Browse the evidence

Once-daily oral semaglutide 50 mg significantly reduces ad libitum energy intake, body weight, and appetite while improving control of eating in adults with obesity, without delaying gastric emptying at steady state.

Take oral semaglutide 50 mg once daily, following the specific dose-escalation schedule (starting at 1.5 mg and increasing every 4 weeks). Do not eat or drink (except water) for 6 hours before taking the tablet, and wait 30-45 minutes after taking it before your first meal. This regimen significantly reduces your energy intake and body weight primarily by lowering appetite and improving control over eating, rather than by slowing down your digestion.

A multi-component intervention (SAMMAS) combining low-carbohydrate nutrition (≤30% carbs), meal replacement, continuous glucose monitoring, and telemedical coaching significantly reduces body weight and fasting insulin in overweight/obese adults compared to a control group, with effects sustained at 52 weeks.

To lose weight and improve metabolic health, consider a structured program that combines a low-carbohydrate diet (limiting carbs to 30% or less of calories), potentially using meal replacement formulas for some meals, and leveraging technology like glucose monitors and coaching for accountability. This approach targets insulin levels to facilitate fat loss, rather than relying solely on calorie counting.

Tirzepatide (5, 10, and 15 mg once weekly) produces significantly greater weight loss than both placebo and GLP-1 receptor agonists (semaglutide, dulaglutide) in adults with overweight or obesity.

If you have overweight or obesity, tirzepatide (administered once weekly) is a highly effective pharmacological option for weight loss, outperforming both placebo and existing GLP-1 medications like semaglutide. Expect significant weight reduction (up to ~12.5 kg with the highest dose) and a higher likelihood of achieving major weight loss milestones (5%, 10%, 15%). Be prepared for potential gastrointestinal side effects (nausea, diarrhea), which are common but often manageable and comparable to other drugs in this class. Consult a healthcare provider to determine if you are a candidate based on your BMI and health status.

Once-weekly tirzepatide (5, 10, or 15 mg) combined with lifestyle intervention produces statistically significant and clinically meaningful body weight reductions (up to -22.4%) and improvements in cardiometabolic risk factors in Japanese adults with obesity or overweight.

For Japanese adults with obesity or overweight, adding once-weekly tirzepatide to a standard lifestyle program (calorie deficit and exercise) leads to substantial weight loss (up to ~22%) and improves heart health markers like blood pressure and cholesterol. While injections are required, side effects like nausea are common but usually mild and temporary. This treatment is specifically approved and effective for this demographic, who may face higher health risks at lower BMIs compared to other ethnicities.

A 12-week low-glycemic index (LGI) diet produces significantly greater reductions in waist circumference, LDL cholesterol, non-HDL cholesterol, and leptin, along with greater increases in GLP-1, compared to a matched low-energy diet (LED) in women with excess body weight, without causing a decline in resting metabolic rate.

To improve your metabolic health and reduce belly fat, switch to a low-glycemic index diet for 12 weeks. Focus on eating foods with a GI of 55 or less freely, limit moderate-GI foods to two servings a day, and avoid high-GI foods. You do not need to strictly count calories; eat until you are satisfied. This approach has been shown to lower bad cholesterol, reduce belly fat more effectively than standard dieting, and improve hormonal markers like GLP-1 without slowing down your metabolism.

Ingestion of whey protein hydrolysate stimulates mixed muscle protein synthesis (MPS) to a significantly greater degree than micellar casein or soy protein isolate in young men, both at rest and following resistance exercise.

If you are looking to maximize muscle growth after resistance training, choose whey protein hydrolysate over casein or soy. The study shows whey stimulates muscle protein synthesis significantly more (up to 122% more than casein) because it digests faster and provides a quicker spike in leucine, which triggers muscle building. Ensure you consume about 20-25g of whey protein (providing ~10g of essential amino acids) immediately after your workout.

Ingestion of 40g of essential amino acids (EAA) or mixed amino acids (MAA) immediately after resistance exercise shifts net muscle protein balance from negative (degradation) to positive (synthesis).

