Browse the evidence

A ketogenic diet (KD) improves glycemic control and insulin sensitivity in patients with Type 2 Diabetes Mellitus (T2DM) by reducing carbohydrate intake, lowering serum insulin, and enhancing fat catabolism.

For T2DM patients, adopting a ketogenic diet can significantly lower blood sugar and HbA1c levels compared to standard low-calorie diets. This is achieved by restricting carbohydrates, which lowers insulin levels and improves insulin sensitivity. However, medical supervision is critical, especially if you are taking insulin or SGLT2 inhibitors, to avoid dangerous side effects like hypoglycemia or ketoacidosis.

Metabolic and fitness adaptations gained from exercise are rapidly lost within days to weeks of inactivity, but can be restored upon resuming normal activity.

If you stop exercising, you will lose your fitness quickly. However, when you start exercising again, your fitness will return to where it was. Try to maintain some level of activity to avoid the loss.

Lifestyle interventions combining calorie restriction and moderate-intensity exercise are the primary recommended treatment for NAFLD, with weight loss of >7% body weight improving NASH histology and ~10% weight loss leading to fibrosis regression in 45% of patients.

Focus on losing 7-10% of your body weight through a combination of eating fewer calories and doing moderate exercise. This is the most effective way to improve liver health and potentially reverse fibrosis. Even if you don't lose all the weight, regular exercise alone can reduce liver fat.

Switching patients from DPP-4 inhibitors to GLP-1 receptor agonists improves glycemic control and weight loss, although it may transiently increase gastrointestinal adverse events.

If you are taking a DPP-4 inhibitor (like sitagliptin) and your blood sugar or weight goals aren't being met, switching to a GLP-1 receptor agonist (like exenatide or liraglutide) is a recommended next step. This switch typically leads to better blood sugar control and more weight loss. You may experience some temporary stomach issues, but these often subside.

Higher adherence to the Mediterranean Diet (MD) and higher levels of physical activity are associated with a gut microbiota profile richer in Bacteroidetes (e.g., Flavobacterium, Pedobacter) and lower in Firmicutes, which correlates with lower body fat and higher muscle mass.

Your lifestyle directly shapes your gut bacteria. A diet rich in fibers and polyphenols (Mediterranean style) and regular physical activity are associated with a microbiome that supports leanness and muscle health. Focus on incorporating more plant-based fibers and moving regularly to foster a gut environment that supports metabolic health.

Replacing saturated fat with monounsaturated fat (MUFA) or polyunsaturated fat (PUFA) improves insulin sensitivity and lowers fasting insulin concentrations compared to saturated fat diets.

To improve how your body handles insulin, replace saturated fats (butter, fatty meats) with unsaturated fats (olive oil, nuts). This substitution is likely to improve insulin sensitivity and lower fasting insulin levels compared to a high-saturated-fat diet.

Tennis training must be specific to match the sport's intermittent nature (points of 3-15 seconds with 1:2 to 1:5 work-to-rest ratios) rather than relying on general endurance or continuous aerobic training.

Stop training tennis like you are running a marathon. Design your drills to mimic actual match conditions: short bursts of high intensity (3-15 seconds) followed by specific rest periods (1:3 to 1:5 work-to-rest ratio). Focus on stop-start movements and multidirectional agility rather than continuous jogging.

Fatigue significantly reduces hitting accuracy (up to 81%) and alters biomechanics, making rest periods critical for technical drills.

When practicing shots, ensure you are not fatigued. If you are tired, your accuracy drops by up to 81% and your mechanics break down, increasing injury risk. Use longer rest periods during technical drills to maintain high-quality movement patterns.

Tennis players require specific shoulder flexibility training to prevent injury, as playing alone does not improve external rotation and may lead to imbalances.

Add specific shoulder flexibility training to your routine, focusing on external rotation. Playing tennis alone increases internal rotation but decreases external rotation, creating an imbalance that leads to injury. Perform this training year-round.

Adhering to high-quality dietary patterns, as measured by HEI, AHEI, or DASH scores, is inversely associated with a reduced risk of all-cause mortality, cardiovascular disease, cancer, type 2 diabetes, and neurodegenerative diseases.

Adopt a dietary pattern that emphasizes fruits, vegetables, whole grains, lean proteins, and healthy fats while limiting sodium, added sugars, and saturated fats. This approach, validated by indices like DASH, HEI, or AHEI, is associated with a 14-20% reduction in the risk of major chronic diseases and mortality. Start by swapping refined grains for whole grains and increasing vegetable variety.

Maintaining five specific healthy lifestyle factors (BMI <25, moderate/no alcohol, healthy diet, high physical activity, never smoking) from young adulthood (ages 18-30) through middle age (ages 38-45) is strongly associated with achieving a low cardiovascular disease risk profile in middle age.

To maximize your cardiovascular health in middle age, adopt and maintain five key habits starting as early as possible: keep your BMI under 25, never smoke, drink alcohol moderately or not at all, eat a diet high in fiber/potassium/calcium and low in saturated fat, and engage in regular physical activity. While starting young is ideal, adopting these habits later in life still significantly improves your risk profile compared to not having them.

Accumulating 30–40 minutes of moderate-to-vigorous physical activity (MVPA) per day attenuates the increased risk of all-cause mortality associated with high sedentary time in middle-aged and older adults.

If you sit for long periods, you can significantly lower your mortality risk by getting 30-40 minutes of moderate-to-vigorous activity (like brisk walking or jogging) each day. You do not need to exercise for an hour to see these benefits. This threshold is lower than previously thought based on self-reported data.

