Browse the evidence

Standardizing dietary interventions by objective diet quality (e.g., HEI-2020) while allowing variable diet types (cultural/personalized) improves adherence and external validity compared to fixed-type, one-size-fits-all interventions.

Focus on the quality of your diet (vegetables, fruits, legumes, nutrient density) rather than forcing yourself into a specific named diet (like Keto or strict Mediterranean) if it clashes with your culture or preferences. Use tools to measure your diet quality objectively. If you can maintain high quality while eating foods you culturally and personally enjoy, you will adhere better and see better long-term health outcomes.

Long-term compliance and weight maintenance are determined by psychological factors and behavioral strategies rather than macronutrient composition.

To maintain weight loss, focus on building sustainable habits, managing stress, and seeking social support. The specific type of diet (low-carb, low-fat, etc.) is less important for long-term success than your ability to adhere to it psychologically and behaviorally.

Food Is Medicine (FIM) interventions, including produce prescriptions and medically tailored meals, show promise in improving diet quality and food security, but current evidence is insufficient to definitively establish their effectiveness on clinical outcomes or cost savings due to small sample sizes and lack of randomized controlled trials.

To improve health through diet, simply knowing what to eat is often not enough due to structural barriers like cost and access. Food Is Medicine programs attempt to bridge this gap by providing healthy food directly (via vouchers or meals) alongside healthcare. While these programs show promise in improving diet quality, they are not yet proven to significantly reduce clinical events or healthcare costs due to limited high-quality research. Patients should look for programs that integrate food provision with healthcare support, especially if they face food insecurity.

EPA and DHA supplementation inhibits the elevation of inflammatory markers (IL-6, TNF-α) and muscle damage markers (CK, Mb) following eccentric exercise, though results for CK/Mb are inconsistent.

Fish oil may help lower inflammation after hard exercise, but it does not reliably reduce the blood markers of muscle damage (like CK) in all cases. Focus on the functional benefits (less soreness, better strength retention) rather than blood tests.

Whey protein supplementation combined with resistance exercise training increases skeletal muscle mass and handgrip strength in older adults with sarcopenia compared to resistance exercise alone, although the effect sizes are small and may not exceed the minimally important clinical difference.

If you are an older adult with sarcopenia, adding whey protein to your resistance training routine can help you gain a small amount of muscle and grip strength. However, do not expect dramatic changes; the benefits are modest and may not translate to major functional improvements. Consistency with both exercise and protein intake is key.

Intermittent Energy Restriction (IER) involving alternating periods of energy restriction with refeeds may preserve resting energy expenditure (REE) and fat-free mass (FFM) better than Continuous Energy Restriction (CER) during weight loss, though evidence in athletes is currently limited.

If you are an athlete struggling with plateaus or extreme hunger on a standard diet, try adding 'refeed' days where you eat at maintenance or slightly above. This might help preserve your muscle and keep your metabolism from slowing down as much as it would on a constant low-calorie diet. However, be aware that direct proof in athletes is still scarce, so monitor your progress closely.

Strict exercise technique (minimizing involvement of ancillary muscle groups) is recommended over non-strict technique (using momentum or body sway) to ensure the target muscle receives the primary hypertrophic stimulus and adheres to recommended tempo and ROM.

Aim for strict form by minimizing body sway and momentum, especially if the assisting muscles are not being effectively trained (e.g., hip extensors during bicep curls). This ensures the target muscle handles the load and adheres to the recommended 2-8 second tempo and long muscle length ROM. However, if assisting muscles are also at long muscle lengths, some involvement may be acceptable.

A 6-week Low-Carbohydrate High-Fat (LCHF) nutrition education program improves subjective energy levels, satiety, and metabolic health markers in women with pre-existing non-communicable diseases from under-resourced communities.

If you have metabolic issues and live in a low-resource setting, a LCHF approach focusing on affordable whole foods (eggs, chicken, vegetables) can be sustainable and improve energy and satiety. Leverage social support (groups, messaging apps) to maintain adherence, as isolation is a major barrier. Expect some initial resistance from family or doctors, but visible health improvements often convert them to supporters.

Combining GLP-1/GIP receptor agonists (semaglutide/tirzepatide) with structured resistance training (3-5 days/week) and high protein intake (1.6-2.3 g/kg fat-free mass/day) can preserve or increase lean soft tissue (LST) during significant weight loss, contrary to typical clinical trial outcomes.

If you are taking semaglutide or tirzepatide, do not rely on the medication alone to protect your muscles. You must lift weights 3-5 times a week and eat enough protein (aim for 1.6-2.3 grams per kilogram of your lean body mass). Without this, you risk losing significant muscle along with fat.

Combination anti-obesity medication regimens including GLP-1 receptor agonists can achieve total body weight loss (approx. 32.5%) comparable to metabolic/bariatric surgery in patients with severe obesity.

If you have severe obesity and have not lost significant weight with standard medications or lifestyle changes alone, ask your doctor about combination therapy. Adding a GLP-1 agonist (like semaglutide) to other approved weight-loss drugs may produce results similar to bariatric surgery. This approach targets multiple biological pathways (hunger, satiety, metabolism) simultaneously, which may be necessary for severe cases.

Longer-muscle length resistance training (LML-RT) may lead to greater increases in fascicle length (longitudinal hypertrophy) compared to shorter-muscle length resistance training (SML-RT), though evidence is mixed and methodologically limited.

Training at longer muscle lengths may help increase the length of your muscle fibers (fascicles), which can contribute to overall muscle size. However, current measurement methods are imperfect, so prioritize long-length training for overall hypertrophy rather than expecting specific longitudinal gains to be easily quantified.

