Browse the evidence

Averaging the middle three resting metabolic rate (RMR) measurements obtained via indirect calorimetry provides a significantly more reliable estimate of energy needs than a single measurement or averaging the initial/final measurements.

If you are measuring Resting Metabolic Rate (RMR) using indirect calorimetry, do not rely on a single reading. To get an accurate number for calculating your daily energy needs, perform serial measurements (e.g., hourly). Discard the first reading, as the body is still adapting to the equipment. Average the middle few readings (e.g., the 2nd, 3rd, and 4th) to get the most reliable estimate of your true metabolic rate.

Transitioning from a traditional lifestyle to a modernized environment (characterized by reduced physical labor and increased access to processed foods) causes significant increases in obesity and type 2 diabetes prevalence, regardless of genetic predisposition.

Your environment dictates your health more than your genes. If you move from a high-activity, whole-food lifestyle to a sedentary, processed-food lifestyle, your risk of obesity and diabetes will skyrocket, regardless of your ancestry. To prevent this, prioritize physical activity and whole foods, especially if your environment is becoming more sedentary.

Increasing energy expenditure through physical exercise programs leads to only a modest reduction in body fat content (1-2%) in healthy adults, requiring substantial time commitment (e.g., 1.5 hours of cycling daily) to achieve significant changes.

Do not rely on exercise alone to lose significant body fat. The studies show that exercising 125-155 minutes per week for 12 weeks results in only a 1-2% drop in body fat. To achieve meaningful fat loss, you likely need to combine exercise with dietary changes, as the energy expenditure from exercise alone is modest relative to the effort required.

Saturated fatty acids (SFA) promote greater long-term weight gain compared to unsaturated fatty acids (MUFA/PUFA) primarily due to lower diet-induced thermogenesis (DIT) and reduced energy expenditure, despite potentially stimulating appetite-regulating hormones like CCK and PYY more strongly.

Focus on the quality of fat rather than just eliminating it. Replacing saturated fats (found in butter, fatty meats) with unsaturated fats (olive oil, nuts, fish) may support weight control by boosting your body's energy expenditure, even if total calories remain similar.

Monounsaturated fatty acids (MUFA) and Polyunsaturated fatty acids (PUFA) stimulate higher diet-induced thermogenesis (DIT) and energy expenditure compared to Saturated fatty acids (SFA), which may aid in long-term weight maintenance despite having weaker effects on acute appetite suppression.

Incorporate more unsaturated fats (like olive oil, avocados, nuts) into your diet. Even if they don't make you feel as full as other foods, they may help your body burn more calories at rest and after meals compared to saturated fats.

Obese individuals lose more total weight than leaner individuals for the same caloric deficit, but it takes significantly longer to reach the weight loss plateau due to a higher proportion of fat mass loss and slower metabolic adaptation.

If you are heavier, you will likely lose more total weight from the same dietary changes than a lighter person, but it will take much longer. Do not compare your speed of loss to someone who is already lean. Your body has more energy stores to draw from, but the process is slower.

Weight cycling (yo-yo dieting) is associated with increased cardiovascular risk and morbidity, whereas sustained weight loss or maintenance reduces risk.

Avoid yo-yo dieting. Repeatedly losing and regaining weight increases your risk of heart disease. Focus on sustainable weight loss or maintenance. If you struggle with weight cycling, seek professional help to establish stable habits.

In obese men, upper body obesity (higher waist-to-thigh ratio) is associated with a significantly higher basal metabolic rate (BMR) compared to lower body obesity, independent of fat-free mass, fat mass, and age.

For obese men, carrying more weight around the waist (visceral fat) is linked to a higher resting metabolic rate than carrying weight on the hips/thighs. This metabolic difference does not appear to exist in obese women in this study. Focus on overall health markers rather than just total weight.

Greater degrees of weight reduction achieved with tirzepatide are associated with greater improvements in health-related quality of life (HRQoL), particularly when weight loss is ≥5%.

With tirzepatide, you don't need to lose a massive amount of weight to see benefits. Losing 5% or more of your body weight is associated with noticeable improvements in how you feel and function, with greater losses leading to even better outcomes.

Post-resistance exercise protein ingestion in a state of short-term energy deficit selectively promotes autophagic signaling (specifically cAtg12 and FOXO1) compared to placebo, potentially facilitating muscle remodeling despite reduced baseline autophagy markers.

If you are cutting calories and lifting weights, consume 30g of whey protein immediately after your workout. This specific timing and dose helps regulate autophagy (a cellular recycling process) in a way that placebo does not, potentially supporting muscle remodeling even when you are in a caloric deficit.

Lifestyle modification resulting in 7% weight loss and 150-175 minutes per week of physical activity can reduce the relative risk of obesity-related cancer by 16%, suggesting the effects of obesity on cancer risk may be reversible.

Aim for a 7% weight loss and 175 minutes of physical activity per week. While the cancer risk reduction in the major trial was not statistically significant, the trend suggests that maintaining a healthy weight through diet and exercise is a powerful way to lower your cancer risk.

Sustained lockdown-induced sedentary behavior and dietary shifts in healthy adults cause significant worsening of cardiovascular risk factors, including increased BMI, body fat, LDL cholesterol, blood glucose, and blood pressure.

Maintain physical activity and monitor dietary intake during periods of restricted movement. The study shows that even healthy adults experience measurable declines in metabolic health (weight, lipids, glucose) when sedentary, highlighting the need for proactive lifestyle management during lockdowns or similar restrictions.

Using a preceding 24-hour calorimeter stay (Prestudy Day) to estimate energy expenditure is the most accurate method for achieving 24-hour energy balance in subsequent assessments, significantly outperforming regression equations based on anthropometrics, body composition, or resting/sleeping metabolic rates.

