Browse the evidence

The protective effect of whole-grain/cereal fiber against cardiovascular disease and diabetes may be partially due to increased vegetable protein content (higher protein-to-carbohydrate ratio) and other whole-grain components, rather than fiber alone.

When choosing whole grains, look for options with higher protein content (like wheat bran or specific whole-grain products). The health benefits of whole grains may come from a combination of fiber and protein, not just fiber alone.

Vitamin D supplementation is indicated for older adults with low levels (<30 ng/mL) to combat sarcopenia, functional decline, and falls risk, with Vitamin D3 (cholecalciferol) being the preferred form.

If you are older, ask your doctor to check your Vitamin D levels. If they are low (below 30 ng/mL), supplementation is recommended to help prevent muscle loss and falls. Use Vitamin D3 (cholecalciferol) supplements, as they are more effective than D2. Sun exposure is often insufficient due to age-related skin changes.

Weight cycling is associated with increased psychopathology, lower life satisfaction, and a higher risk of binge eating and disturbed eating practices.

Be aware that repeated dieting can lead to psychological distress and binge eating. If you find yourself cycling, consider focusing on sustainable lifestyle changes rather than extreme diets to protect your mental health.

Weight cycling may alter body fat distribution, specifically increasing the waist-hip ratio (WHR) in women, which is a risk factor for coronary heart disease.

If you are a woman who has experienced weight cycling, be aware that it may lead to increased abdominal fat (higher waist-hip ratio), which is a risk factor for heart disease. Focus on maintaining a healthy weight and body composition.

Repeated Sprint Training in Hypoxia (RSH) improves repeated sprint ability (RSA) and delays fatigue in team-sport athletes, unlike IHT.

If you play a team sport requiring repeated high-intensity efforts, try Repeated Sprint Training in Hypoxia (RSH). Perform 6-10 second all-out sprints with short, incomplete rest periods (e.g., 20-30 seconds rest) in a hypoxic environment (or use a mask/tent if available). This improves your ability to repeat sprints and delays fatigue during games.

Smoking cessation in elderly patients who have suffered a stroke or acute myocardial infarction significantly reduces the risk of recurrent cardiovascular events, with risk levels approaching those of non-smokers after approximately 3 years.

If you smoke, quitting is the single most effective step you can take to protect your heart, especially after a heart attack or stroke. You do not need to wait until you are 'ready'; the benefits start immediately and your risk of another event drops to the level of a non-smoker within three years. Seek support to quit, as the cardiovascular payoff is substantial and time-bound.

In normal-weight young women, higher body fat percentage, lower dietary restraint, and sedentary behavior are independent predictors of lower insulin sensitivity (higher HOMA), defining the metabolically obese normal-weight (MONW) phenotype.

If you have a normal BMI but high body fat or low muscle mass, you may still be at risk for metabolic issues like insulin resistance. Focus on building muscle and staying active rather than just watching the scale. Additionally, maintaining a balanced, conscious approach to food (without extreme restriction or neglect) may support better metabolic health.

COVID-19 home confinement led to significant weight gain in 38.8% of the Spanish population, with higher BMI and older age being positive predictors of this weight increase.

If you are older or overweight, be aware that lockdown makes weight gain more likely. Focus on maintaining your current activity level and monitoring portions, as these are the strongest predictors of staying stable.

Emotional eating, particularly the inability to stop eating sweets or eating when stressed, is strongly associated with greater weight gain during confinement.

If you eat when stressed or can't stop sweets, you are at higher risk for weight gain during stressful periods. Develop non-food coping strategies for stress to protect your weight.

In obese patients with Alcohol Use Disorder (BMI > 30 kg/m2), exenatide significantly reduces heavy drinking days and total alcohol intake.

If you have Alcohol Use Disorder and are obese (BMI > 30), weekly exenatide injections may significantly reduce your heavy drinking days and total alcohol intake. This benefit was not seen in non-obese patients in this study, suggesting that metabolic health is a key factor in the drug's efficacy for addiction.

High-fat dairy products are associated with less weight gain, contrary to the assumption that high fat intake promotes obesity.

Include high-fat dairy products in your diet. They are associated with less weight gain, possibly due to calcium, protein, or biopeptides.

Walking 10,000 steps per day or more for 12 weeks significantly lowers systolic and diastolic blood pressure and reduces sympathetic nerve activity in patients with mild essential hypertension, irrespective of exercise intensity or duration.

If you have mild high blood pressure, aim to walk at least 10,000 steps every day for 12 weeks. You do not need to walk fast or for long periods at a time; just hit the step count. This approach has been shown to lower blood pressure and reduce stress on your heart's nervous system, even if your weight or cholesterol doesn't change immediately.

Vitamin D deficiency is a major risk factor for osteoporosis and osteomalacia, but the efficacy of Vitamin D supplementation alone in preventing fractures is controversial and may be insufficient without adequate Calcium intake.

For bone health, Vitamin D and Calcium work together. If you are at risk for osteoporosis, ensure your Vitamin D levels are optimized (via testing and supplementation if needed) before relying solely on Calcium supplements. High-dose Vitamin D (>792 IU/day) may help reduce hip fracture risk, but Calcium alone may not be effective and could have adverse effects in postmenopausal women.

