Browse the evidence

Clenbuterol is used by 70% of steroid users as a secondary anabolic agent for its protein deposition and thermogenic properties.

Clenbuterol is frequently used by steroid users alongside steroids for fat loss and muscle preservation, often combined with ephedrine.

PPARα activation promotes fatty acid oxidation and energy expenditure, particularly in the liver and brown adipose tissue, contributing to the treatment of hypertriglyceridemia and obesity-induced insulin resistance.

PPARα activation (e.g., via fibrates) can help manage high triglycerides and improve energy expenditure. This is particularly relevant for those with metabolic syndrome.

Caloric restriction increases PPARγ expression in inguinal fat, promoting white fat browning, which may mimic some longevity benefits of caloric restriction.

Caloric restriction increases PPARγ in fat, helping it burn more energy (browning). This might be one reason CR helps you live longer and stay healthier.

Very Low Calorie Diets (VLCDs) under 800 kcal/day lead to rapid weight loss but result in significant loss of lean mass and are associated with poor long-term weight maintenance compared to moderate restriction.

Avoid diets under 800 kcal/day unless medically supervised. They cause rapid loss but are hard to maintain and may harm muscle mass. Moderate restriction (1200+ kcal) is safer and more sustainable.

Time-Restricted Feeding (TRF) aligned with the active period improves metabolic health markers (body weight, cholesterol, insulin levels) in mice without reducing overall food intake.

Consider Time-Restricted Feeding (TRF) by limiting your eating window to 8 hours per day, ideally aligned with your active period. This approach can improve metabolic health markers like body weight and cholesterol without requiring caloric restriction, by aligning food intake with your body's circadian rhythms.

Obese adolescents exhibit distinct metabolic pathway enrichment in their gut microbiota, specifically involving primary bile acid biosynthesis and carbohydrate metabolism (fructose, mannose, galactose), compared to normal weight adolescents.

The gut bacteria of obese adolescents are metabolically active in ways that may promote weight gain, specifically by breaking down sugars and producing primary bile acids. This suggests that dietary interventions for adolescents should consider not just total calories, but the specific types of carbohydrates and fats that feed these bacterial pathways.

A 45-year decline in household management energy expenditure (HMEE) in women, driven by automation and increased workforce participation, has contributed to the rise in obesity by creating a chronic positive energy balance that is not fully offset by increases in leisure-time physical activity.

Recognize that modern conveniences (dishwashers, microwaves, pre-packaged foods) and increased workforce participation have significantly reduced your daily energy expenditure, even if you don't feel 'active.' To maintain weight, you cannot rely on housework alone; you must intentionally incorporate physical activity into your routine, as leisure-time exercise has not historically compensated for these losses.

The evolution of the large human brain required high-quality energy sources (meat/fat) and efficient metabolic systems, which co-evolved with the ability to store fat, creating a biological predisposition to obesity in modern environments.

Your large brain requires significant energy. Evolutionarily, this was supported by efficient fat storage. In modern times, this means your biology is optimized for survival in scarcity, making weight management challenging in an environment of abundance.

Urbanization-driven reductions in physical activity (PAL) of 400-800 kcal/day are the primary driver of population-level obesity, outweighing individual behavioral choices.

Focus on environmental changes rather than just individual willpower. If you live in an urban area, recognize that your daily energy expenditure is likely significantly lower than previous generations due to transport and work changes. Compensate by consciously increasing physical activity or adjusting food intake to match this new baseline.

Ectopic expression of brown adipose tissue uncoupling protein 1 (UCP1) in skeletal muscle or white adipose tissue promotes fatty acid oxidation and confers resistance to diet-induced obesity.

Current science shows that artificially inducing brown fat proteins (UCP1) in muscle or white fat can prevent obesity in mice, but this is not yet a viable human treatment. Do not rely on 'beiging' strategies for weight loss until safe, effective pharmacological induction methods are developed.

Moderate induction of UCP1 in human white adipocytes via PPARγ co-activator-1 increases palmitic acid oxidation and may increase metabolic energy expenditure.

Research indicates that inducing UCP1 in white fat can double fatty acid oxidation in lab settings. However, this is currently an experimental concept using genetic vectors, not a available treatment. Focus on proven methods like caloric deficit and exercise.

Implementing excise taxes on sugar-sweetened beverages (SSBs) in middle-income countries reduces net energy intake and prevents further growth in obesity prevalence, though it does not permanently reduce population weight.

For policymakers in middle-income countries, implementing an excise tax on sugary drinks is an effective strategy to halt the rise in obesity rates. While it won't cure existing obesity, it reduces net calorie intake by making sugary drinks more expensive, leveraging consumer price sensitivity. The key is that the tax must be structured to pass through to consumer prices.

