Browse the evidence

Retraining after long-term detraining (30-32 weeks) induces rapid hypertrophy of fast-twitch muscle fibers (Type IIa and IIab+IIb) and a shift in fiber type composition from IIb to IIa, occurring faster than in untrained individuals.

When returning to lifting after a long break, your fast-twitch muscle fibers will grow quickly, and your muscle fibers will shift towards more oxidative (IIa) profiles. This structural change happens rapidly, contributing to the speed at which you regain strength.

For South Asian, Chinese, and Black populations, the BMI threshold associated with equivalent diabetes risk is significantly lower (24-26 kg/m²) than the standard 30 kg/m² cutoff used for White populations.

If you are South Asian, Chinese, or Black, do not wait until you reach a BMI of 30 to worry about diabetes. Your risk increases at lower weights (24-26 kg/m²). You should undergo diabetes screening and adopt preventive lifestyle measures at these lower BMI thresholds, as your body may store fat in ways that increase metabolic risk more efficiently than in White populations.

Increased intake of EPA and DHA lowers the risk of coronary heart disease and cardiovascular mortality, primarily through the modification of risk factors such as triglycerides, blood pressure, and inflammation, as well as through anti-arrhythmic and anti-thrombotic mechanisms.

To support heart health, aim for higher intakes of EPA and DHA, ideally through fatty fish consumption or supplements. This is associated with lower risks of coronary heart disease and cardiovascular mortality. Key benefits include lowering triglycerides, blood pressure, and inflammation. While recent studies have been mixed, the overall body of evidence supports a protective role, especially for secondary prevention in those with existing heart disease.

When eccentric and concentric resistance training are matched for maximum load or total work, they produce similar increases in whole muscle size (hypertrophy), despite inducing distinct structural adaptations.

If your goal is maximum muscle size, you do not need to prioritize eccentric-only training. As long as you match the total work or the load used in concentric training, eccentric training will build similar muscle mass. However, expect different structural changes: eccentric training tends to increase fascicle length (muscle belly length), while concentric training tends to increase pennation angle (fiber packing density). For general hypertrophy, either mode works if the stimulus is matched.

Eccentric resistance training primarily increases muscle fascicle length (serial sarcomere addition), whereas concentric resistance training primarily increases pennation angle (parallel sarcomere addition).

To optimize specific functional goals, consider the structural changes: eccentric training lengthens the muscle fibers (fascicles), which may improve range of motion and force at longer lengths. Concentric training packs fibers more densely (pennation), which may improve force production at shorter lengths. For general aesthetics, either works, but for sport-specific range of motion, eccentric emphasis might be beneficial.

Consumption of phytosterol esters (approx. 1.84 g/day) lowers plasma total and LDL cholesterol more effectively than phytostanol esters at the same dose, primarily by suppressing cholesterol absorption.

To lower cholesterol, choose margarines or spreads enriched with phytosterol esters over those with phytostanol esters. Aim for a daily intake of approximately 1.8-2 grams of free sterol content, typically achieved by consuming 2-3 servings of the fortified product daily. This intervention is most effective for individuals with elevated cholesterol levels.

Integrating sleep, sedentary behavior, light-intensity physical activity (LIPA), and moderate-to-vigorous physical activity (MVPA) into a unified 24-hour activity cycle (24-HAC) provides a more accurate assessment of health outcomes than evaluating these activities in isolation, as time spent in one activity directly displaces time in others and creates physiological synergies.

Stop viewing exercise in a vacuum. Your health is determined by how you spend all 24 hours. Prioritize getting 7+ hours of sleep, as this is the foundation. Then, look at your waking hours: minimize prolonged sitting by standing or moving lightly (LIPA) frequently, and aim for 150 minutes of moderate-to-vigorous activity per week. Recognize that moving more during the day can help you sleep better, and sleeping better gives you the energy to move more.

Low muscle strength (dynapenia) is independently and significantly associated with increased all-cause mortality in older adults, whereas low muscle mass (sarcopenia) alone is not significantly associated with mortality unless accompanied by low muscle strength.

For adults over 50, prioritize building and maintaining muscle strength (e.g., through resistance training) over simply focusing on muscle size or weight. Low strength is a strong independent predictor of early death, whereas having low muscle mass is not a significant risk factor if your strength remains normal. Measure your functional capacity, not just your body composition.

DASH and Mediterranean diets reduce systemic inflammation (e.g., hs-CRP, cytokines), which indirectly attenuates neuroinflammation and neurodegeneration.

Focus on reducing systemic inflammation by following anti-inflammatory dietary patterns like DASH or Mediterranean. This helps protect the brain by lowering inflammatory markers like CRP and cytokines.

Sleep problems are significantly associated with higher levels of psychological distress (anxiety and depression) across healthcare professionals, the general population, and COVID-19 patients.

If you are experiencing sleep problems during a high-stress period, recognize that this is strongly linked to increased anxiety and depression. Prioritizing sleep hygiene or seeking treatment for sleep issues is not just about rest; it is a critical step in mitigating psychological distress. Treating sleep problems may help reduce psychological distress, and vice versa.

The prevalence of sleep problems is highest among COVID-19 patients (57%), followed by healthcare professionals (31%), and the general population (18%).

Target sleep interventions should prioritize COVID-19 patients and healthcare workers, as they face the highest risk of sleep disruption. For the general public, sleep issues are less prevalent but still significant (1 in 5 people).

Dietary composition (specifically carbohydrate vs. animal fat/protein intake) shapes gut microbiota enterotypes (Prevotella vs. Bacteroides dominance), which in turn influences host health outcomes including inflammation, metabolic disease risk, and immune function via microbial metabolite production.

