Browse the evidence

The magnitude of the acute satellite cell (SC) response to resistance exercise, specifically the expansion of type I fiber-associated SC between 24 and 72 hours post-exercise, positively correlates with the degree of skeletal muscle hypertrophy achieved following long-term resistance training.

If you want to maximize muscle growth from resistance training, focus on exercises that trigger a strong satellite cell response. This study suggests that the ability of your body to expand the satellite cell pool associated with type I muscle fibers in the 24-72 hours after a workout is a key predictor of how much muscle you will gain over time. This implies that recovery and the cellular environment post-workout are just as important as the workout intensity itself.

The expansion of the satellite cell pool associated with type II muscle fibers following long-term resistance training correlates with the degree of skeletal muscle hypertrophy.

Long-term resistance training leads to an expansion of the satellite cell pool, particularly in type II fibers, which is associated with greater muscle growth. This suggests that consistent training over weeks and months helps build a larger reservoir of stem cells, supporting larger muscle fibers.

Myostatin (MSTN) co-localization with satellite cells decreases acutely following resistance exercise but returns to baseline levels after long-term resistance training, suggesting MSTN regulation occurs at the whole muscle level rather than specifically at the satellite cell level during chronic adaptation.

While acute exercise reduces the presence of the muscle growth inhibitor Myostatin on satellite cells, this effect does not persist after long-term training. This suggests that long-term muscle growth is not driven by chronic MSTN inhibition at the satellite cell level, but rather by other mechanisms like myonuclear addition.

Ultra-processed foods contribute disproportionately to daily energy intake in high-income countries, often exceeding 50% of total calories.

Be aware that in many high-income countries, more than half of the calories consumed come from ultra-processed foods. Reducing this proportion is a key public health goal.

An increase in ABSI over time (rising ABSI) is associated with higher mortality risk, whereas a decrease or stability in ABSI is associated with lower risk, even when controlling for baseline ABSI.

Monitor how your Body Shape Index (ABSI) changes over time, not just its current value. If your ABSI is increasing, your mortality risk is rising, even if your baseline ABSI was moderate. Conversely, a decreasing or stable ABSI is associated with lower risk. This dynamic measure may be more informative than tracking BMI changes alone.

Web-based interventions targeting cardiovascular risk factors in middle-aged and older adults produce modest, statistically significant improvements in intermediate biomarkers (blood pressure, HbA1c, LDL, weight, physical activity), but these effects are smaller than those of traditional care and do not translate to a reduction in incident cardiovascular disease events.

If you are over 50 and have cardiovascular risk factors, using a web-based health program can help you lower your blood pressure, cholesterol, and weight, and get more active. However, the benefits are modest and tend to fade after a year unless you combine the online tool with regular support from a nurse or doctor. It is not a substitute for clinical care in preventing heart attacks or strokes, but it is a useful tool for managing risk factors.

Tirzepatide, a dual agonist of GLP-1 and GIP receptors, achieves significant body weight and glucose control in patients with obesity and type 2 diabetes.

Tirzepatide, which activates both GLP-1 and GIP receptors, is an effective treatment for obesity and type 2 diabetes, leading to significant improvements in body weight and glucose control. It represents a newer class of therapy with promising clinical results.

Short-term time-restricted feeding (8h window) alters the rhythmicity of serum lipids and muscle amino acids without perturbing core clock gene expression in skeletal muscle.

If you practice time-restricted feeding, expect changes in how your body processes fats and amino acids throughout the day, specifically by increasing the 'peaks' of certain metabolic signals in muscle. This happens even if your body's core biological clock genes remain unchanged. Focus on the timing of nutrient availability rather than trying to 'reset' your biology.

Implementing a 30% financial subsidy on fruits and vegetables through Medicare and Medicaid is highly cost-effective, preventing cardiovascular disease events and generating substantial quality-adjusted life years (QALYs).

For policymakers, subsidizing fruits and vegetables by 30% for Medicare and Medicaid recipients is a highly cost-effective strategy to improve public health. The model predicts significant reductions in cardiovascular disease and diabetes cases, leading to substantial long-term healthcare cost savings that offset the initial subsidy costs.

A 30% financial subsidy on a broader basket of healthful foods (including fruits, vegetables, whole grains, nuts, seafood, and plant oils) is more cost-effective than a fruit and vegetable-only subsidy, preventing more cardiovascular and diabetes cases.

For policymakers, expanding the subsidy to include whole grains, nuts, seafood, and plant oils alongside fruits and vegetables is even more cost-effective than subsidizing fruits and vegetables alone. This broader approach prevents more cases of cardiovascular disease and diabetes, resulting in greater long-term healthcare savings and lower cost-per-QALY ratios.

Multi-targeting agonists (tirzepatide and peptide 20) that activate GIPR, GLP-1R, and GCGR provide superior metabolic efficacy compared to GLP-1 mono-agonists (like semaglutide) by leveraging distinct structural binding modes and retaining glucagon receptor function.

For individuals managing Type 2 Diabetes or Obesity, newer multi-targeting therapies (like tirzepatide) that activate multiple metabolic receptors (GIP, GLP-1, and Glucagon) have demonstrated superior weight loss and glucose control compared to older GLP-1-only medications. This suggests that targeting multiple hormonal pathways simultaneously may offer better clinical outcomes than single-pathway treatments.