Pharmacological inhibition or genetic deficiency of Stearoyl-CoA desaturase 1 (SCD1) reduces body adiposity and prevents diet-induced obesity by increasing energy expenditure and fatty acid oxidation.

Current research suggests that targeting the SCD1 enzyme could be a viable strategy for treating obesity. In animal models, reducing SCD1 activity leads to increased fat burning and resistance to weight gain, even with high food intake. While not yet a human treatment, this highlights the importance of lipid metabolism enzymes in body weight regulation.

Brown adipose tissue oxygen consumption and energy expenditure are directly linked to its blood flow and the uptake of circulating non-esterified fatty acids (NEFA), both at rest and during cold exposure.

If you have active brown fat, its ability to burn calories is tightly coupled to how much blood flows to it and how many fatty acids are available in your blood. Cold exposure increases blood flow and fatty acid uptake, which drives this process. However, since the total energy burned is small, this mechanism does not translate to significant weight loss.

Chronic low-grade inflammation in obesity serves a beneficial physiological function by increasing energy expenditure and promoting adipose tissue remodeling, thereby limiting adiposity and improving glucose homeostasis.

Do not assume that suppressing all inflammation is beneficial for weight management. In obesity, inflammatory processes help regulate energy expenditure and tissue health. Suppressing these signals (e.g., via certain anti-inflammatory drugs) may inadvertently reduce energy expenditure and promote weight gain, potentially worsening metabolic outcomes.

Proinflammatory cytokines such as TNF-alpha, IL-1, IL-6, and leptin contribute to increased energy expenditure and reduced food intake, which counteracts obesity.

Elevated levels of certain inflammatory markers (like IL-6 during exercise) may actually aid in weight management by boosting energy expenditure. Suppressing these markers unnecessarily might hinder weight loss efforts.

Inhibition or genetic deletion of the enzyme Stearoyl-CoA Desaturase 1 (SCD1) confers resistance to diet-induced obesity and hepatic steatosis by increasing fatty acid oxidation and thermogenesis.

This paper highlights SCD1 as a key enzyme. While you cannot directly 'dose' SCD1 inhibition safely without medical supervision, consuming oleic acid (via olive oil) may naturally modulate this pathway. The research suggests that high SCD1 activity is linked to obesity, so maintaining healthy levels through diet (oleic acid) is preferable to high SCD1 activity driven by saturated fats.

Hypercaloric fructose feeding does not significantly affect mean arterial blood pressure compared to other carbohydrates.

Even when consuming excess calories from fructose, mean arterial blood pressure does not significantly change compared to other carbohydrates in the short term.

High levels of sedentary behavior, particularly television watching, are integral to family life and serve as a primary barrier to physical activity in low-income immigrant Latino children.

Parents should be encouraged to limit screen time and use TV as an educational tool rather than a babysitter. Interventions should provide alternative, low-cost activities for children, especially when parents are working.

Gut microbiota composition influences obesity risk through energy harvesting efficiency, specifically via the Firmicutes-to-Bacteroidetes ratio and short-chain fatty acid (SCFA) production.

Focus on dietary diversity and fiber intake to support a healthy gut microbiome. While not a magic bullet, a diet rich in prebiotics and probiotics may help regulate energy balance and reduce obesity risk by influencing gut bacteria composition.

Standard interventions that alter energy intake or expenditure (diet or aerobic exercise) cannot distinguish between a unique fixed point model and an invariant manifold model because both yield identical mass change trajectories.

You cannot determine your body's underlying composition dynamics (whether it has a unique set point or flexible states) just by watching how your weight changes when you diet or exercise. Both theoretical models predict the same weight loss curve for energy changes. To understand your body's specific dynamics, you would need to perturb body composition directly (e.g., via resistance training or hormonal changes), not just energy balance.

In severe diabetes, reduced cardiac lipoprotein lipase (LPL) activity forces cardiomyocytes to rely on non-esterified fatty acids (NEFA) from adipose tissue, causing mitochondrial overload, lipid metabolite accumulation, and cardiac lipotoxicity.

In severe diabetes, the heart's ability to process fat from blood lipids (via LPL) drops. This forces the heart to burn fat directly from the blood (NEFA), which it cannot handle efficiently, leading to damage. Treatments must focus on restoring this specific fat-processing pathway in the heart, not just lowering overall blood fat.

Further investigation is needed to confirm the presence and magnitude of other disease outcomes related to TFA consumption.

More research is necessary to fully understand the health impacts of TFA.

The new user rate of semaglutide (Ozempic ® ) remained stable at approximately 4 per 1000 adult person-years between 2019 and 2021 and then peaked at 10 per 1000 in the first quarter of 2023.

Practitioners should be aware of the increasing trend in semaglutide prescriptions, particularly in 2023.