If you are conducting precise metabolic research requiring strict energy balance, using a subject's own 24-hour energy expenditure from a prior stay in a calorimeter is the gold standard for predicting their needs. While less accurate methods like Harris-Benedict or RMR-based equations exist, they introduce significant error. Use these simpler methods only if resources for a prestudy calorimeter stay are unavailable, understanding that prediction accuracy will be lower.

Bariatric surgery is indicated for adults with Type 2 Diabetes and BMI ≥35 kg/m² who cannot control their condition with lifestyle and pharmacological treatment, leading to remission in 40-95% of cases.

If you have Type 2 Diabetes and a BMI of 35 or higher, and lifestyle changes and medications aren't working well, discuss bariatric surgery with your doctor. It can put diabetes into remission for many people, but requires lifelong medical monitoring.

Very low-calorie diets (VLCD) are suitable for short-term use in specific clinical populations, such as those with Type 2 Diabetes (T2D), to improve glycemic control and cardiovascular risk factors, but are not recommended for long-term use or for older adults at risk of sarcopenia.

If you have Type 2 Diabetes, a very low-calorie diet might help your blood sugar and weight quickly, but only under doctor supervision and for a short time. Do not use this if you are older and worried about muscle loss.

Bioelectrical Impedance Spectroscopy (BIS) is recommended as a feasible, noninvasive, and inexpensive method to assess body fat mass and visceral fat, explaining 80-90% of variance in fat mass compared to gold standards.

Bioelectrical Impedance Spectroscopy (BIS) is recommended for obesity trials as a feasible alternative to expensive imaging. It provides a good estimate of body fat and visceral fat, explaining up to 90% of the variance compared to gold-standard methods like DXA.

Calculated Resting Energy Expenditure (REE) using the Mifflin-St. Jeor equation is recommended over direct calorimetry for large clinical trials due to feasibility, though direct measurement is suggested if resources allow.

For large obesity trials, calculating Resting Energy Expenditure (REE) using the Mifflin-St. Jeor equation is the recommended standard. It is feasible, cost-effective, and correlates well with direct calorimetric measurements.

Physical activity improves metabolic health and reduces blood glucose levels independently of weight loss and insulin signaling pathways.

You do not need to lose weight to get the metabolic benefits of exercise. Even if your weight stays the same, physical activity helps your muscles take up glucose without relying on insulin, which is crucial for preventing or managing type 2 diabetes and metabolic syndrome. Focus on consistency rather than just the number on the scale.

Humans exhibit sensitivity to meal energy density (ED) by adjusting meal size to minimize acute aversive effects of overconsumption, specifically through a nonlinear relationship where calorie-content signals dominate at high EDs (>1.41-1.75 kcal/g).

Your body naturally regulates intake based on how energy-dense your food is. When you eat foods with high energy density (above ~1.5 kcal/g), your body uses calorie-sensing signals to reduce your meal size, preventing overconsumption. This is a learned and biological response, not just stomach volume. Focus on understanding that high-energy foods trigger different satiety signals than low-energy, high-volume foods.

Anti-obesity medications and bariatric surgery improve Obstructive Sleep Apnea (OSA) severity, measured by Apnea-Hypopnea Index (AHI), in direct proportion to the percentage of body weight lost, regardless of the specific intervention type.

If you have OSA and are overweight, losing weight through medication or surgery will improve your sleep apnea severity. For every 1% of body weight you lose, your Apnea-Hypopnea Index (AHI) drops by about 0.45 events per hour. This benefit is consistent whether you lose the weight through medication or surgery, meaning you can choose the method that fits your lifestyle and risk tolerance while expecting similar proportional improvements in your sleep apnea.

Metabolic adaptation (reduced energy expenditure beyond that predicted by body composition changes) occurs during active weight loss but typically normalizes after body weight stabilizes, although it may persist long-term in specific contexts such as extreme caloric restriction.

When you lose weight, your body burns fewer calories, but this is largely because you weigh less and have less metabolically active tissue. While your metabolism may stay lower than it was at your starting weight for a while, it often normalizes once your weight stabilizes. Don't assume long-term failure is inevitable; focus on maintaining your new weight, as the metabolic penalty is often overstated and may resolve over time.

Low-carbohydrate diets lead to significant short-term reductions in body weight, BMI, and waist circumference in overweight/obese T2DM patients, but these advantages may attenuate over the long term (6-24 months) compared to balanced low-calorie diets.

You can expect to lose weight, BMI, and waist circumference quickly in the first few months on a low-carb diet. However, do not be discouraged if your weight loss slows down after 6 months; studies show that over the long term, your results will likely be similar to those of any balanced, calorie-controlled diet. The key is sustainability and adherence rather than expecting indefinite rapid loss.

Intensive lifestyle intervention in patients with Type 2 Diabetes and obesity does not significantly reduce major cardiovascular events compared to standard care, although weight loss of 10% or more is associated with a lower risk.

For Type 2 Diabetes patients, intensive lifestyle changes alone may not significantly reduce heart events compared to standard care, unless you achieve at least 10% weight loss. Focus on sustainable weight loss and combine lifestyle changes with medical therapies for best heart protection.

Intermittent fasting variants (ADF, TWF, TRE) produce weight and fat loss effects equivalent to daily caloric restriction (DCR) when total energy intake is matched, with no inherent metabolic advantage to fasting timing.

Use intermittent fasting if it helps you eat less, not because you think it burns fat faster. If you can maintain a caloric deficit with standard meal timing, you will lose fat at the same rate. Prioritize protein intake and resistance training to protect muscle, as fasting does not inherently spare muscle.