After your resistance training session, consume 40 grams of essential amino acids (or mixed amino acids). This will shift your muscles from breaking down protein to building it. You do not need to include non-essential amino acids in your supplement; essential amino acids alone are sufficient to maximize this post-workout anabolic response.

Post-diagnosis engagement in moderate-intensity recreational physical activity (≥2.8 MET-h/wk) significantly reduces the risk of breast cancer-specific mortality and all-cause mortality in women with invasive breast cancer.

After a breast cancer diagnosis, engaging in moderate-intensity recreational physical activity (like brisk walking) for at least 2.8 MET-hours per week is associated with a significantly lower risk of dying from breast cancer. You do not need to perform vigorous exercise to gain these survival benefits; consistent, moderate movement is effective.

GLP-1 receptor agonists (liraglutide, semaglutide) and dual GIP/GLP-1 agonists (tirzepatide) produce significant weight loss in adults with obesity by acting centrally to reduce appetite and peripherally to delay gastric emptying.

Semaglutide 2.4mg weekly, combined with a 500 kcal daily deficit and 150 minutes of weekly activity, produces an average 14.8% body weight loss over 68 weeks. Expect gastrointestinal side effects like nausea, which are common but often manageable.

Engaging in vigorous physical activity (e.g., running, jogging) reduces the relative risk of ovulatory disorder infertility, with each additional hour per week of vigorous activity associated with a 7% reduction in risk.

If you are trying to conceive, do not stop exercising. Aim for about an hour a week of vigorous activity, such as running, jogging, or racquet sports. This level of activity is associated with a lower risk of ovulatory infertility. You do not need to do moderate exercise like brisk walking to see this benefit, but vigorous activity helps.

Two weeks of progressive resistance exercise significantly increases the fractional rate of quadriceps muscle protein synthesis in both young and elderly adults, effectively eliminating the age-related deficit in synthesis rate without increasing whole-body or myofibrillar protein breakdown.

Start resistance training immediately, regardless of age. Your muscles are just as capable of building protein as a young person's when you lift weights at a challenging intensity (60-90% of your max). You don't need supplements to trigger this early response; the mechanical load itself is the signal.

A low-glycemic load diet improves cardiovascular risk factors (HDL cholesterol and triglycerides) more effectively than a low-fat diet in the general obese population, regardless of insulin secretion status.

To improve your heart health markers like HDL cholesterol and triglycerides, focus on reducing the glycemic load of your diet (eating more nonstarchy vegetables, legumes, and whole fruits) rather than just cutting fat. You can include healthy fats like nuts and oils, which this approach allows, and see better improvements in these specific risk factors compared to a strict low-fat diet.

Whey protein stimulates muscle protein synthesis (MPS) to a greater extent than casein or soy due to its rapid digestibility and high leucine content, leading to superior gains in lean body mass and strength when combined with resistance training.

If you lift weights, choose whey protein for your post-workout shake. It digests fast and spikes leucine, which triggers muscle growth better than slower proteins like casein. Aim for about 25 grams of whey post-workout. If you are older, you might need 35-40 grams to get the same benefit because your body becomes less sensitive to protein as you age.

Older adults require higher doses of whey protein (35-40g) per meal to maximally stimulate muscle protein synthesis due to 'anabolic resistance' associated with aging.

If you are over 65, your body needs more protein to build muscle. Instead of one small shake, split your whey protein into 25-30 gram doses at breakfast and lunch. This helps overcome the natural slowdown in muscle building that happens with age.

Resistance exercise combined with protein ingestion sustains myofibrillar protein synthesis for up to 5 hours, whereas protein ingestion alone at rest produces only a transient (peaking at 3 hours) stimulation of both myofibrillar and sarcoplasmic protein synthesis.

To maximize muscle growth, combine resistance exercise with protein intake. Exercise extends the duration of muscle protein synthesis specifically for contractile (myofibrillar) proteins for up to 5 hours, whereas eating protein alone only stimulates synthesis transiently (peaking at 3 hours) for both contractile and cellular proteins. Focus on getting adequate protein (e.g., 25g) after your workout to leverage this sustained synthetic window.

