Browse the evidence

Adipose tissue acts as an endocrine organ secreting adipocytokines (e.g., TNF-alpha, resistin, adiponectin) that modulate insulin sensitivity and beta-cell function.

Fat cells are active organs that release signaling molecules. Low levels of beneficial adiponectin and high levels of inflammatory cytokines in obesity contribute to insulin resistance. Treatments that increase adiponectin (like thiazolidinediones) or reduce inflammation may help.

Direct-to-consumer prescription drug advertising (DTCA) systematically minimizes the efficacy of lifestyle interventions and frames medication as the sole or superior means to regain control, thereby promoting medicalization over behavioral modification.

Be aware that drug advertisements are designed to make you feel that lifestyle changes are not enough. They portray characters who are 'out of control' until they take the drug. This is a marketing tactic, not necessarily a medical reality. For many conditions, lifestyle changes are effective first-line treatments. Do not let ads convince you that medication is the only path to health or control.

Defective hypothalamic autophagy promotes obesity and insulin resistance by activating the IKKβ/NF-κB inflammatory pathway, leading to increased energy intake and reduced energy expenditure.

Maintaining healthy autophagy in the brain may be important for metabolic health. While direct interventions are not specified, lifestyle factors that support cellular health (like exercise and balanced nutrition) might help maintain hypothalamic autophagy, thereby supporting normal energy balance and preventing obesity-related inflammation.

The efficacy of MC4 receptor agonists in reducing food intake is attenuated in subjects with high adiposity or those consuming high-fat diets, suggesting the system regulates a defended body fat set point.

If you are obese or eat a high-fat diet, standard appetite-suppressing drugs targeting the MC4 receptor may not work well because your body defends its current weight. Treatment might need to address the underlying adiposity or diet composition first, as the brain's 'off switch' for eating becomes less sensitive in high-fat states.

In obese adults, neither daily breakfast nor extended morning fasting results in significant changes in body weight or body composition over 6 weeks.

If your goal is weight loss, simply eating or skipping breakfast (within the parameters of this study) will not make a difference in your body weight over 6 weeks. Both groups gained weight, suggesting that meal timing alone is not a sufficient weight loss strategy for obese adults.

Consumption of dairy foods is not consistently associated with an increased risk of cardiovascular disease (CVD) or coronary heart disease (CHD), despite contributing to saturated fat intake.

You do not need to eliminate dairy to protect your heart. Current evidence does not support a blanket recommendation to avoid dairy fats for CVD prevention. Focus on the type of dairy (e.g., fermented vs. butter) and overall diet quality rather than fearing dairy itself.

Replacing saturated fat from dairy with carbohydrates does not improve cardiovascular risk profiles and may worsen them by lowering HDL and increasing small dense LDL.

Do not simply swap high-fat dairy for high-carb low-fat alternatives expecting heart health benefits. This substitution often fails to improve risk markers and may lower protective HDL cholesterol. Prioritize whole food sources and polyunsaturated fats if modifying fat intake.

Adrenergic stimulation (norepinephrine) induces mitochondrial fission in brown adipocytes, which acts as an essential amplification pathway for energy expenditure and thermogenesis.

Brown fat activation relies on hormonal signals (like cold exposure or stress) that trigger mitochondrial restructuring (fission). Simply consuming fats does not activate this pathway in the body. To leverage brown fat, focus on stimuli that trigger the sympathetic nervous system, such as cold exposure, rather than just dietary fat intake.

Adaptive thermogenesis during overfeeding does not significantly increase resting energy expenditure (REE) or diet-induced thermogenesis (DIT); instead, energy dissipation occurs primarily through increased activity-related energy expenditure (AEE).

Eating more than you need does not significantly boost your resting metabolism. Instead, your body stores most of the excess energy as fat or increases your physical activity (EAT). This asymmetry means it is easier to gain weight than to lose it, as your body defends against weight loss more aggressively than it defends against weight gain.

During weight loss maintenance, adaptive thermogenesis is driven by low leptin levels associated with reduced fat mass, leading to decreased non-resting energy expenditure (AEE) and increased muscle work efficiency.

After losing weight, your body defends its new, lower weight by reducing energy expenditure, particularly through increased muscle efficiency and reduced activity-related energy expenditure. This is driven by low leptin levels due to reduced fat mass. This metabolic adaptation makes long-term weight maintenance challenging.

Adherence to a low carbohydrate-high protein diet is associated with a statistically significant increase in the incidence of overall cardiovascular disease in women.

If you are a woman following a low-carb, high-protein diet for weight loss, be aware that this study links this specific dietary pattern to a higher risk of heart disease and stroke over the long term. The risk appears to increase as you decrease carbs and increase protein. Consider reviewing the sources of your protein (animal vs. plant) and carbohydrates (refined vs. complex), as the study suggests these factors may modify the risk.

Obesity negatively impacts female reproduction through endocrine mechanisms involving adipokines (leptin, adiponectin), insulin resistance, and altered steroid metabolism, leading to anovulation and increased miscarriage risk.

Obesity affects fertility through biological mechanisms, not just weight. Adipose tissue releases hormones (adipokines) and alters steroid metabolism, which can disrupt ovulation and increase miscarriage risk. Management involves diet and exercise to improve metabolic health, which may restore ovulation. Even if conception occurs, obese women face higher risks of pregnancy complications like gestational diabetes and hypertension.