The Adaptive Ketogenic–Mediterranean Protocol (AKMP) utilizes dynamic, biomarker-guided adjustments to metabolic adaptation (adaptive thermogenesis) to sustain weight loss, whereas GLP-1 agonists fail to counteract the resulting decline in energy expenditure.

If you are using a ketogenic or low-carb approach and hit a weight loss plateau, do not just restrict calories further. Monitor your metabolic markers (like ketones and blood sugar). If you stall, the protocol suggests dynamically adjusting your macronutrients—specifically increasing protein and adjusting fats—to leverage the metabolic advantage of ketosis and counteract the natural drop in energy expenditure that occurs during weight loss.

Supplementation with β-hydroxy β-methylbutyrate (HMB) may preserve fat-free mass and increase muscle strength in individuals undergoing weight reduction, although robust evidence in obesity patients is lacking.

HMB might help preserve muscle during weight loss, especially in older adults or those losing weight quickly. However, evidence is limited for obesity patients. Prioritize protein and exercise first; consider HMB as a potential add-on if affordable and after consulting a healthcare provider.

A personalized, human-centered, telephone-linked dietary decision support system improves nutrition knowledge, attitudes, practices, and patient satisfaction compared to standard paper-based diet records in patients with type 2 diabetes.

If you have diabetes, using a digital tool that sends you personalized feedback and reminders about your daily food intake can help you learn more about nutrition and feel more satisfied with your care compared to just writing down what you eat on paper. This system works by making it easy to log food and get advice, even if you only have a basic phone.

The effect of lifestyle intervention on cognitive impairment varies by baseline BMI, with potential benefit for overweight individuals (BMI 25-29) and potential harm for obese individuals (BMI ≥40).

For overweight individuals (BMI 25-29) with type 2 diabetes, lifestyle intervention may offer some cognitive protection. However, for those with severe obesity (BMI ≥40), the same intervention might be associated with a higher risk of cognitive impairment compared to controls. This suggests that the cognitive impact of weight loss may depend on starting weight, with potential benefits for the overweight and potential risks for the severely obese, possibly due to the loss of neuroprotective factors associated with higher body fat.

Integrating health coaching into primary care for obesity treatment, utilizing motivational interviewing and goal-setting, leads to significant sustained weight loss and improved metabolic markers compared to standard care.

If you are struggling with obesity, standard advice to 'eat less and move more' may not be enough. Consider working with a health coach who uses motivational techniques to help you set and achieve small, manageable goals. This approach focuses on building habits and self-efficacy rather than just providing information, which can lead to sustained weight loss and improved health markers.

Visual dietary decision aids that incorporate specific nutritional data (sodium, calories) and budget constraints facilitate immediate, positive behavioral dialogue and choice selection in patients with severe mental illness.

For patients with severe mental illness, standard verbal advice often fails due to cognitive or financial barriers. Use laminated, visual cards that show specific food choices, sodium/calorie counts, and budget-friendly alternatives. Discuss these cards during home visits to open conversations about healthier, affordable options.

Among popular named diets, the Mediterranean diet is the only one that maintains significant LDL cholesterol reduction benefits at 12 months, whereas other cardiovascular risk factor improvements disappear.

If your goal is long-term LDL cholesterol management, the Mediterranean diet is the only popular named diet in this review that maintains its benefit at 12 months. Other diets may lower LDL initially, but the effect tends to fade. Consider adopting Mediterranean principles if lipid control is a primary long-term concern.

Alternate-day fasting (ADF) may lead to more favorable body composition changes (fat loss vs. lean mass gain) during weight regain compared to daily caloric restriction, potentially due to preserved resting metabolic rate.

If you are concerned about losing muscle while dieting, ADF might be a better option than daily restriction. This study suggests that after weight loss, ADF participants regained less fat and more muscle than those on daily restriction, possibly due to better preservation of metabolic rate.

Replacing carbohydrate with protein in a low-fat diet (up to 25% energy) improves weight loss outcomes compared to high-carbohydrate low-fat diets.

If you are following a low-fat diet, increasing protein to 25% of your energy intake (replacing some carbs) can help you lose more weight. This was shown to be safe for kidney and bone health in obese patients over 6 months.

Sugar-sweetened beverages promote weight gain more effectively than solid sugar or artificial sweeteners due to poor compensation of liquid calories.

Avoid sugar-sweetened beverages. They promote weight gain because your body does not compensate for liquid calories as it does for solid food. Choose water or artificial sweeteners if you need a sweet drink.

Post-bariatric exercise training significantly improves physical function, measured by the 6-minute walk test (6MWD), adding approximately 29.67 meters compared to surgery alone.

If you have had bariatric surgery, adding exercise to your routine will help you improve your physical function and mobility compared to relying on surgery and diet alone. For the best results, wait at least one year after surgery to start a structured exercise program, and combine aerobic activities (like walking or cycling) with resistance training (weight lifting). Aim for 1.3 to 4 hours of exercise per week, spread over 2-3 sessions.

Time-restricted eating (TRE), lower meal frequency, and earlier caloric distribution result in statistically significant but small weight loss compared to control groups when implemented for 12 weeks or longer.

If you want to try meal timing for weight loss, expect a modest result (around 1-2 kg loss over 12+ weeks) rather than a dramatic transformation. The key is likely that restricting your eating window naturally reduces the amount of food you consume, not a magical metabolic shift. Focus on consistency for at least 12 weeks, and do not expect it to replace the fundamental need for a caloric deficit.

Catechin-rich green tea combined with inulin is an effective weight loss intervention, ranking highest in its network.

Catechin-rich green tea (650mg) combined with inulin may support weight loss, though the evidence is less robust than other interventions. It ranked highest in its network, but the confidence interval includes zero, so the effect is uncertain.