Browse the evidence

The improvements in LDL particle size and VLDL mass resulting from weight loss are primarily driven by the reduction in body mass index (adiposity) rather than the method of weight loss (exercise vs. diet).

For improving LDL particle size and reducing VLDL, the method of weight loss (exercise vs. diet) matters less than achieving the weight loss itself. Both approaches yield similar benefits for these specific markers when the amount of weight lost is the same. However, you should still exercise because it provides additional HDL2 benefits that diet alone does not.

Nonexercise activity thermogenesis (NEAT) serves as a primary biological regulator of body weight by modulating energy expenditure in response to positive or negative energy balance, thereby counterbalancing fat gain or loss.

Focus on increasing your daily non-exercise movement. This includes standing, walking to work, fidgeting, and doing chores. These activities collectively burn significantly more calories than structured exercise for most people. To manage weight, ensure your daily environment encourages movement rather than sedentary convenience.

Dysbiosis, characterized by an altered gut microbiota composition, contributes to the development of diabetes and obesity by disturbing energy balance and promoting inflammation.

Your gut health is a key player in your metabolic health. A diverse and balanced microbiome helps regulate energy, inflammation, and insulin sensitivity. Focus on a diet rich in fiber and diverse plant foods to support a healthy gut ecosystem.

Chronic cold acclimation increases the volume and oxidative capacity of metabolically active brown adipose tissue in humans, leading to increased energy expenditure and improved insulin sensitivity.

Engage in chronic mild cold exposure (around 19°C or 66°F) for extended periods daily. Over time, this increases the volume and oxidative capacity of your brown fat, boosting your resting energy expenditure and improving how your body handles insulin after meals. This is a sustainable, non-pharmacological way to leverage your body's natural thermogenic machinery.

A daily intake of 600 mg caffeine combined with 270-1200 mg EGCG (from green tea and Guarana extracts) significantly increases 24-hour energy expenditure by approximately 750 kJ (8%) in healthy men compared to placebo, but does not significantly increase fat oxidation or heart rate.

Taking a supplement containing 600mg of caffeine and 270-1200mg of EGCG (from green tea/Guarana) three times a day before meals will increase your total daily energy expenditure by about 750 kJ (roughly 180 kcal). However, this does not translate to increased fat burning (lipid oxidation) and higher doses of EGCG do not provide extra metabolic benefits. Be aware of a slight increase in diastolic blood pressure, though heart rate remains stable.

Caloric restriction downregulates inflammatory gene expression in adipose tissue and PBMCs, including markers like IL-6, IL-8, and TNF-related proteins, often requiring sustained periods (e.g., 28 days) to observe significant changes.

Sustained caloric restriction is a powerful tool for reducing inflammation. Focus on maintaining a caloric deficit for at least several weeks to see significant downregulation of inflammatory genes in fat tissue and blood cells.

Energy compensation following a preload is significantly determined by the intermeal interval (IMI) and the physical form of the preload, with semisolid and solid forms yielding higher compensation than liquids, particularly when the IMI is between 30 and 120 minutes.

To maximize fullness from a snack or meal, choose semisolid or solid foods (like yogurt, jelly, or whole fruits) and wait 30 to 120 minutes before your next meal. Liquid calories (smoothies, juices) are less effective at suppressing subsequent hunger, especially if consumed too close to the next meal.

Caloric restriction (CR) of 20-40% below ad libitum intake, while maintaining adequate nutrient intake, improves cardiovascular and glucoregulatory biomarkers and extends lifespan in animal models, with mixed but generally favorable effects on human health markers.

To potentially improve long-term health markers, consider reducing your daily caloric intake by 20-40% compared to your current maintenance level, while ensuring you still get all necessary vitamins and minerals. This is best done under guidance, and combining it with exercise (CE) may make it easier to stick to.

Ultra-processed foods are significantly more energy-dense, less nutrient-dense, and cheaper per calorie than unprocessed foods, creating an economic incentive for overconsumption.

Ultra-processed foods are engineered to be cheap, energy-dense, and nutrient-poor. This combination makes them highly palatable and economically attractive, driving overconsumption. To improve diet quality, prioritize unprocessed foods which, while more expensive per calorie, offer better nutrient density and lower energy density, helping to regulate caloric intake.

The body defends against energy imbalance by adaptively adjusting energy expenditure (specifically Basal Metabolic Rate and physical activity efficiency), meaning weight loss from caloric restriction or exercise is slower and less than predicted by simple linear energy density calculations.

Do not expect weight loss to be linear. When you cut calories or increase exercise, your body will lower its metabolic rate and activity efficiency to conserve energy. This means you will lose less weight than a simple '3500 calories = 1 lb fat' calculation predicts. Patience and consistency are required because your body actively resists the change.

Brown adipose tissue (BAT) is prevalent in adult humans and its activity increases energy expenditure through cold-induced thermogenesis, providing a potential therapeutic target for obesity.

Adults retain brown fat, primarily in the neck and collarbone area, which burns calories to generate heat. While you cannot 'exercise' it directly, exposing yourself to cold (e.g., cold showers, cooler room temperatures) can activate this tissue, slightly increasing your daily energy expenditure. This is not a weight-loss cure-all, but it is a biological mechanism that exists in most adults, contrary to old beliefs.

