Browse the evidence

Higher early adult BMI (ages 18-30) is inversely associated with breast cancer risk in both pre- and postmenopausal women, suggesting a protective effect of higher adiposity during young adulthood.

Maintain a healthy weight during young adulthood (18-30), as higher early adult BMI may offer some protection against breast cancer later in life. However, avoid adult weight gain, which increases risk.

Regulatory T (Treg) cells exert an attenuating effect on insulin resistance and hepatic inflammation in NAFLD and obesity, primarily through the secretion of inhibitory cytokines IL-10 and TGF-beta and PPAR-gamma-dependent functionality.

In obesity and NAFLD, the body's natural regulatory T cells (Tregs) are often depleted or dysfunctional, contributing to insulin resistance and liver damage. Restoring Treg function (e.g., via PPAR-gamma agonists like pioglitazone in clinical settings) can improve glucose tolerance and reduce liver inflammation. Lifestyle interventions that reduce adipose tissue inflammation may help preserve Treg numbers.

Th17 cells promote liver inflammation, fibrosis, and insulin resistance in NAFLD and obesity, primarily through IL-17 secretion which stimulates pro-inflammatory cytokine release and hepatic stellate cell activation.

High levels of Th17 cells and IL-17 are associated with worse insulin resistance and liver fibrosis in obesity and NAFLD. Reducing systemic inflammation through weight loss and metabolic control may lower Th17 activity, thereby improving insulin sensitivity and slowing liver disease progression.

Long-acting Fc-fusion GDF15 molecules reduce body weight and improve metabolic profiles in obese models by delaying gastric emptying, altering food preference, and activating area postrema neurons.

This research suggests that engineered GDF15 therapies could effectively treat obesity by slowing digestion and changing food preferences via brain signaling. While currently in preclinical stages, the weekly dosing schedule of these long-acting variants offers a promising alternative to daily oral medications for metabolic disorders.

Loss of proteostasis, characterized by the accumulation of abnormal proteins due to decreased cellular capacity to degrade them, is a hallmark of aging and contributes to age-related pathologies like neurodegenerative diseases.

As we age, our cells become less efficient at cleaning up damaged proteins, leading to accumulation that can cause diseases like Alzheimer's. Maintaining cellular 'housekeeping' through healthy lifestyle choices (like exercise and diet) may help support these natural degradation pathways.

Insulin resistance (IR) fundamentally alters the association between specific lipid subclasses and clinical health markers, causing lipid profiles to diverge significantly from those seen in insulin-sensitive (IS) individuals.

If you have insulin resistance, standard lipid markers (like LDL/HDL ratios) may not predict your health risks the same way they do for healthy people. Your lipid profile's relationship with inflammation and blood sugar changes. Relying solely on standard lipid panels without assessing insulin sensitivity (e.g., fasting insulin, HOMA-IR, or SSPG) may miss critical metabolic risks.

During acute respiratory viral infections (RVIs), specific lipid subclasses (small TAGs, LPCs, ether-linked PEs) undergo dynamic, phase-dependent changes that correlate with immune response and energy metabolism shifts.

Your lipid profile is not static during illness. Small TAGs drop sharply early in infection (possibly for energy), while LPCs and ether-linked PEs drop later, correlating with inflammation. This suggests lipids play an active role in managing the immune response and energy demands of acute illness, rather than just being passive storage molecules.

Metabolic syndrome is associated with a systemic proinflammatory state and increased oxidative stress, characterized by elevated plasma levels of TNFα and IL-6, higher malondialdehyde (lipid peroxidation), and lower plasma superoxide dismutase (SOD) activity.

If you have metabolic syndrome, your body is in a state of chronic low-grade inflammation and oxidative stress. This isn't just 'bad luck'; it's a biological response to visceral fat and metabolic dysfunction. Recognizing this inflammatory state is the first step to understanding why managing weight, blood sugar, and blood pressure is critical for long-term health.

Patients with Metabolic Syndrome exhibit higher antioxidant enzyme activities (Catalase, Glutathione Reductase) and protein levels in Peripheral Blood Mononuclear Cells (PBMCs) compared to those without MetS, likely due to a pre-activated state of immune cells.

Your immune cells are working overtime to fight the oxidative stress caused by metabolic syndrome. This is why your body might have higher levels of certain protective enzymes in your white blood cells. It's a sign of your body trying to protect itself, but it also indicates that your immune system is chronically activated, which is a risk factor for long-term health issues.

Weight loss therapies, including bariatric surgery and hypocaloric diets, inevitably lead to skeletal muscle catabolism, particularly during rapid weight loss phases.

When you start a diet or surgery, expect some muscle loss. To protect your muscle, ensure you eat enough protein and engage in resistance training, as rapid weight loss makes muscle loss more likely.

SGLT2 inhibition (canagliflozin) reduces adiposity and activates lipolysis exclusively through FGF21-dependent mechanisms, while its effects on lipid oxidation, ketogenesis, and hepatic steatosis reduction are FGF21-independent.

SGLT2 inhibitors reduce body fat by triggering a hormonal signal (FGF21) that activates fat burning (lipolysis). This process is distinct from simple calorie restriction and requires the presence of FGF21 to effectively reduce fat mass.

SGLT2 inhibition induces a fasting-like metabolic state characterized by increased fatty acid oxidation, ketogenesis, and reduced hepatic steatosis independently of FGF21.

SGLT2 inhibitors shift the body's fuel source to fat and ketones, mimicking a fasting state. This metabolic switch occurs even if the hormonal pathway for fat loss (FGF21) is blocked.

Obese individuals exhibit altered glutamine metabolism, characterized by decreased serum glutamine and alpha-ketoglutarate, and increased succinate, which correlates with M1 macrophage accumulation.

Obesity is associated with lower levels of glutamine and alpha-ketoglutarate, and higher succinate. While this is a marker of disease, simply taking glutamine supplements may not fully reverse these changes in humans, as muscle mass and other factors also play a role. Focus on overall metabolic health.

Pro-inflammatory cytokines IL-1beta and TNF-alpha are somnogenic; their expression increases with waking activity and sleep deprivation, and they promote non-rapid-eye movement (NREM) sleep and slow-wave activity (SWA).

Prioritize sleep hygiene not just for rest, but to regulate inflammation. Chronic wakefulness or poor sleep increases pro-inflammatory cytokines like IL-1beta and TNF-alpha, which can disrupt sleep architecture and overall health. Managing inflammation through lifestyle may improve sleep, and good sleep helps manage inflammation.

The NLRP3 inflammasome is a critical mediator of sleep regulation; its activation leads to the production of IL-1beta and IL-18, which promote NREM sleep and slow-wave activity.

Understanding that sleep loss activates the NLRP3 inflammasome suggests that chronic sleep deprivation may fuel a cycle of inflammation. Breaking this cycle by improving sleep may reduce inflammasome activity.

Circadian rhythm disruption is associated with increased morbidity risk for inflammatory diseases, including cardiovascular disease, cancer, and metabolic disease.

Maintaining a regular sleep-wake cycle is crucial for long-term health, as disrupting your circadian rhythm increases the risk of inflammatory diseases like heart disease and cancer.

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.

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.

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.