Browse the evidence

High fitness levels attenuate mortality risk in obese individuals, making it more beneficial to be fit and overweight than normal weight and unfit.

Do not let your weight stop you from exercising. Improving your fitness (cardiovascular capacity) significantly lowers your mortality risk, even if you are obese. It is better to be a fit overweight person than an unfit normal-weight person. Focus on building fitness through regular activity.

Oral administration of berberine requires gut microbiota-mediated conversion to dihydroberberine (dhBBR) for effective intestinal absorption; without this microbial conversion, berberine bioavailability and therapeutic efficacy are significantly reduced.

Berberine's effectiveness depends on your gut health. It is not absorbed directly; your gut bacteria must first convert it into dihydroberberine. If you are taking antibiotics or have gut dysbiosis, berberine may not work well because this conversion process is impaired. Maintaining a healthy gut microbiome is essential for berberine to function as intended.

High adherence to a Mediterranean dietary pattern reduces overall cancer risk by approximately 4% per two-point increment in adherence score.

Adopting a Mediterranean-style diet, characterized by high intake of vegetables, fruits, legumes, cereals, fish, and unsaturated fats, with low intake of meat and dairy, is associated with a modest but significant reduction in overall cancer risk. This benefit appears particularly strong for cancers linked to smoking. While the absolute risk reduction is around 4%, it is comparable to other established lifestyle factors like obesity and alcohol consumption.

The protective effect of the Mediterranean diet is significantly stronger for smoking-related cancers than for non-smoking-related cancers.

If you smoke, adopting a Mediterranean diet may offer you greater protection against cancer than if you were a non-smoker, particularly for cancers like lung, bladder, and colorectal. The diet's antioxidants may help counteract the oxidative damage caused by smoking.

Olive polyphenols improve cardiovascular health by reducing lipid peroxidation, inhibiting atherosclerosis, lowering cholesterol and triglycerides, and improving post-prandial vascular function.

Use extra virgin olive oil as your primary cooking fat. It helps protect your heart by reducing inflammation, improving cholesterol profiles, and protecting blood vessels.

In low- and middle-income countries, obesity trends are characterized by a disproportionate increase in BMI at the upper end of the distribution (rightward shift) and an increase in waist circumference at any given BMI level, leading to higher cardiometabolic risk than BMI alone suggests.

If you live in or are analyzing data from a low- or middle-income country, standard BMI metrics may underestimate health risks. Focus on waist circumference as a key indicator of cardiometabolic risk, as visceral fat accumulation is increasing even among those with stable BMI. This shift suggests a growing burden of metabolic disease that current BMI-based estimates may miss.

In older adults, a high Weight-Adjusted Waist Index (WWI) is a valid indicator of sarcopenic obesity, characterized by simultaneously high fat mass and low muscle mass.

For older adults, standard BMI or waist size can hide dangerous muscle loss. Use the Weight-Adjusted Waist Index (WWI): divide your waist circumference (cm) by the square root of your weight (kg). A higher WWI score indicates a higher risk of having both excess fat and low muscle (sarcopenic obesity), which is a critical health risk factor in aging.

Adhering to the American Heart Association's Ideal Cardiovascular Health (CVH) score (non-smoking, ideal BMI, regular physical activity, healthy diet, optimal cholesterol, blood pressure, and glucose) is inversely associated with the incidence of cardiovascular disease (CVD).

Adopt the AHA's 7 metrics for cardiovascular health: do not smoke, maintain an ideal body mass index, engage in regular physical activity, eat a healthy diet, and keep your cholesterol, blood pressure, and blood glucose in optimal ranges. You do not need to be perfect in all areas to benefit; each improvement lowers your risk of cardiovascular disease. The study shows a linear benefit, meaning even small improvements in these areas contribute to a lower incidence of heart disease and stroke over time.

High consumption of ultra-processed foods (UPF) significantly increases the risk of developing overall and abdominal obesity in adults, independent of baseline adiposity.

If you eat a lot of ultra-processed foods (like packaged snacks, sugary drinks, and ready meals), you are significantly more likely to gain weight and develop obesity over time. This risk exists even if you don't currently have obesity. Reducing your intake of these highly processed items is a key strategy for weight management.

Concurrent strength and endurance training results in attenuated muscle hypertrophy compared to resistance training alone due to molecular competition between myofibrillar protein synthesis and mitochondrial biogenesis pathways.

If your goal is maximum muscle size, prioritize resistance training and minimize long-duration steady-state cardio, or separate them by at least 6 hours. If your goal is maximum endurance, prioritize running/cycling and limit heavy resistance training volume. Trying to do both at high intensities simultaneously will result in suboptimal gains for both due to conflicting molecular signals (mTOR vs AMPK).

Consuming red and processed meat at an average level of 76 g/day, which meets current UK government recommendations, is associated with a 20% higher risk of colorectal cancer compared to consuming 21 g/day.

If you eat red or processed meat, aiming for less than 76 grams per day may lower your colorectal cancer risk compared to eating around 76 grams or more. While 76g meets current UK guidelines, this study links that amount to a 20% higher risk compared to eating only 21g. Consider reducing portion sizes or frequency of red/processed meat to lower this risk.

Higher intake of fiber from bread and breakfast cereals is associated with a 14% lower risk of colorectal cancer.

Eating more fiber from bread and breakfast cereals is linked to a lower risk of colorectal cancer. Aim to include whole grain bread and cereals in your diet to increase fiber intake.

Probiotics (specifically Lactobacillus acidophilus) are effective for preventing pediatric antibiotic-associated diarrhea, necrotizing enterocolitis in preterm infants, and upper respiratory tract infections, and for treating acute infectious and persistent diarrhea in children.