Caloric restriction (CR) is the only intervention shown to increase health span and decrease the risk of age-related diseases in nonhuman primates.

Caloric restriction, specifically a 15% reduction in calories, has been shown to slow metabolic aging and reduce oxidative damage in humans over a 2-year period. It is the only intervention proven to extend health span in nonhuman primates. However, adherence is difficult, leading to interest in mimetics and fasting-mimicking diets.

Carriers of the ADRB3 Trp64Arg polymorphism have a significantly higher risk of obesity when engaging in low levels of physical activity, but this risk is not apparent in active subjects.

If you carry the ADRB3 Trp64Arg variant, maintaining regular physical activity is crucial to mitigating your obesity risk. Sedentary behavior significantly amplifies your genetic risk, but being active appears to neutralize it.

High-calorie energy drinks may promote weight gain if the energy intake from the drink is not carefully considered as part of the total daily energy intake.

If your goal is weight loss, choose low-calorie energy drinks. If you consume high-calorie energy drinks, ensure you account for their calories in your daily diet to avoid weight gain.

Household food insecurity is significantly associated with higher rates of parental overweight and obesity, primarily driven by the consumption of cheaper, energy-dense foods and reduced access to nutrient-dense options.

If you are struggling to afford food, prioritize calorie density from healthy sources if possible, but recognize that the system makes healthy food more expensive per calorie. The risk of obesity in food-insecure households is real and driven by the economics of food, not just lack of knowledge. Look for programs that subsidize fruits and vegetables to make them more accessible.

A decrease in 24-hour Resting Metabolic Rate (RMR) during a very low energy diet predicts greater weight regain during the subsequent maintenance phase.

If you lose weight very quickly through severe restriction, your metabolism may slow down significantly. This makes it harder to keep the weight off. To mitigate this, avoid extreme deficits and focus on gradual weight loss to minimize metabolic adaptation.

Increasing the expression of PGC1a enhances fatty acid oxidation and mitochondrial function in peripheral tissues, which prevents lipotoxicity and improves insulin sensitivity.

Increasing PGC1a activity helps muscles and liver burn fat more efficiently, reducing the toxic buildup of lipids in organs and improving how the body handles glucose.

Adolescents with overweight or obesity exhibit significantly lower physical fitness scores across cardiorespiratory and agility tests compared to normal-weight peers, demonstrating a strong inverse association between excess body weight and fitness.

If you are an overweight adolescent, your current fitness levels are likely lower than your normal-weight peers, particularly in endurance and agility tasks. This is not a permanent state but a reflection of current energy balance and activity levels. To improve, focus on increasing physical activity in a way that respects your current physical limits and reduces the fear of judgment, as low fitness can be a barrier to participation.

Acetyl-L-carnitine (ALC) supplementation improves symptoms of diabetic neuropathy, including pain and nerve conduction, by enhancing neuronal energy metabolism and promoting nerve fiber regeneration.

If you have diabetic neuropathy, Acetyl-L-carnitine (ALC) may help reduce nerve pain and improve nerve function. It works by supporting the energy needs of nerve cells and promoting regeneration. It is generally well-tolerated.

High-fat diets rich in saturated fatty acids (e.g., lard) induce mitochondrial fission and dysfunction in liver and skeletal muscle, whereas diets rich in omega-3 polyunsaturated fatty acids (e.g., fish oil) promote mitochondrial fusion and improve function.

If you are consuming a high-fat diet, prioritize omega-3 polyunsaturated fatty acids (found in fish oil) over saturated fats (like lard). This choice supports mitochondrial fusion, which is associated with better metabolic function and reduced oxidative stress, whereas saturated fats tend to fragment mitochondria and impair function.

While daily intake does not track daily expenditure, total energy intake over a multi-week period significantly correlates with total energy expenditure in structured training environments.

Over the course of a few weeks, your total food intake will roughly match your total energy burn if you are in a structured environment with fixed meals and activities. However, this balance is not automatic day-to-day; it emerges only when looking at the aggregate over time.

Body weight changes are significantly related to calorie balance over a week, but daily weight changes only weakly explain daily calorie balance variations.

Your weekly weight change is a moderate indicator of your weekly calorie balance, but daily weight fluctuations are a poor indicator of daily calorie balance. Do not try to adjust your daily food intake based on daily scale readings.

Exercise increases mitochondrial function and decreases markers of Alzheimer's disease.

Engage in regular exercise to boost mitochondrial function. This specific adaptation helps decrease markers associated with Alzheimer's disease, offering a protective effect against cognitive decline.

Weight loss (WL) alone reduces glucose and insulin responses during an oral glucose tolerance test (OGTT) but does not improve insulin-mediated glucose disposal measured by hyperinsulinemic euglycemic clamp.

Losing weight through diet alone helps your body handle sugar loads better (improving oral glucose tolerance), but it may not improve how your muscles use insulin as effectively as exercise does. For best metabolic health, combine diet and exercise.