Browse the evidence

Continued global nutrition transition toward high animal-source food and empty calorie consumption will result in 45% of the world population being overweight and 16% obese by 2050, driving a 50% increase in global food demand.

To avoid the projected 45% overweight rate by 2050, individuals and policymakers must prioritize reducing household food waste and shifting dietary composition away from animal-source foods and empty calories. This involves increasing consumption of vegetables, fruits, and nuts, and recognizing that current trends are unsustainable for both health and the environment.

Intrauterine exposure to excess fuels, particularly glucose, causes permanent fetal changes that lead to accelerated postnatal weight gain and increased risk of obesity in postnatal life.

Maintain healthy weight and blood sugar levels during pregnancy. Excessive weight gain and high glucose levels can program the baby's metabolism for obesity. Consult your doctor for a pregnancy diet plan that supports healthy fetal growth without excessive maternal weight gain.

A developmental mismatch between a sub-optimal pre-natal/infant environment (e.g., low birth weight, poor growth) and an obesogenic childhood environment predisposes individuals to obesity and related co-morbidities.

If your baby was born small, avoid overfeeding them in early childhood. Rapid catch-up growth can increase the risk of obesity and metabolic disease. Aim for steady, moderate growth and maintain a healthy lifestyle.

The anti-inflammatory effect of marine-derived n-3 PUFAs on CRP is significantly weakened or absent in subjects with a BMI greater than 30 kg/m2.

If you have a BMI over 30, fish oil supplements may not significantly lower your CRP levels. Focus on weight management first, as the anti-inflammatory benefit of omega-3s is much less effective in obese individuals.

Liraglutide treatment does not significantly alter 24-hour energy expenditure or substrate oxidation in patients with type 2 diabetes.

Taking liraglutide will not change how many calories you burn throughout the day. Your energy expenditure remains the same as if you were taking a placebo.

Mitochondrial dysfunction and ER stress are key mechanistic drivers of insulin resistance, primarily through the activation of inflammatory pathways and impaired insulin signaling.

Insulin resistance is driven by cellular stress in mitochondria and the ER, often caused by chronic overnutrition. Managing metabolic health involves reducing this cellular stress through balanced nutrition and activity, rather than just focusing on weight.

Fasting-induced elevation of the myokine FGF21 is required for starvation-mediated muscle atrophy and weakness; its absence preserves muscle mass and force during caloric restriction.

If you are fasting or in a caloric deficit, your body actively uses the hormone FGF21 to break down muscle. This paper suggests that blocking this specific hormonal signal could theoretically preserve muscle mass even without food. While this is a mouse study, it highlights that muscle loss isn't just 'inevitable' during fasting but is driven by specific biological switches.

FGF21 promotes muscle atrophy by increasing mitophagy flux via the protein Bnip3, rather than through the ubiquitin-proteasome system (UPS).

This paper identifies Bnip3 and mitophagy (mitochondrial recycling) as the specific cellular mechanism FGF21 uses to break down muscle during starvation. Blocking this specific pathway, rather than just general protein breakdown, might be key to preserving muscle during stress.

High levels of daily physical activity in hunter-gatherer populations do not result in higher total energy expenditure (TEE) compared to industrialized populations, as the body compensates by reducing non-exercise activity thermogenesis (NEAT) and resting metabolic rate (RMR).

Do not rely on exercise alone to create a massive caloric deficit, as your body may compensate by lowering its resting metabolic rate. Focus on dietary quality and portion control, as high activity levels alone may not increase total energy expenditure significantly enough to drive weight loss if diet is not managed.

Hunter-gatherer diets are not invariably low-carbohydrate; many populations consume diets rich in carbohydrates and simple sugars (e.g., from honey and tubers) while maintaining excellent metabolic health.

You do not need to avoid carbohydrates to be healthy. Many traditional populations thrive on high-carbohydrate diets rich in fiber and micronutrients (from tubers, fruits, and honey). Focus on the quality and source of carbohydrates rather than eliminating them.

The menopausal transition in nonobese women causes significant increases in visceral fat and total fat mass without resulting in cardiometabolic deterioration.

If you are a healthy, nonobese woman going through menopause, expect your body fat, especially around your organs (visceral fat), to increase. However, this physical change does not automatically mean your blood sugar, cholesterol, or blood pressure will get worse. Maintaining cardiorespiratory fitness and a healthy weight can help prevent these metabolic risks despite the hormonal shifts.

Human skeletal muscle contains two distinct muscle stem cell (MuSC) subpopulations: a 'quiescent' population (MuSC1) characterized by high PAX7 and EGFR expression, and an 'early-activated' population (MuSC2) characterized by inflammatory markers (TNFRSF12/FN14, CCL2) and signs of dysfunction associated with aging and wasting diseases.

This research highlights that muscle stem cells are not all the same. In healthy, young muscle, most stem cells are 'quiescent' (resting) and express EGFR, which is crucial for proper repair. However, in aging or disease states, a subset of stem cells becomes 'early-activated' and expresses inflammatory markers (like TNFRSF12/FN14) associated with muscle wasting. For fitness, this implies that maintaining muscle health through resistance training may help preserve the healthy, quiescent pool and prevent the shift toward this dysfunctional, inflammatory state seen in aging.