If you are treating a child with antibiotic-associated diarrhea, acute infectious diarrhea, or are a preterm infant at risk for necrotizing enterocolitis, probiotics (like L. acidophilus) are a valid, evidence-based intervention. However, do not rely on them to treat chronic conditions like Crohn's, ulcerative colitis, or bacterial vaginosis, as current evidence does not support their efficacy for these issues.

Food insecurity in college students is significantly associated with higher odds of poor sleep quality, high perceived stress, disordered eating behaviors, and lower academic performance (GPA < 3.0).

If you are a student struggling with food access, recognize that this likely impacts your sleep, stress levels, and grades. Prioritize securing consistent nutrition. If your campus has a food pantry, use it despite any stigma, as it is designed to help you succeed academically and health-wise.

Exercise intensity exceeding Critical Power (severe-intensity domain) causes fatigue through the attainment of a consistent, limiting muscle metabolic milieu (low pH, low PCr, high lactate), whereas fatigue at lower intensities (heavy/moderate) is constrained by substrate availability (glycogen depletion) and limitations to muscle activation rather than this specific metabolic threshold.

To optimize performance, recognize that exercising above your Critical Power (CP) triggers a specific metabolic failure (acidosis, phosphocreatine depletion) that limits tolerance to a consistent threshold regardless of exact workload. Below CP, fatigue is driven by different factors like glycogen use. Therefore, pacing strategies must account for this non-linear shift in fatigue mechanisms; you cannot simply scale up moderate-intensity endurance tactics to severe-intensity efforts.

Dietary intake of nondigestible carbohydrates (resistant starch, prebiotics) directly influences the species composition and total numbers of the human colonic microbiota.

To change your gut bacteria, you must eat nondigestible carbohydrates like resistant starch and prebiotics. These feed specific bacteria that produce beneficial metabolites. If you don't see changes, you might lack the specific bacteria needed to process these foods, but the potential for change exists.

Increased dietary fiber intake lowers colonic pH, which selectively suppresses Bacteroides spp. and promotes butyrate-producing gram-positive bacteria.

Eating more fiber not only feeds good bacteria directly but also creates an acidic environment in the gut that favors beneficial bacteria and suppresses others.

Exercise-induced production of reactive species (ROS) acts as a necessary signaling mechanism that triggers beneficial physiological adaptations, including angiogenesis, mitochondrial biogenesis, and muscle hypertrophy, rather than solely causing damage.

Do not fear the 'burn' or oxidative stress from exercise; it is the signal your body needs to build better blood vessels, more energy-producing mitochondria, and stronger muscles. You do not need to neutralize this stress with high-dose antioxidants, as doing so might prevent these adaptations.

Pre-rolling with foam rollers provides a small but statistically significant improvement in sprint performance (+0.7%) and flexibility (+4.0%), while having negligible effects on jump and strength performance.

Use foam rolling as a warm-up before sprinting or activities requiring high flexibility. Expect small gains in speed (approx 0.7%) and range of motion (approx 4%). Do not expect it to boost your max lift or vertical jump. If you are a recreational athlete, these small gains might be negligible; if you are elite, they may be worthwhile.

Post-rolling (post-exercise foam rolling) slightly attenuates exercise-induced decreases in sprint and strength performance and reduces perceived muscle pain, but has trivial effects on jump performance recovery.

Use foam rolling after workouts to help manage muscle soreness and slightly preserve your sprint and strength capabilities for subsequent sessions. Do not expect it to restore your vertical jump or max strength quickly. It is a useful tool for comfort and minor performance preservation, not a magic recovery bullet.

Regular consumption of non-soya pulses significantly reduces fasting serum triacylglycerol levels.

Adding pulses to your diet not only helps cholesterol but can also significantly lower triglycerides, another key marker for heart health. Aim for daily inclusion of beans, lentils, or peas.

In patients with chronic low back pain, stabilisation training combined with dynamic-static resistance training (incorporating a 5-second static hold between concentric and eccentric phases) significantly increases the cross-sectional area of the lumbar multifidus muscle, whereas stabilisation training alone or stabilisation combined with pure dynamic resistance does not.

If you have chronic back pain and multifidus atrophy, gentle stabilisation exercises or standard dynamic lifting alone will not rebuild the muscle. You need a specific protocol: combine stabilisation with resistance training at 70% of your one-rep max, performing 15-18 reps, but crucially, insert a 5-second static hold between the lifting and lowering phases. This 'dynamic-static' approach is required to trigger hypertrophy in the deep back muscles.

Higher cardiorespiratory fitness (VO2peak) significantly reduces the risk of fatal and non-fatal cardiovascular events in men, independent of conventional risk factors such as smoking, hypertension, and lipid profiles.

Get your cardiorespiratory fitness measured via a maximal exercise test (VO2peak). This single metric is one of the strongest predictors of your heart disease risk, potentially more important than your cholesterol or blood pressure numbers. If your fitness is low, especially if you have other risk factors, prioritize increasing your aerobic capacity through training to significantly lower your risk of fatal and non-fatal cardiac events.

In older women, objectively measured poor sleep (short/long duration, high fragmentation, or excessive napping) is associated with significantly worse neuromuscular performance and higher odds of functional limitations.

For older women, maintaining sleep between 6 and 7.5 hours and minimizing nighttime awakenings is crucial for preserving walking speed and the ability to perform daily tasks like standing from a chair. Excessive daytime napping (over 1 hour) is also linked to functional limitations. Prioritizing consolidated nighttime sleep over long naps may help preserve physical independence.