BNip3 regulates lipid metabolism by balancing mitochondrial mass and function; its absence leads to increased lipogenesis and reduced fatty acid oxidation.

A healthy liver efficiently burns fat and synthesizes lipids only when needed. Disruptions in mitochondrial quality control can tip this balance, leading to fat accumulation even without overeating.

Fasting-induced hypoglycemia triggers tanycytes to upregulate VEGF-A, which increases fenestration of hypothalamic blood vessels and reorganizes tanycytic tight junctions to allow direct access of circulating metabolic hormones (e.g., leptin, ghrelin) to appetite-regulating neurons.

Your brain has a dynamic system that monitors your energy status. When you fast or have low blood sugar, your brain cells (tanycytes) temporarily open the 'windows' to your hypothalamus, allowing hunger and satiety hormones (like leptin and ghrelin) to directly signal your brain to adjust your appetite. This is a natural, adaptive response to ensure you eat when energy is low.

Leptin regulates body weight and energy expenditure by acting as a negative feedback signal from adipose tissue to the brain, inhibiting food intake and stimulating energy expenditure via hypothalamic pathways involving NPY, CRH, and the melanocortin system.

Understand that your body has a biological thermostat for fat stores (leptin). In obesity, this signal is often resistant, meaning high levels of the hormone don't effectively tell the brain to stop eating. This is a physiological barrier, not just a lack of willpower, explaining why weight loss is difficult despite high caloric intake.

Obese individuals typically exhibit high circulating leptin levels (hyperleptinaemia) due to increased fat mass, yet fail to lose weight, indicating a state of leptin resistance rather than deficiency.

If you are obese, your leptin levels are likely high, not low. Your body is resistant to the signal. Simply having more leptin (or taking supplements) will not work because the signal is already present but ignored. Focus on strategies that may improve sensitivity rather than assuming a deficiency.

FAT/CD36 (CD36) facilitates long-chain fatty acid (LCFA) uptake into skeletal muscle mitochondria, a process distinct from and potentially upstream of the Carnitine Palmitoyltransferase I (CPTI) system.

Your muscles use a protein called CD36 to move fatty acids into the mitochondria to be burned for energy. This process is crucial for endurance and metabolic health. While you cannot directly 'dose' CD36 like a supplement, regular exercise (both acute and chronic) increases the amount of CD36 in your mitochondria, thereby enhancing your muscle's ability to oxidize fat. This suggests that training improves your body's efficiency in using fat as fuel.

Vitamin C (ascorbic acid) acts as a potent antioxidant that regenerates Vitamin E and prevents lipid peroxidation, thereby protecting cell membranes and DNA from oxidative damage.

Eat fruits high in Vitamin C, such as strawberries, oranges, and black currants, to support your body's antioxidant defenses and protect cells from damage.

Bariatric surgery alters drug absorption and bioavailability, casting doubt on the validity of standard drug dosages for medications like antidepressants, antimicrobials, and metformin.

After bariatric surgery, your body absorbs medications differently. Do not assume your current dose is correct. Talk to your doctor about adjusting dosages for antidepressants, antibiotics, or other common drugs to ensure they are effective.

Insulin manipulation (restriction) to control weight in Type 1 Diabetes leads to chronic hyperglycemia, increased morbidity, and a threefold increase in relative risk of death.

If you have Type 1 Diabetes, never restrict your insulin to lose weight. This practice, known as 'diabulimia,' causes severe health complications and triples your risk of death. If you are struggling with body image or weight, seek help from a mental health professional or a diabetes specialist who can help you manage your weight safely without compromising your blood sugar.

Triaxial accelerometers (Tritrac), uniaxial accelerometers (CSA), and pedometers (Yamax) significantly underestimate physical activity-related energy expenditure (PAEE) in free-living women compared to the doubly labeled water (DLW) method.

Do not rely on consumer accelerometers or pedometers to determine your exact caloric expenditure for diet planning. While they are useful for tracking relative activity trends (e.g., walking more than yesterday), they systematically underestimate energy expenditure in free-living conditions, particularly for activities involving static loads or non-ambulatory movements. Use them for consistency, not absolute accuracy.

Ectopic fat accumulation in non-adipose tissues (liver, muscle, pancreas) drives insulin resistance and organ dysfunction through lipotoxicity, mediated by toxic lipid derivatives like diacylglycerol (DAG) and ceramides.

Excess fat stored in organs like the liver and muscles is dangerous because it produces toxic byproducts that block insulin. Managing overall caloric intake and increasing physical activity can help reduce this ectopic fat and improve metabolic health.

Restoring blood glucose levels during exercise via infusion eliminates hypoglycemic symptoms but does not significantly extend performance time, indicating that cerebral hypoglycemia is not the sole limiter of endurance performance.

Drinking glucose during exercise helps prevent feeling dizzy or weak from low blood sugar, but it won't necessarily help you run longer if your muscles have already run out of glycogen. Focus on eating enough carbs before your event.

Leptin administration in leptin-deficient patients normalizes brain activation patterns in response to food cues, reducing the motivational salience of food.

Leptin treatment doesn't just burn fat; it changes how your brain perceives food. Within days of starting treatment, the brain's reward response to food images normalizes, making it easier to resist food cues even before significant weight loss occurs.