Browse the evidence

During mild-to-moderate intensity exercise (40% VO2max), women oxidize a significantly higher proportion of fat and a lower proportion of carbohydrate compared to men, a difference driven by greater lipolytic sensitivity to catecholamines despite lower absolute catecholamine levels in women.

If you are a woman exercising at a moderate intensity (where you can hold a conversation), your body is likely prioritizing fat burning more efficiently than a man doing the same relative effort. This is due to hormonal differences, specifically how your body responds to stress hormones like epinephrine. This doesn't mean you should avoid carbs, but it does mean your fuel utilization strategy during endurance activities differs from men's.

Dual GIP/GLP-1 receptor agonism (e.g., tirzepatide) yields superior glycemic control and body weight reduction compared to selective GLP-1 receptor agonists.

For patients with type 2 diabetes seeking maximum glucose and weight reduction, dual GIP/GLP-1 agonists (like tirzepatide) are clinically superior to selective GLP-1 agonists. This represents a shift from previous assumptions that GIP was therapeutically useless in diabetes.

A low-glycemic load diet produces significantly greater weight loss and body fat reduction than a low-fat diet in obese young adults with high insulin secretion (high 30-min post-glucose insulin), whereas both diets yield comparable results in those with low insulin secretion.

If you are obese and struggling with weight loss, your insulin response to carbohydrates might be the key. If you have high insulin levels after eating carbs, switching to a low-glycemic load diet (focusing on nonstarchy vegetables, legumes, and healthy fats) is likely to be more effective for weight loss than a standard low-fat diet. If your insulin response is normal, a low-fat diet will work just as well. Consider getting your insulin response tested to guide your dietary choice.

Higher circulating levels of trans-palmitoleic acid (trans-16:1n-7), an exogenous fatty acid derived primarily from dairy fat, are associated with a significantly lower incidence of type 2 diabetes and improved metabolic risk factors, including lower insulin resistance and triglycerides.

Higher levels of trans-palmitoleic acid, a fatty acid found in dairy products, are linked to a lower risk of developing type 2 diabetes and better metabolic health. While this is an observational finding, it suggests that including whole-fat dairy as part of a balanced diet may be associated with these benefits, distinct from industrial trans fats.

A higher triglyceride-glucose (TyG) index, serving as a surrogate marker for insulin resistance, is significantly associated with increased risks of composite cardiovascular events, cardiovascular mortality, myocardial infarction, stroke, and incident type 2 diabetes.

Your risk for heart disease and diabetes is closely linked to your insulin resistance, which can be estimated using a simple calculation from your fasting triglyceride and glucose levels. This risk is not uniform; it is significantly higher for people living in low- and middle-income countries. Regular monitoring of these markers can help identify those at high risk for cardiovascular events and diabetes, allowing for earlier intervention.

Supplementing a suboptimal dose of whey protein (6.25 g) with either leucine or essential amino acids (EAAs) stimulates myofibrillar protein synthesis (MPS) at rest to the same extent as a full dose (25 g) of whey protein, but only the full dose sustains elevated MPS rates following resistance exercise.

If you are eating a small amount of protein (e.g., 6-7g) after a workout, adding leucine or essential amino acids will boost your muscle protein synthesis to the same level as eating a full serving (25g) of protein, but only for the first few hours. To keep muscle building active for the full 5+ hours post-workout, you need the full dose of protein, not just the leucine boost.

Early time-restricted feeding (eTRF) reduces appetite and increases fat oxidation but does not significantly alter 24-hour energy expenditure in humans.

If you try eating all your meals between 8 am and 2 pm, you likely won't burn significantly more calories than usual. However, you will likely feel less hungry and more full throughout the day because your hunger hormones (ghrelin) are better regulated. This makes it easier to eat less without feeling deprived, which is the actual mechanism for weight loss.

Consumption of flavonoid-rich foods (cocoa, tea, berries) produces small but measurable improvements in blood pressure, endothelial function, and insulin resistance, mediated by enhanced nitric oxide bioavailability and AMPK activation.

