Browse the evidence

Combining two specific night eating habits—dinner within 2 hours of bedtime and snacks after dinner (each occurring ≥3 times/week)—significantly increases the odds of developing obesity (BMI ≥25 kg/m²) and dyslipidemia in both men and women, with a supra-additive interaction effect observed in women.

If you frequently eat dinner within 2 hours of bed and snack after dinner (3+ times a week), you are at a significantly higher risk for obesity and high cholesterol, especially if you are a woman. To mitigate this, try to finish your last meal earlier in the evening and avoid late-night snacking. This is particularly important for women, where the combination of these habits showed a synergistic negative effect.

High levels of sedentary behavior, specifically television viewing, are independently associated with an increased risk of becoming overweight, regardless of the amount of nonsedentary physical activity performed.

Limit your television viewing time. Even if you exercise, watching TV for more than 21 hours a week significantly increases your risk of gaining weight. Try to keep TV viewing to under 1 hour per week for optimal weight maintenance.

Increasing nonsedentary activity by 10 MET-hours per week predicts a small but significant decrease in BMI (approx 0.03 units), whereas increasing TV viewing by 10 hours per week predicts a small but significant increase in BMI (approx 0.05 units).

Small changes in behavior add up. Adding just one hour of moderate exercise (like squash or running) per week can help lower your BMI slightly, while cutting 10 hours of TV time can prevent a small BMI increase. Focus on these small, sustainable shifts.

Low-T3 syndrome in exercising women is induced abruptly when energy availability falls below a threshold of 19.0–25.0 kcal/kg lean body mass per day, regardless of exercise volume or intensity.

If you exercise regularly, your thyroid health depends on 'energy availability'—the calories you eat minus the calories you burn in exercise. If this number drops below roughly 30 kcal per kg of lean body mass, your body may switch into 'low-T3 syndrome,' slowing metabolism. To prevent this, you must either eat more to cover your exercise costs or reduce your exercise volume, as simply eating more without covering the exercise cost may not be enough if the gap is too wide.

Intermittent fasting and time-restricted feeding activate AMPK and improve health outcomes by mimicking some benefits of caloric restriction without necessarily reducing total calories.

Try eating all your meals within a restricted window of time each day (e.g., 8 hours). This activates AMPK, a key energy sensor, which can improve health and function even if you don't count calories.

Brown adipose tissue (BAT) actively clears circulating triglycerides and disposes of glucose, thereby reducing risk factors for metabolic syndrome and obesity.

Maintaining or recruiting brown adipose tissue (BAT) may help manage blood sugar and fat levels. While cold exposure is a known activator, the key takeaway is that BAT is a metabolic organ in adults that can clear dietary fats and glucose. Strategies to keep BAT active (like mild cold exposure) might support metabolic health, particularly for those with obesity or metabolic syndrome risk.

Gut microbiota composition influences obesity and diabetes risk through mechanisms including energy harvesting, regulation of fat storage, and induction of metabolic endotoxemia.

Maintaining a diverse gut microbiome through diet may help regulate energy extraction and satiety hormones. While not a substitute for healthy eating, a healthy microbiome may support metabolic health and reduce inflammation associated with obesity.

Caffeine enhances contractile force during submaximal contractions by potentiating calcium release from the ryanodine receptor, independent of habitual caffeine consumption.

If you consume caffeine before exercise, it may help your muscles produce more force during submaximal efforts by improving calcium release in muscle cells. This benefit applies regardless of whether you drink coffee regularly.

Caffeine ingestion increases 24-hour energy expenditure and lipid oxidation in lean women, but this thermogenic response is significantly blunted in duration and magnitude in obese women.

If you are obese, caffeine will still increase your daily energy expenditure and fat burning, but the effect is about half as strong as it is in lean individuals, and it does not extend into the night. Do not rely on caffeine alone for weight loss in obesity; its utility as a thermogenic agent is significantly diminished compared to lean populations.

High protein intake significantly increases energy expenditure (thermogenesis) primarily through the energetic costs of protein turnover, ureagenesis, and gluconeogenesis.

If you are trying to lose fat, increasing protein intake can help by increasing your daily energy expenditure through the thermic effect of food. This is due to the high energy cost of processing amino acids into urea and glucose.

Long-term caloric restriction (25% reduction) slows the pace of biological aging as measured by DunedinPACE in healthy adults, though it does not significantly alter static biological age estimates from PhenoAge or GrimAge clocks.

If you can sustain a moderate calorie deficit (even around 10-15%), it may slow the rate at which your body ages biologically, as measured by specific epigenetic markers. This does not necessarily reverse your current biological age, but it may slow the accumulation of age-related damage. Consistency over two years is key, and behavioral support helps maintain the deficit.

Triaxial accelerometry provides significantly higher accuracy in predicting total energy expenditure (TEE) and activity-related energy expenditure (AEE) in free-living conditions compared to uniaxial accelerometry.

If you are tracking energy expenditure or physical activity levels in a real-world setting, use a triaxial accelerometer (measuring movement in all three planes: vertical, mediolateral, and anteroposterior) rather than a simple pedometer or uniaxial monitor. The additional axes capture non-walking movements (like arm swings or twisting) that uniaxial devices miss, leading to a significantly more accurate estimate of your total energy expenditure.

A 24-hour fast blunts NLRP3 inflammasome activation in human subjects by activating SIRT3, which enhances mitochondrial integrity and reduces ROS, whereas refeeding primes the inflammasome via NF-κB signaling.

