity and increases the risk of obesity, cardiovascular disease, and metabolic syndrome.

Avoid the Western diet pattern, which is high in refined carbs, saturated fats, and low in fiber. This diet is linked to obesity, cardiovascular disease, and metabolic syndrome. Instead, focus on whole foods, high fiber, and healthy fats to support gut health and reduce disease risk.

High-Intensity Interval Training (HIIT) is an essential component for enhancing endurance performance in athletes, though the optimal intensity distribution and specific prescription remain unclear.

For endurance athletes, HIIT is non-negotiable for performance gains, but you must balance it with moderate volume. Do not prescribe HIIT in isolation; integrate it into a broader program (pyramidal or polarized) to avoid overtraining. The exact type of HIIT (short vs. long intervals) should be periodized based on the specific sport and competition phase.

Postoperative sleep disturbances, characterized by fragmentation and loss of deep/REM sleep, significantly increase the risk of postoperative delirium, cardiovascular events, and delayed recovery.

Recognize that poor sleep after surgery is not just 'being tired' but a clinical risk factor for confusion (delirium) and heart issues. Advocate for sleep-promoting measures like minimizing night interruptions, using earplugs/eye masks, and discussing sleep aids with the medical team.