Oral zinc supplementation may decrease the absorption of certain drugs, including ciprofloxacin, doxycycline, and risedronate.

If you take ciprofloxacin, doxycycline, or risedronate, separate your zinc supplementation from these medications by a few hours to ensure proper drug absorption.

GIP receptor (GIPR) antagonism prevents diet-induced obesity and reduces fat mass in mice and non-human primates, independent of pancreatic beta-cell GIPR activity.

Blocking the GIP receptor appears to be a powerful strategy for weight loss in preclinical models, working by reducing food intake and increasing fat burning (lipid oxidation). This effect is independent of how the pancreas handles insulin, suggesting a direct metabolic benefit. When combined with existing GLP-1 drugs (like semaglutide or liraglutide), weight loss is significantly enhanced, suggesting these mechanisms can be stacked for greater efficacy.

GIPR antagonism reduces the Respiratory Exchange Ratio (RER) during rest, indicating increased lipid oxidation as a mechanism for weight loss.

Blocking GIP receptors may help your body burn more fat for fuel while at rest, even without changing your activity level. This metabolic shift contributes to the overall weight loss observed.

Both short sleep duration (<=5-6 hours) and long sleep duration (>=8-9 hours) are independent predictors of incident stroke.

Aim for 7-8 hours of sleep per night. Consistently sleeping much less than 6 hours or much more than 9 hours is associated with a higher risk of stroke. If you find yourself needing excessive sleep or struggling to sleep, consult a doctor to rule out underlying issues like apnea or depression.

Variations in soft tissue hydration introduce systematic, predictable errors in Dual-Energy X-ray Absorptiometry (DXA) fat estimates, with the magnitude of error depending on the elemental composition of the excess fluid and the degree of overhydration.

If you are using DXA to track body fat changes, ensure your hydration status is stable between scans. Significant fluid shifts (like severe edema or dehydration) can skew results, making you appear leaner or fatter than you are. For healthy individuals with normal hydration, the error is likely negligible (<1%), but for those with fluid retention issues, DXA fat estimates may be inaccurate.

Aging involves synchronized, tissue-specific gene expression changes, with vital organs like heart, lung, and blood showing strong 'co-aging' synchronization, while mitochondrial dysfunction is a central, conserved biological process across multiple tissues.

Aging is not a single event but a collection of tissue-specific molecular changes. While mitochondrial health is a common thread, the rate and nature of aging vary by organ. This suggests that interventions targeting specific tissues (e.g., cardiovascular health) may need to be tailored, as 'one size fits all' anti-aging strategies may not address tissue-specific vulnerabilities.

Obesity is metabolically heterogeneous, distinguished by metabolically unhealthy obese (MUHO) phenotypes exhibiting insulin resistance, inflammation, and altered metabolite profiles, versus metabolically healthy obese (MHO) phenotypes.

Do not assume that a high BMI automatically implies poor metabolic health or high disease risk. Metabolically Healthy Obesity (MHO) exists, but Metabolically Unhealthy Obesity (MUHO) carries specific risks like insulin resistance and inflammation. To understand your actual health risk, metabolic markers (like blood sugar, lipids, and inflammation) must be tested, as BMI alone is insufficient.

Sleep irregularity is associated with increased perceived stress and depressive symptoms, which may serve as additional mechanisms linking irregular sleep to cardiometabolic disease.

Recognize that mental health and sleep consistency are linked. If you are experiencing high stress or depressive symptoms, improving your sleep regularity (consistent bed/wake times) may help alleviate these symptoms and reduce your long-term risk of cardiovascular disease.

Tirzepatide improves systemic insulin sensitivity in obese mice through a weight-independent mechanism mediated by GIP receptor (GIPR) agonism, which enhances glucose disposal in white adipose tissue and upregulates BCAA catabolism in brown adipose tissue.

Tirzepatide improves how your body handles sugar through two paths: losing weight and directly activating receptors in your fat tissue to burn glucose and amino acids more efficiently. This dual action means it can improve blood sugar control even if weight loss is modest.

Activation of beta-adrenergic receptors (betaARs) by catecholamines triggers lipolysis and energy expenditure in adipocytes through complex signaling networks involving PKA, ERK, and p38 MAPK, with beta3AR playing a distinct role in recruiting brown adipocyte-like features in white fat depots.

Your body naturally burns stored fat using adrenaline and noradrenaline, which activate specific receptors on fat cells. This process involves complex internal signaling. While drugs targeting these receptors have failed in humans, you can naturally stimulate these pathways through activities that increase catecholamines, such as exercise or cold exposure, which may help recruit brown-like fat features in white fat depots.

Adding complex goal-setting (Achieve) and nutrition (Nourish) modules to a basic weight loss program significantly reduces user engagement and retention compared to the basic program alone.

Keep digital weight loss programs simple. Adding too many modules or complex goal-setting features can overwhelm users and reduce engagement. A basic, focused program often yields better adherence than a complex, multi-module one.

Males, smokers, and individuals with higher estimated medical costs (RxRisk) are less likely to enroll in internet-based weight loss programs than females, nonsmokers, and lower-risk individuals.

To reach high-risk populations (smokers, males, those with chronic illness), use targeted, personalized outreach from trusted sources. General marketing may not reach these groups effectively.