Suboptimal intake of specific dietary factors (nuts/seeds, seafood omega-3, processed meats, whole grains, vegetables, fruits, SSBs, sodium, red meat, polyunsaturated fats) accounts for 18.2% of total cardiometabolic disease costs in the US, totaling $50.4 billion annually.

Focus on increasing intake of nuts, seeds, and seafood omega-3s, and reducing processed meats, sodium, and sugar-sweetened beverages. These changes have the highest potential to reduce cardiometabolic disease risk and associated healthcare costs.

Low consumption of nuts/seeds and seafood omega-3 fats imposes the highest per capita cardiometabolic disease costs ($81 and $76 respectively), while high consumption of red meat and polyunsaturated fats imposes the lowest ($3 and $20 respectively).

Increase intake of nuts, seeds, and seafood omega-3s, as these changes offer the greatest potential to reduce cardiometabolic disease costs. Reduce processed meats and sodium, and increase polyunsaturated fats, though their individual impact is smaller.

Training with low muscle glycogen availability augments the activation of signaling proteins and the resulting phenotypic adaptations for mitochondrial biogenesis compared to training with normal glycogen.

If you want to maximize mitochondrial growth, you can try training with lower muscle glycogen. This might mean doing your workout before eating a large carb-heavy meal, or doing a second session later in the day when glycogen is depleted. This state of 'low fuel' signals your body to build more mitochondria more aggressively than when you are fully fueled. However, this may reduce your performance output during the workout itself.

Adherence to a Mediterranean diet prevents long-term weight gain and abdominal obesity in individuals who are normal weight at baseline, but does not reverse existing overweight or obesity.

If you are currently a healthy weight, adopting a Mediterranean diet pattern is a strong strategy to prevent future weight gain and belly fat accumulation. However, if you are currently overweight or obese, this diet pattern alone is unlikely to result in significant weight loss or BMI normalization; you likely need to combine it with other interventions like caloric restriction or increased physical activity.

The proportion of fat-free mass lost during weight reduction increases with the magnitude of the weight loss, meaning large weight losses (such as those from bariatric surgery) result in a disproportionately higher loss of lean tissue compared to modest weight losses.

If you are losing a large amount of weight (e.g., through bariatric surgery or extreme dieting), expect to lose a higher proportion of your lean muscle mass compared to someone losing a small amount of weight. This is a physiological reality of large energy deficits, not necessarily a failure of your effort. Monitoring body composition rather than just scale weight is crucial to accurately assess progress in these scenarios.

In free-living humans, increased physical activity triggers energy compensation, where basal metabolic rate (BEE) decreases such that only ~72% of the calories burned through activity translate into increased total energy expenditure (TEE).

When you exercise, your body naturally lowers your resting metabolism to save energy. On average, you only get 72% of the 'extra' calories burned from exercise added to your total daily burn. This doesn't mean exercise is bad, but it means you cannot simply 'eat back' all the calories you burned. Weight loss requires managing intake, as exercise alone faces a biological ceiling due to this compensation.

The degree of energy compensation increases with body fat mass (FM), with individuals at the 90th percentile of BMI compensating ~49% of activity calories compared to ~28% for those at the 10th percentile.

If you have higher body fat, your body will likely compensate more strongly for exercise by lowering your resting metabolism. This means exercise alone will be less effective for weight loss in higher-fat individuals. To lose weight, you likely need to combine exercise with dietary changes to create a deficit that overcomes this higher compensation rate.

The efficacy of the vegetable consumption app is moderated by baseline vegetable intake; users with higher baseline consumption benefit significantly more from the intervention.

If you already eat a decent amount of vegetables, a tracking app will likely boost your intake even more than if you eat few vegetables. The app's gamification resonates more with those who already value vegetables.

SSB intake is inversely correlated with national Socio-demographic Development Index (SDI) by 2018, meaning higher national development is associated with lower national SSB intake, though within lower-SDI nations, higher individual education correlates with higher intake.

If you are in a developing nation, be aware that SSB marketing often targets the educated and urban demographics. High individual education does not protect against high SSB intake in these regions; in fact, it may correlate with higher intake.

SSB intake is significantly higher in urban vs. rural areas globally (57.3% higher), with the largest disparities in Sub-Saharan Africa and South Asia, while being lower in urban areas of the Middle East/North Africa.

Urban dwellers, particularly in Africa and Asia, face higher exposure to SSBs. Focus on reducing availability and marketing in these high-density areas.

Warm-ups should be restricted to exercise-specific movements, and stretching should only be prioritized if the goal is to increase flexibility.

Skip generic warm-ups and static stretching unless you want more flexibility. Instead, do a few light sets of your specific exercises to warm up.

Higher BMI causally increases the risk of coronary heart disease (CHD), and this effect is significantly mediated by elevated triacylglycerol levels, higher HbA1c, and type 2 diabetes risk.

High body weight increases heart disease risk, but much of that risk comes from how it affects your blood fats (triglycerides) and blood sugar (HbA1c/Diabetes). Managing these specific metabolic markers is crucial for heart health, potentially more so than focusing on LDL cholesterol alone, which this study suggests isn't a primary mediator of BMI's effect.

Bariatric surgery reverses obesity-associated secondary hypogonadism (MOSH) in men, leading to increased total and free testosterone levels and improved sexual function.

If you are a severely obese man with low testosterone, bariatric surgery can naturally restore your hormone levels and sexual function by reversing the obesity that was suppressing your hormones.