Browse the evidence

The degree of energy compensation increases with body fat mass (FM), with individuals at the 90th percentile of BMI compensating ~49% of activity calories compared to ~28% for those at the 10th percentile.

If you have higher body fat, your body will likely compensate more strongly for exercise by lowering your resting metabolism. This means exercise alone will be less effective for weight loss in higher-fat individuals. To lose weight, you likely need to combine exercise with dietary changes to create a deficit that overcomes this higher compensation rate.

The efficacy of the vegetable consumption app is moderated by baseline vegetable intake; users with higher baseline consumption benefit significantly more from the intervention.

If you already eat a decent amount of vegetables, a tracking app will likely boost your intake even more than if you eat few vegetables. The app's gamification resonates more with those who already value vegetables.

SSB intake is inversely correlated with national Socio-demographic Development Index (SDI) by 2018, meaning higher national development is associated with lower national SSB intake, though within lower-SDI nations, higher individual education correlates with higher intake.

If you are in a developing nation, be aware that SSB marketing often targets the educated and urban demographics. High individual education does not protect against high SSB intake in these regions; in fact, it may correlate with higher intake.

SSB intake is significantly higher in urban vs. rural areas globally (57.3% higher), with the largest disparities in Sub-Saharan Africa and South Asia, while being lower in urban areas of the Middle East/North Africa.

Urban dwellers, particularly in Africa and Asia, face higher exposure to SSBs. Focus on reducing availability and marketing in these high-density areas.

Warm-ups should be restricted to exercise-specific movements, and stretching should only be prioritized if the goal is to increase flexibility.

Skip generic warm-ups and static stretching unless you want more flexibility. Instead, do a few light sets of your specific exercises to warm up.

Higher BMI causally increases the risk of coronary heart disease (CHD), and this effect is significantly mediated by elevated triacylglycerol levels, higher HbA1c, and type 2 diabetes risk.

High body weight increases heart disease risk, but much of that risk comes from how it affects your blood fats (triglycerides) and blood sugar (HbA1c/Diabetes). Managing these specific metabolic markers is crucial for heart health, potentially more so than focusing on LDL cholesterol alone, which this study suggests isn't a primary mediator of BMI's effect.

Bariatric surgery reverses obesity-associated secondary hypogonadism (MOSH) in men, leading to increased total and free testosterone levels and improved sexual function.

If you are a severely obese man with low testosterone, bariatric surgery can naturally restore your hormone levels and sexual function by reversing the obesity that was suppressing your hormones.

Unilateral aerobic exercise (e.g., single-leg cycling) can elicit greater skeletal muscle metabolic adaptations than bilateral exercise when performed at the same relative intensity, due to the elimination of central limitations (bilateral deficit) that restrict workload in bilateral training.

If you are doing high-intensity aerobic training and want to maximize metabolic adaptations in your muscles, consider single-leg cycling or similar unilateral aerobic exercises. Because your heart and lungs limit how hard you can push when using both legs, using one leg at a time allows you to work that muscle harder, potentially leading to greater metabolic improvements.

Evening exercise training (18:30 hours) improves glycaemic control and reverses high-fat diet-induced metabolic perturbations in overweight/obese men, whereas morning exercise (06:30 hours) does not.

If your goal is optimizing blood sugar control and metabolic health, especially if you consume a high-fat diet, try to schedule your workouts for the evening (around 18:30). Morning exercise still improves your heart and lung fitness, but it may not offer the same metabolic protection against poor diet choices. If you must exercise in the morning, be mindful that it might not counteract the negative metabolic effects of a high-fat diet as effectively as evening training.

The cardiovascular benefits of low-carbohydrate diets diminish after 2 years of adherence, with no significant difference from control groups in weight or lipid profiles at that duration.

If you plan to follow a low-carbohydrate diet for more than two years, expect the weight loss and cardiovascular benefits to plateau and potentially disappear, largely due to the difficulty of maintaining strict adherence. Short-term adherence (under 11 months) yields the best results.

A dietary pattern characterized by high intake of sugar-sweetened beverages, fruit juice, and table sugar/preserves (but low in butter/high-fat cheese) is associated with increased risk of CVD and all-cause mortality, particularly in the highest consumption quintile, potentially independent of BMI and traditional risk factors.

Limit your intake of sugar-sweetened beverages, fruit juice, and table sugar/preserves. Even if you keep your saturated fat intake low, high consumption of these sugary items is linked to a higher risk of heart disease and early death, especially if you are in the highest consumption group. Choose water, unsweetened tea, or whole fruits instead.

Oral semaglutide (7-14 mg/day) provides glucose-lowering and weight-loss effects comparable to subcutaneous formulations, though with lower bioavailability requiring higher doses.

If you prefer pills over injections, oral semaglutide is an option. You must take it on an empty stomach before breakfast, which requires discipline. It uses a higher dose than the shot version to compensate for lower absorption.

Ultra-processed foods drive obesity primarily through their high glycemic load and disrupted cellular structure, which accelerates digestion and hormonal response, rather than just their energy density.

Minimize ultra-processed foods, especially those high in carbohydrates. Whole foods retain cellular structures that slow digestion and blunt glycemic spikes, reducing the hormonal drive for fat storage.