Lifestyle interventions (dietary modification, weight loss, and exercise) significantly reduce the incidence of type 2 diabetes in overweight adults with impaired glucose tolerance, effectively mitigating genetic risk.

If you are overweight and have impaired glucose tolerance, committing to lifestyle changes (diet, exercise, weight loss) can cut your risk of developing type 2 diabetes by more than half. This is true even if you have a strong family history of the disease, as lifestyle changes can neutralize genetic risks.

Weight loss interventions improve obesity-related inflammatory markers (ORIM), with the greatest improvements occurring when weight loss exceeds 10%.

To significantly reduce inflammation associated with obesity, aim for a weight loss of at least 10% of your body weight. While smaller losses may have some benefit, the most robust improvements in inflammatory markers like CRP and IL-6 are consistently seen when this 10% threshold is met through diet, exercise, or surgery.

Focusing on whole foods and their natural matrix (food synergy) yields superior health outcomes compared to isolating and supplementing single nutrients, as the food matrix provides synergistic interactions that isolated components lack.

Prioritize eating whole, minimally processed foods (like fruits, vegetables, whole grains, nuts, and seeds) over taking isolated nutrient supplements. The natural combination of nutrients and phytochemicals in these foods works synergistically to promote health, whereas isolated supplements often fail to provide the same benefits and may even be harmful.

Initiating or sustaining moderate-to-vigorous physical activity (at least once per week) in older adulthood (60+) is associated with a significantly higher likelihood of healthy ageing, defined as surviving without major chronic disease, cognitive or physical impairment, or depressive symptoms.

Start or continue moderate-to-vigorous physical activity at least once a week, regardless of your current age. Even if you have been inactive, becoming active in older adulthood is associated with a significantly higher chance of healthy ageing, defined as avoiding major chronic diseases, cognitive or physical decline, and depression.

Reallocating time from sedentary behavior to moderate-to-vigorous physical activity (MVPA) significantly reduces all-cause mortality risk, with the magnitude of benefit increasing as the intensity of the substituted activity increases.

To lower your risk of death, prioritize replacing sitting time with moderate-to-vigorous activity (like brisk walking, jogging, or cycling) over light activity. The more intense the activity you swap in, the greater the mortality benefit. You do not need to find extra time; simply displace sedentary time with this higher-intensity movement.

Reallocating time from sedentary behavior to physical activity (both LPA and MVPA) is associated with reduced adiposity markers, including body mass index (BMI), body fat percentage, and waist circumference, with MVPA showing greater effects than LPA.

To reduce body fat and waist circumference, replace sitting time with physical activity. While moderate-to-vigorous activity (MVPA) offers the greatest benefit, even light physical activity (LPA) substitutions can help reduce BMI and body fat percentage across all age groups.

Engaging in moderate-to-high leisure-time physical activity (LTPA) or objectively measured brisk walking significantly reduces all-cause mortality and increases life expectancy in individuals with multimorbidity (two or more chronic conditions), with benefits comparable to or exceeding those seen in individuals without multimorbidity.

If you have two or more chronic conditions, you do not need to perform extreme exercise to gain significant health benefits. Aim for moderate activity, such as 150 minutes of moderate-intensity exercise per week, or as little as 10 minutes of brisk walking daily. This level of activity is associated with a substantial increase in life expectancy (over 3 years at age 45) and reduced mortality risk, comparable to those without chronic conditions.

Weight loss and lifestyle modifications (diet, exercise, sleep) are the most effective management strategies for PCOS, as they improve insulin sensitivity, reduce hyperandrogenism, and restore reproductive function.

Focus on sustainable lifestyle changes rather than quick fixes. Aim for a modest 5% weight loss if overweight, as this significantly improves PCOS symptoms. Engage in 30-60 minutes of moderate physical activity daily; avoid excessive exercise which may worsen anovulation. Prioritize sleep sufficiency (7-8 hours) as it is a prerequisite for successful weight loss and metabolic health.

Adherence to a Mediterranean Diet (MD) reduces the incidence of type 2 diabetes and improves glycemic control (HbA1c) independent of weight loss.

Adopt a Mediterranean-style diet focusing on fruits, vegetables, legumes, olive oil, and nuts. You do not need to strictly count calories or restrict energy intake to see improvements in blood sugar and diabetes risk.

Combining the Mediterranean Diet with physical activity (specifically moderate-to-heavy exercise or HIIT) augments anti-inflammatory and metabolic benefits compared to either intervention alone.

Do not rely on diet or exercise alone. Combine a Mediterranean-style diet with regular physical activity (such as HIIT or moderate-to-heavy exercise) to maximize anti-inflammatory benefits and metabolic health.

Insufficient sleep duration (less than 7 hours) disrupts hormonal regulation of appetite by decreasing leptin and increasing ghrelin, leading to increased caloric intake, preference for high-calorie foods, and higher risk of obesity.

Prioritize getting 7-9 hours of sleep. If you are sleep-deprived, you are biologically predisposed to eat more and crave high-calorie foods due to hormonal shifts (low leptin, high ghrelin). Fixing sleep is often more effective for weight management than dieting alone.

Progressive strength training induces significant muscle hypertrophy and strength gains in older women despite low basal testosterone levels, driven by neural adaptations and acute growth hormone responses rather than chronic hormonal elevation.

Older women can achieve substantial strength and muscle gains through twice-weekly progressive resistance training, even with naturally low testosterone. Focus on progressive overload (40-80% 1RM) rather than expecting hormonal spikes to drive growth.