A 24-hour fast reduces markers of sterile inflammation (NLRP3) in healthy people by activating a specific protein (SIRT3) that protects mitochondria. If you are healthy, a single day of fasting may have anti-inflammatory benefits compared to eating normally, provided you do not have underlying conditions that contraindicate fasting.

High intensity (HI) exercise yields larger improvements in cardiorespiratory fitness (peakVO2) than low-to-moderate intensity (LMI), suggesting a dose-response relationship, although the difference was not statistically significant.

If your main goal is to improve your heart and lung capacity (peakVO2), high intensity exercise is likely more effective than low-to-moderate intensity. While the study did not find a statistically significant difference, the trend favors HI. If you can tolerate it, HI may offer a slight edge for cardiorespiratory gains.

High dietary restraint is associated with controlled eating and frequent dieting but does not cause adverse metabolic or psychological health effects, whereas high disinhibition (episodic overeating) is associated with extreme adiposity, blunted thermic effect of food, and reduced physical activity.

Focusing on strict dietary control (restraint) does not inherently harm your metabolism or health. The primary driver of obesity and metabolic inefficiency (like a blunted thermic effect of food) is episodic overeating (disinhibition), not the act of dieting itself. Successful weight management likely involves maintaining restraint to prevent these episodes of loss of control.

Calorie restriction and specific dietary patterns (e.g., low-protein/Mediterranean) extend lifespan and healthspan in model organisms and are associated with exceptional human longevity in specific geographic regions.

Adopt a diet that mimics the effects of calorie restriction, such as the Mediterranean diet, which is low in protein and high in nutrients. This may activate longevity pathways like IGF-1 and FOXO, potentially extending healthspan.

A typical hatha yoga session (averaging 2.5 METs and 49.4% max heart rate) does not meet the intensity recommendations for improving or maintaining cardiovascular fitness.

If your goal is to improve cardiovascular fitness or meet standard health activity guidelines, a standard hatha yoga class is likely not intense enough on its own. While yoga offers many health benefits, you should pair it with other activities that elevate your heart rate to at least 50-60% of your maximum (moderate intensity) to ensure you are getting the cardiovascular benefits recommended by health organizations.

Sun salutation postures within a yoga session can reach moderate intensity levels (approx. 3.0 METs and 55% max heart rate), potentially contributing to cardio-respiratory fitness in unfit individuals.

If you practice yoga, focus on the dynamic sequences like Sun Salutations. These specific poses can reach moderate intensity levels suitable for cardiovascular health, especially if you are new to exercise. However, be aware that this intensity level may not be sufficient for maintaining fitness if you are already physically fit.

Standard predictive equations for resting metabolic rate (RMR) overestimate energy requirements in chronic spinal cord injury (SCI) patients by 5–32%, primarily due to reduced fat-free mass and altered sympathetic nervous system activity.

Do not use standard calorie calculators for spinal cord injury. They will overestimate your needs by up to 32%, leading to weight gain. You need a metabolic cart measurement or a validated SCI-specific equation to determine your true resting metabolic rate.

Antiretroviral therapy (ART) improves BMI and helps regain muscle mass, but weight loss can still occur in a significant proportion of patients on ART, necessitating concurrent nutritional interventions.

Starting ART is a crucial step, but it does not guarantee weight stability. Many patients continue to lose weight or develop wasting even after starting treatment. To maximize health outcomes, combine ART with a balanced diet, physical activity, and management of side effects to ensure adequate energy intake and muscle preservation.

Carriers of the FTO SNP rs8050136 risk allele (A-allele) exhibit significantly higher energy intake during dietary restriction compared to non-carriers, whereas energy expenditure is not independently affected after adjusting for lean body mass.

If you carry the FTO risk variant, you may naturally consume more calories, particularly when dieting. Focus on monitoring intake and satiety cues, as your body may not signal fullness as effectively as non-carriers.

Lactating women with adequate fat reserves can sustain milk volume and energy output despite moderate negative energy balance (gradual weight loss up to 0.5 kg/week) without adverse effects on lactation performance.

If you are breastfeeding and have healthy body fat levels, you can safely lose weight at a moderate pace (up to 1 pound per week) without harming your milk supply. Your body will use stored fat to help produce milk. Avoid rapid weight loss or very low calorie intakes (below 1500 kcal/day) if you want to ensure volume remains stable.

Mitochondrial/ER localization of 1,2-DAGs is positively related to insulin sensitivity, whereas mitochondrial ceramide accumulation is inversely related.

Mitochondrial health is crucial for insulin sensitivity. The presence of certain lipids (1,2-DAGs) in the mitochondria is associated with better insulin sensitivity, possibly by supporting mitochondrial dynamics. This suggests that supporting mitochondrial function through exercise may be more important than simply lowering total muscle fat.

Activation of metabolically active brown adipose tissue (BAT) in adult humans increases energy expenditure via UCP1-mediated thermogenesis, thereby counteracting weight gain and obesity.

You likely have metabolically active brown fat, even if you are an adult. This tissue burns energy as heat, helping to regulate your weight. While you cannot 'buy' brown fat, keeping your living environment moderately cool (cold exposure) may stimulate it. However, be aware that BAT activity decreases with age and higher body weight, which may contribute to weight gain over time. It is not a magic bullet, but a biological lever you can influence.