Incorporate flavonoid-rich foods like dark chocolate (cocoa), tea, and berries into your daily diet. You do not need large quantities; even small amounts (e.g., ~30 kcal/d of dark chocolate) can contribute to lower blood pressure and better vascular health. Focus on consistency rather than high doses of supplements.

A low-glycemic load diet produces greater weight loss and body fat reduction than a low-fat diet specifically in obese young adults with high insulin secretion (high 30-minute post-glucose insulin levels).

If you are obese and struggling with weight loss, your body's insulin response to carbohydrates might dictate which diet works for you. If you have high insulin levels after eating carbs, a low-glycemic load diet (focusing on nonstarchy vegetables, legumes, and temperate fruits) is likely more effective for weight loss than a standard low-fat diet. If your insulin response is normal, both diets may yield similar results. Consider getting your insulin response tested to guide your dietary choice.

Higher circulating levels of long-chain omega-3 fatty acids (EPA, DPA, DHA) are associated with lower total mortality and specifically reduced cardiovascular mortality in older adults without prevalent cardiovascular disease.

For older adults (65+) without existing heart disease, maintaining higher blood levels of EPA, DHA, and DHA is linked to living longer, primarily by reducing heart-related deaths. This suggests that ensuring adequate intake of these fatty acids through diet (e.g., fish) is a viable strategy for longevity, with an estimated gain of over 2 years of life after age 65 for those with the highest levels compared to the lowest.

The age-related decline in plasma IGF-I can be mitigated by high intakes of protein and minerals, resulting in IGF-I levels in older men comparable to those in younger men with lower intakes.

As you age, maintaining high protein and mineral intake is crucial for preserving IGF-I levels. This may help counteract the natural age-related decline in growth hormone and IGF-I, potentially supporting muscle mass and metabolic health.

Post-diagnosis obesity (BMI >= 30 kg/m2) is associated with a 52% increase in all-cause mortality and a 2.28 times greater risk of breast cancer-specific mortality compared to normal BMI.

Maintaining a normal BMI after a breast cancer diagnosis is strongly associated with better survival. Obese women (BMI >= 30) had more than double the risk of dying from breast cancer compared to those with a normal BMI. Survivors should aim to achieve and maintain a healthy weight through diet and exercise, as this is linked to significantly improved mortality outcomes.

Long-term leisure-time physical activity (specifically vigorous activity) significantly improves cardiovascular risk biomarkers by increasing HDL cholesterol and decreasing leptin and C-peptide levels, independent of body mass index.

To improve your cholesterol and metabolic markers, focus on consistent leisure-time physical activity over the long term. While vigorous exercise (like running or tennis) offers the strongest boost to HDL cholesterol, any regular activity that accumulates metabolic equivalents (METs) helps lower leptin and insulin levels. You do not need to lose weight to see these specific biomarker improvements; the activity itself drives the benefit.

Metformin therapy reduces the risk of type 2 diabetes in prediabetic adults by 45%, with greater benefits in those with higher baseline BMI.

If lifestyle changes alone are not enough to prevent diabetes, especially if you have a higher BMI, your doctor may prescribe metformin. It is a safe and effective medication that can help reduce your risk of developing type 2 diabetes.

Testosterone administration stimulates net muscle protein synthesis without increasing inward amino acid transport, primarily by enhancing the reutilization of intracellular amino acids derived from protein breakdown.

Testosterone boosts muscle growth by making your body better at recycling amino acids from broken-down muscle protein back into new muscle, rather than by pulling more amino acids from your blood. This means that even without increased nutrient transport, your muscles can build more protein if testosterone levels are elevated.

Massive weight loss induces a metabolic adaptation (adaptive thermogenesis) that reduces resting metabolic rate (RMR) significantly more than can be explained by the loss of fat-free mass (FFM) and fat mass alone, even when FFM is preserved through vigorous exercise.

If you lose a lot of weight, your body will fight back by lowering your resting calorie burn, even if you keep your muscle. This is a normal survival mechanism, not a failure. To maintain your new weight, you likely need to sustain higher levels of physical activity or adjust your calorie intake, rather than expecting your metabolism to return to its pre-weight-loss state.