Focus on the quality and type of carbohydrates and fats in your diet, as these directly shape your gut bacteria. A diet high in fiber/carbs may favor Prevotella, while high animal fat/protein may favor Bacteroides. These shifts affect your inflammation and metabolic health. Personalized nutrition based on your microbiome may be more effective than universal dietary guidelines.

An increase in the proportion of ultraprocessed foods in the diet is associated with a higher risk of all-cause mortality in middle-aged adults.

To lower your risk of early death, try to reduce the percentage of your diet that comes from ultraprocessed foods (like packaged snacks, sugary drinks, and ready meals). Even a small reduction in these items can have a measurable positive impact on your longevity.

High intake of simple carbohydrates (sucrose, fructose) causes rapid deregulation of gut microbiota composition, leading to metabolic dysfunction, whereas complex carbohydrates (fiber, resistant starch) promote beneficial bacteria (Bifidobacterium, Lactobacillus) and short-chain fatty acid (SCFA) production, supporting metabolic health.

Focus on complex carbohydrates like vegetables, whole grains, and legumes rather than sugary foods. Aim for about 30g of fiber daily to support gut bacteria that produce beneficial compounds for your metabolism.

High intake of saturated fatty acids (SFA) promotes gut dysbiosis characterized by increased bile-tolerant anaerobes (Bilophila) and inflammation, whereas polyunsaturated fatty acids (PUFA) support a healthier microbiota profile with higher diversity and beneficial bacteria.

Prioritize sources of unsaturated fats (like nuts, fish, olive oil) over saturated fats (like butter, fatty meats). This shift supports a more diverse and healthy gut microbiome.

Heavy resistance training induces region-specific hypertrophy (increased cross-sectional area) in the human patellar tendon, specifically at the proximal and distal regions, while the mid-tendon remains unchanged.

If you perform heavy resistance training (e.g., heavy leg extensions), your patellar tendons will physically grow thicker at the ends (near the knee and shin bones) over 12 weeks. This structural change may help protect the tendon from injury by distributing force more effectively, even if the middle part of the tendon doesn't change size.

Heavy resistance training increases patellar tendon stiffness without changing the tendon modulus (material property), suggesting structural hypertrophy rather than just material stiffening.

Heavy training makes your tendons stiffer, but this is a good adaptation. It happens because the tendon gets thicker (hypertrophy), not because the material itself changes quality. This thicker, stiffer tendon handles load better and may be less prone to injury.

A gut microbiota-targeted dietary intervention (WTP diet) comprising whole grains, traditional Chinese medicinal foods, and prebiotics reduces chronic low-grade inflammation and improves metabolic syndrome markers in central obese adults by modulating gut microbiota composition, enhancing intestinal barrier integrity, and reducing circulating endotoxin load.

Adopt a diet rich in whole grains, prebiotics, and specific functional foods (like bitter melon and adlay) to support gut health. This specific combination (WTP diet) was shown to reduce weight, improve insulin sensitivity, and lower inflammation markers in obese individuals by improving gut barrier function and reducing harmful bacteria. The protocol involves specific ready-to-use formulas for 9 weeks, followed by a maintenance phase emphasizing high-fiber home-cooked meals.

Consumption of fish (2-4 servings/week or more) is moderately associated with a reduced risk of cerebrovascular disease (stroke).

Aim to eat fish 2-4 times per week to potentially lower your risk of stroke. Focus on the whole food rather than relying on supplements, as the combination of nutrients in fish appears to drive the benefit.

Long-term pharmacotherapy with orlistat, sibutramine, or rimonabant produces modest but statistically significant weight loss (approx. 3-5 kg) compared to placebo in adults with obesity or overweight.

If you have obesity or overweight with related health issues, long-term medication (orlistat, sibutramine, or rimonabant) combined with lifestyle changes can help you lose a modest amount of weight (3-5 kg) compared to doing nothing. This small loss is clinically beneficial for your health, even if it doesn't solve obesity entirely.

Orlistat reduces the incidence of type 2 diabetes and improves cardiovascular risk factors (lipids, blood pressure, glycaemic control) in patients with diabetes, despite increasing gastrointestinal side effects.

If you have diabetes or high cardiovascular risk, orlistat can help lower your risk of developing more diabetes and improve your cholesterol and blood pressure. Be prepared for potential gastrointestinal side effects, which are common but often manageable.

Sibutramine improves lipid profiles (HDL, triglycerides) but increases blood pressure and heart rate, while rimonabant improves lipid profiles and glycaemic control but increases the risk of mood disorders.

Sibutramine and rimonabant can improve your cholesterol and blood sugar, but they come with specific risks: sibutramine raises blood pressure and heart rate, while rimonabant increases the risk of mood disorders. Your doctor will screen you to ensure these risks are manageable.

Individual characteristics such as fitness, body composition, injury history, and age significantly impact internal training loads and susceptibility to injury/illness.

Don't copy your teammate's load. Your injury history, age, and fitness level mean you have a unique tolerance. Use personal data to guide your training, not others'.

The Ketogenic Diet alters gut microbiota composition, increasing beneficial bacteria like Akkermansia and Parabacteriodes, which contributes to anti-seizure and anti-inflammatory effects.

Following a ketogenic diet changes your gut bacteria, increasing beneficial types like Akkermansia and reducing harmful ones. This shift is linked to reduced inflammation and seizure activity. You don't need to take probiotics; the diet itself drives these positive changes.