Roux-en-Y gastric bypass (RYGB) surgery produces the greatest long-term weight loss and is the most cost-effective intervention for severe obesity (BMI ≥ 35 kg/m2) compared to lifestyle interventions or pharmacotherapy.

For individuals with a BMI of 35 or higher, Roux-en-Y gastric bypass surgery is the most effective and cost-effective treatment for long-term weight loss, significantly outperforming lifestyle interventions and medication like orlistat. While it involves surgery and higher upfront costs, it leads to greater sustained weight reduction.

Ketogenic diets reduce body mass and fat mass primarily through appetite suppression and reduced energy intake, rather than through superior metabolic advantages over isoenergetic non-ketogenic diets.

If you use a ketogenic diet to lose weight, expect it to work because it helps you eat less, not because it burns fat faster. If you match the calories of a low-fat diet, you will lose the same amount of fat. Focus on the appetite-suppressing nature of the diet to maintain a caloric deficit.

Circadian misalignment and sleep loss disrupt peripheral clocks in skeletal muscle, leading to impaired mitochondrial function, reduced glucose tolerance, and increased insulin resistance.

Prioritize sleep for metabolic health. Poor sleep disrupts your body's internal clock, leading to worse blood sugar control and reduced mitochondrial efficiency. This happens even if you are eating well and exercising. Aim for 7-9 hours of quality sleep to support your metabolic function.

Vagal afferent signaling mediates nutrient-specific learning and satiation, and its blunting in obesity contributes to excessive weight gain, while targeted neuromodulation (stimulation or blockade) can reduce food intake and body weight.

Your gut communicates directly with your brain via the vagus nerve to regulate hunger and satiety. In obesity, this signal can become blunted. Therapies that stimulate this nerve (like non-invasive vagus nerve stimulation) or mimic gut hormones (like GLP-1 agonists) can help restore this signaling, reducing food intake and aiding weight loss. Focus on strategies that support gut-brain communication.

Using Rating of Perceived Exertion (RPE) for load prescription in resistance training yields small but probabilistically favorable strength gains compared to fixed percentage of 1RM loading, while producing equivalent hypertrophy.

If you are struggling to progress with fixed percentages, try switching to RPE. Instead of lifting 80kg for 8 reps, pick a weight that feels like a 7-8 on a 1-10 scale (where 10 is failure). If you hit the reps easily, increase the weight next session; if you miss reps, decrease it. This approach yielded slightly better strength gains in trained men over 8 weeks compared to fixed percentages, with no difference in muscle growth.

A 2-week ketogenic diet significantly upregulates adaptive immune pathways (T cell activation, oxidative phosphorylation) and alters microbiome amino acid metabolism, whereas a vegan diet upregulates innate immune pathways (antiviral responses, type I interferon) and erythrocyte differentiation.

Switching to a ketogenic diet for just two weeks shifts your immune system toward adaptive responses (T cells, oxidative phosphorylation), while a vegan diet shifts it toward innate/antiviral responses. This suggests diet can be used as a tool to modulate specific immune pathways, potentially relevant for managing inflammation or infection risk, though long-term disease outcomes require further study.

A ketogenic diet significantly downregulates microbial amino acid and vitamin biosynthesis pathways compared to a vegan diet, likely due to higher dietary availability of these nutrients reducing host reliance on microbiome-derived metabolites.

On a ketogenic diet, your gut bacteria produce fewer amino acids and vitamins because you are getting them directly from food. This suggests that the microbiome's role shifts based on dietary intake, and you may not need to rely on gut bacteria for these nutrients as much as on a vegan diet.

Reducing daily step counts from ~10,500 to ~1,344 for two weeks causes a 17% decline in skeletal muscle insulin sensitivity, a 7% decrease in cardiovascular fitness, and a 3% reduction in lean leg mass.

Do not assume that staying home for a short period is metabolically neutral. If you cannot maintain your usual activity levels, you must actively manage your energy intake and incorporate movement (even small bouts) to prevent rapid declines in insulin sensitivity and muscle mass.

Time-Restricted Eating (TRE) with an 8-hour daily eating window improves nocturnal and postprandial glycaemic control in men with overweight/obesity, independent of weight loss.

Try Time-Restricted Eating (TRE) by limiting your daily eating to an 8-hour window (e.g., 10 AM to 6 PM). This can improve your blood sugar control without needing to count calories or cut out specific foods. It is a practical strategy for maintaining metabolic health during isolation.

Tirzepatide's GIP receptor agonism directly enhances adipocyte glucose uptake and lipid clearance in the fed state by cooperating with insulin, contributing to reduced serum triglycerides without increasing adiposity.

Tirzepatide works partly by helping your fat cells clear sugar and fat from your blood more effectively when you eat, thanks to its GIP receptor activity. This helps lower blood fat levels without making you gain more body fat, complementing the weight loss driven by other mechanisms.

In the fasted state (low insulin), tirzepatide's GIP receptor agonism stimulates lipolysis (fat breakdown) to release stored energy, counter-regulating insulin's storage signal.

When you are not eating, tirzepatide helps your fat cells release stored fat for energy. This happens because the drug's GIP activity stimulates fat breakdown when insulin is low, ensuring your body can access energy stores during fasting periods.