Higher erythrocyte trans fatty acid content is significantly associated with an elevated risk of coronary heart disease (CHD), with individuals in the highest quartile having a relative risk of 3.3 compared to the lowest quartile after adjusting for cardiovascular risk factors and other fatty acids.

High levels of trans fats in your blood cells are a strong predictor of heart disease risk. This risk persists even after accounting for other lifestyle factors like smoking, weight, and exercise. To mitigate this risk, minimize intake of partially hydrogenated oils found in many processed foods, as these directly elevate your trans fat biomarkers and negatively impact your cholesterol profile.

Skeletal muscle oxidative capacity (enzyme activity) is a stronger predictor of whole-body insulin sensitivity than intramuscular lipid status (triglyceride or long-chain fatty acyl CoA content).

Focus on building your muscles' ability to burn energy (aerobic fitness and mitochondrial density) rather than just avoiding intramuscular fat. High-intensity endurance training significantly improves oxidative capacity, which is strongly linked to better insulin sensitivity, regardless of how much fat is stored in the muscle.

Ingestion of 100g carbohydrates post-resistance exercise improves net muscle protein balance primarily by reducing protein breakdown, but this effect is minor, delayed, and fails to achieve positive net synthesis compared to amino acid ingestion.

Eating 100g of carbohydrates after resistance training helps your muscles retain protein by slowing down breakdown, largely through an insulin response. However, this effect is small and slow compared to eating protein. Do not rely on carbs alone for muscle growth; they are a supportive tool, not a primary driver of synthesis.

GLP-1 receptor agonists exhibit significant inter-individual variability in weight loss, with early responders (>=4% loss at week 16) predicting superior long-term outcomes.

If you start a GLP-1 agonist (like Ozempic or Wegovy) and don't lose at least 4% of your body weight by week 16, you are statistically likely to be a 'non-responder' with only ~3% total loss. However, early weight loss is a strong predictor of success. If you are not losing weight early, discuss with your doctor whether to continue for metabolic benefits or switch therapies, as stopping rules are often built into prescriptions.

Reversible intermittent intra-abdominal vagal nerve blockade produces statistically greater weight loss than a sham device in patients with morbid obesity, though it failed to meet pre-specified superiority margins for excess weight loss.

This therapy involves implanting a device that blocks stomach signals to reduce hunger. In this study, patients using the device lost significantly more weight than those with a sham device, though not enough to meet the study's strict success criteria. The device requires daily recharging and periodic programming adjustments. It is an option for those with severe obesity who want a less invasive alternative to surgery but are willing to manage a medical device.

Moderate sodium intake (3–5 g/d) is associated with the lowest risk of cardiovascular events and mortality, whereas both lower (<3 g/d) and higher (>5 g/d) intakes are associated with increased risk, forming a J-shaped curve.

Aim for a moderate sodium intake of 3–5 grams per day (approx. 0.75–1.25 teaspoons of salt). Avoid both excessive salt (>5 g/d) and very low salt diets (<3 g/d), as both are associated with higher cardiovascular risk in large population studies. This is particularly important if you have hypertension, where high sodium poses a greater risk.

Low circulating plasma adropin levels are significantly associated with obesity, aging, and metabolic syndrome risk factors in humans, while gastric bypass surgery leads to a transient increase in adropin levels.

If you are obese or aging, your body's natural production of the hormone adropin tends to be lower. This low level is linked to higher risks for metabolic issues like high triglycerides and insulin resistance. Bariatric surgery can temporarily boost these levels, suggesting that restoring adropin might be part of why weight loss surgery improves metabolic health. Monitoring metabolic health should consider hormonal factors beyond just weight.

Low plasma adropin levels are independently associated with higher fasting triglycerides (TG) and other metabolic syndrome risk factors, regardless of BMI and age.

Low levels of the hormone adropin are specifically linked to high triglyceride levels, even when you account for your weight and age. This suggests that adropin plays a direct role in how your body handles fats, independent of just being overweight.