Creatine supplementation combined with resistance training amplifies the increase in satellite cell and myonuclei numbers in human skeletal muscle, leading to enhanced muscle fiber hypertrophy compared to training alone or with protein supplementation.

If you are strength training, adding creatine monohydrate (5g daily after a short loading phase) helps your muscles build more structural nuclei (myonuclei) compared to training alone. This structural change supports greater long-term muscle growth. You do not need to take massive doses; 5g/day is sufficient when combined with resistance training.

Performing three sets of resistance exercise produces a superior and sustained increase in myofibrillar protein synthesis (MPS) compared to one set, maintaining elevated MPS for at least 24 hours post-exercise.

If you want to maximize muscle growth potential from a single workout, perform three sets of exercises rather than just one. While one set will trigger some immediate protein synthesis, it fades within a day. Three sets sustain the anabolic signal for at least 24 hours, giving your muscles a longer window to repair and grow, especially when combined with protein intake.

A low-glycemic load diet improves cardiovascular risk factors (HDL cholesterol and triglycerides) more than a low-fat diet, regardless of insulin secretion levels.

For heart health, focusing on the quality of carbohydrates (low-glycemic load) may be more beneficial for your triglycerides and HDL cholesterol than simply reducing total fat. A diet rich in nonstarchy vegetables, legumes, and healthy fats (nuts, seeds, oils) supports better lipid profiles than a standard low-fat diet, even if weight loss results are similar.

Post-diagnosis weight gain of >10 kg is associated with a 70% increase in all-cause mortality and a 78% increase in breast cancer-specific mortality compared to maintaining stable weight.

For breast cancer survivors, avoiding significant weight gain after diagnosis is critical for survival. The study shows that gaining more than 10kg after diagnosis significantly increases the risk of dying from breast cancer or other causes. Survivors should work with their care team to monitor weight and implement lifestyle changes to maintain a stable, healthy weight, as this is associated with improved mortality outcomes.

Preserving or recovering beta-cell functional mass is the critical therapeutic strategy for preventing and managing type 2 diabetes, primarily achieved by reducing beta-cell workload through lifestyle modification and weight loss.

Focus on reducing the demand on your pancreas. Since human beta-cells have limited ability to regenerate, the best way to keep them working is to lower the workload. This means prioritizing lifestyle changes and weight loss to improve insulin sensitivity, thereby reducing the strain on your beta-cells and preserving their function.

Whey protein supports greater muscle hypertrophy and net muscle protein balance compared to soy protein when consumed in close temporal proximity to resistance exercise.

If your goal is maximizing muscle growth from resistance training, choose whey protein over soy protein. Consume about 20-25g of whey within 1-2 hours after your workout. While soy supports muscle growth, whey's faster digestion and higher leucine content lead to greater muscle mass gains.

Sustained caloric restriction (800 kcal/day) followed by weight maintenance significantly reduces low-grade inflammation and improves lipid metabolism biomarkers in overweight/obese individuals.

For overweight individuals, a short period of strict caloric restriction (around 800 kcal/day) can significantly reduce chronic inflammation and improve lipid profiles. Crucially, maintaining the weight loss keeps these biological benefits active, suggesting that the initial 'shock' to the system has long-term metabolic advantages if the weight is kept off.

Ingesting carbohydrate during prolonged exercise (≥120 min) improves subsequent time-trial performance, whereas ingesting carbohydrate only before exercise does not.

If you are exercising for more than two hours, do not rely on eating 30 minutes before you start. Instead, consume carbohydrates (approx. 2g per kg of body weight) continuously during the exercise. Eating only before the workout may actually hinder your performance due to blood sugar fluctuations, whereas eating during the workout improves your ability to finish strong.

Weight loss of 5% or more in breast cancer survivors leads to significant decreases in inflammatory and metabolic biomarkers (CRP, insulin, leptin, IL-6), whereas less than 5% weight loss does not significantly alter these biomarkers.

To see improvements in inflammation and hormone levels linked to breast cancer risk, aim for a weight loss of at least 5% of your body weight. Losing less than 5% may not significantly change these specific biomarkers, even if you lose some weight.