Activation of beige adipose tissue (browning of white fat) improves glucose homeostasis and insulin sensitivity, offering a therapeutic mechanism for type 2 diabetes.

You can potentially improve your metabolic health by encouraging your body to create 'beige fat' within your white fat stores. This happens naturally through exposure to cold temperatures and regular exercise. While you cannot directly 'eat' beige fat, these lifestyle factors trigger the browning process, which helps clear glucose and lipids from your blood, thereby improving insulin sensitivity.

Antioxidant supplements (zinc, lipoic acid, carnitine, cinnamon, green tea, and possibly vitamin C plus E) provide only marginal benefits for managing obesity and type 2 diabetes, whereas antioxidant-rich foods are recommended as part of a healthy lifestyle.

Do not rely on antioxidant supplements to fix obesity or diabetes. The evidence shows only marginal benefits for specific supplements like zinc, lipoic acid, and carnitine. Instead, focus on consuming antioxidant-rich whole foods (fruits, vegetables, nuts) as part of a broader lifestyle that includes weight management and exercise. Supplements are not a substitute for these foundational habits.

Lipoic acid supplementation (300-1800 mg/day) may improve glycemic control, insulin sensitivity, and weight loss in obese or diabetic patients, but effects are marginal and may be negated without concurrent exercise.

If you choose to use lipoic acid for diabetes or obesity, expect only marginal benefits. Studies used doses between 300mg and 1800mg daily. Crucially, do not take it without exercise, as one study suggested it might worsen LDL atherogenicity in sedentary obese individuals. Combine it with physical activity for potential improvements in insulin sensitivity and modest weight loss.

Zinc supplementation improves fasting blood glucose, postprandial plasma glucose, and lipid profiles in diabetic patients, with potentially greater benefits for those who are poorly controlled or overweight.

Consider zinc supplementation if you have diabetes, especially if you are overweight or your blood sugar is not well-controlled by medication. A meta-analysis suggests it can improve fasting blood glucose and lipid profiles. However, the benefits are likely marginal compared to standard care and lifestyle changes.

Carnitine supplementation (L-Carnitine) provides marginal benefits for body weight, glycemic control, and lipid profiles in diabetic patients, particularly when combined with other medications like orlistat or sibutramine.

L-Carnitine supplementation offers only marginal benefits for weight loss and glycemic control in diabetic patients. It is often studied in combination with other medications like orlistat or sibutramine. Do not expect significant results from carnitine alone; focus on standard diabetes management and lifestyle changes.

Higher adherence to a Mediterranean-style dietary pattern is associated with better lower extremity functioning, mobility, and walking speed in older adults, but shows inconclusive or no association with measures of muscle strength (e.g., grip strength).

For older adults, prioritizing a Mediterranean-style diet (high in plants, olive oil, fish, moderate dairy/wine) is strongly linked to maintaining mobility, walking speed, and independence. However, do not expect this diet alone to significantly increase muscle strength (grip strength); resistance training remains essential for building strength, while this diet supports functional mobility.

Daily oral supplementation of 200 µg selenium and 400 IU vitamin E for 14 weeks significantly improves sperm motility and morphology in men with idiopathic asthenoteratospermia.

For men with unexplained low sperm motility (asthenoteratospermia), a daily regimen of 200 mcg selenium and 400 IU vitamin E taken for at least 14 weeks may improve sperm movement and shape. This is not a cure-all for all infertility types and requires medical diagnosis to rule out other causes.

The body's vastly larger capacity for fat storage compared to carbohydrate storage dictates that higher dietary fat fractions lead to higher steady-state adiposity, as the system prioritizes maintaining glycogen levels over fat levels.

If you eat a diet high in fat, your body will likely settle at a higher body fat level than if you ate a diet lower in fat, even if you eat the same number of calories. This is because your body prioritizes keeping your glycogen (carbohydrate) stores stable. To lower your steady-state body fat, you may need to reduce the proportion of fat in your diet, not just the total calories.

During COVID-19 peak-lockdown periods, US adults experienced significant longitudinal weight gain (mean +0.62 kg) driven by increased consumption of ultra-processed foods, frequent snacking, higher takeout frequency, and reduced physical activity, with these behavioral disruptions persisting for many individuals even after lockdown restrictions eased.

If you gained weight during lockdown, don't assume it will disappear once restrictions end. The study shows that risky habits like eating more ultra-processed foods, snacking frequently, and ordering takeout often persist. To reverse this, you must actively address the root causes: manage stress, improve craving control, and consciously reduce intake of processed foods and screen time, as these behaviors are linked to continued weight gain even after the pandemic context changes.

Increasing the proportion of animal-based protein in cereal-dominated diets significantly improves nutritional status by providing complete essential amino acids and enhancing the bioavailability of critical minerals like iron and zinc.

If you live in a region where meat is expensive or culturally reserved, prioritize adding small amounts of animal products (meat, milk, eggs) to your staple cereal/legume meals. This improves the quality of protein you get and helps your body absorb iron and zinc from your food. Focus on local, indigenous livestock breeds which are often more sustainable and affordable.

Poor sleep quality is significantly associated with higher levels of depression, anxiety, and stress in medical students.

If you are a medical student, recognize that poor sleep is linked to higher anxiety and depression. While some high achievers sleep poorly, this comes with a mental health cost. Prioritizing sleep quality may help manage stress levels.