Browse the evidence

Long sleep duration (≥ 9 hours) is associated with increased weight gain in men, potentially due to reduced energy expenditure from time in bed or underlying conditions like sleep apnea.

Sleeping 9 hours or more is also linked to weight gain in men, possibly because you are less active while in bed or because of undiagnosed sleep disorders like apnea. Aim for the 'Goldilocks' zone of 7-8 hours for optimal metabolic health.

Higher levels of neuroticism are generally associated with increased mortality risk, although some components (healthy neuroticism) may be protective.

While high neuroticism is often linked to shorter lifespan, some aspects like worry can motivate preventive health behaviors. Managing anxiety constructively, rather than suppressing it, may be beneficial for health.

Acute resistance exercise directly modulates circadian clock gene expression (Cry1, Per2, Bmal1) in human skeletal muscle, suggesting peripheral muscle clocks can respond independently of the central suprachiasmatic nucleus.

Performing resistance exercise can directly reset the internal biological clocks within your muscles. This happens at the gene level (specifically Cry1, Per2, and Bmal1) within 6 hours of a workout. This suggests that exercise is a potent tool for aligning your body's peripheral rhythms, potentially aiding sleep and metabolic health, even without changes to your central sleep-wake cycle.

Gut dysbiosis in obesity increases intestinal permeability, allowing lipopolysaccharide (LPS) to enter circulation, which triggers adipose tissue macrophages to switch from an anti-inflammatory (M2) to a pro-inflammatory (M1) phenotype via TLR4, thereby driving low-grade chronic inflammation.

If you have obesity, your gut health may be driving inflammation. A high-fat or high-sugar diet can damage your gut barrier, letting bacterial toxins (LPS) into your blood. This triggers immune cells in your fat tissue to become pro-inflammatory, worsening insulin resistance and fat storage. Improving gut health through fiber and reducing processed foods may help reduce this inflammation.

Short-chain fatty acids (SCFAs), particularly butyrate, exert anti-inflammatory effects by promoting macrophage polarization to the M2 phenotype and inhibiting NF-κB activation.

Eat more fiber-rich foods (vegetables, whole grains) to feed your gut bacteria. They produce short-chain fatty acids (SCFAs) like butyrate, which help calm inflammation by switching immune cells to a healing (M2) state. This is especially important if you have inflammatory conditions.

Chromium, DHEA, androstenedione, and protein supplementation do not significantly affect lean mass or strength gains during resistance training compared to placebo.

Do not rely on Chromium, DHEA, Androstenedione, or extra Protein supplements to boost muscle or strength gains from resistance training. They do not provide significant additional benefits.

Maternal employment in agriculture is associated with adverse child health outcomes, including higher risks of diarrhea, respiratory disease, and reduced healthcare seeking.

Programs supporting rural women in agriculture must address the time burden of farm work. Providing accessible childcare and healthcare services can help mitigate the negative health impacts on children when mothers are engaged in agricultural labor.

Relative price changes of staple foods (cereals vs. pulses/fruits) significantly influence dietary consumption patterns, with price increases in pulses predicting stagnant consumption.

Food policy should consider how subsidies and taxes affect the relative prices of nutritious foods like pulses and fruits. Making these foods more affordable relative to staples can drive positive changes in consumption patterns.

Individuals significantly underestimate their cardiovascular risk and their level of physical activity, demonstrating a disconnect between perceived and actual metrics.

Do not rely on your gut feeling to judge your health risk or activity level. You are likely underestimating your risk and overestimating your activity. Use objective tools like smartphone sensors or medical checkups to get a true picture of your cardiovascular health.

Anthocyanins from purple fruits and vegetables improve cognitive function and reduce beta-amyloid deposition in early-onset Alzheimer's disease models via PPARγ activation.

Incorporate anthocyanin-rich foods (blueberries, black currants, purple vegetables) into your daily diet. This may help improve verbal fluency and memory in elderly individuals with mild cognitive impairment.

Ketone bodies, specifically beta-hydroxybutyrate (BHB), have complex, potentially contradictory effects on appetite regulation by influencing AMPK phosphorylation and GABA levels, which may counteract hunger suppression.

Be aware that ketones might trigger some hunger signals via AMPK and GABA, but in practice, the hormonal suppression of ghrelin usually wins out, leading to net hunger reduction.

Loss-of-function mutations in the zinc transporter SLC30A8 (ZnT8) reduce the risk of type 2 diabetes in humans, likely by preventing the formation of toxic human islet amyloid polypeptide (hIAPP) oligomers through altered insulin oligomerization dynamics.

Do not assume zinc supplementation is a cure-all for diabetes. While deficiency is a risk factor, the paper suggests that genetic variations in zinc transport (ZnT8) significantly impact diabetes risk, and excessive zinc intake may actually worsen metabolic markers. Focus on overall nutrient balance rather than high-dose supplementation without medical guidance.

European children consume significantly higher proportions of total and added sugars relative to energy intake compared to adults, with sweet products and beverages being the primary sources.

If you are tracking sugar intake for health or weight management, pay close attention to children's diets. They are consuming a disproportionately high amount of sugar, primarily from sweets and sugary drinks, compared to adults. To reduce this, prioritize whole fruits over juices and limit confectionery and sweetened beverages, which are the main drivers of added sugar intake in this demographic.

Mandatory calorie menu labeling on quick-service restaurant menus does not significantly reduce the calories purchased or consumed by consumers in real-world or laboratory settings.

Posting calorie counts on fast-food menus does not reliably lead to healthier choices or lower calorie intake for the average consumer. Policymakers and consumers should not rely on labeling alone to combat obesity; other strategies like education or menu reformulation may be more effective.

Exercise alone, independent of fat mass loss, has little to no effect on serum leptin levels in humans, as leptin primarily reflects adipose tissue mass rather than acute energy expenditure.

Don't expect exercise to magically lower your hunger hormones immediately. Leptin levels drop primarily when you lose fat mass. Consistent exercise helps by reducing that mass over time, not by an acute hormonal effect of the activity itself.

Specific polyphenols found in fruits (e.g., resveratrol, pterostilbene, quercetin) prolong lifespan and control signs of aging by regulating inflammation, cell senescence, and oxidative damage.

Include fruits known for high polyphenol content, such as berries (blueberries, cranberries), grapes, and cherries, in your diet to potentially benefit from their anti-aging properties.

Losartan treatment restores skeletal muscle remodeling and reduces fibrosis in sarcopenic mice following injury by modulating canonical and noncanonical TGF-β signaling pathways.

This preclinical study suggests that Losartan, a common blood pressure medication, may help older adults recover better from muscle injuries by reducing scarring (fibrosis). While not a direct fitness intervention, it highlights a potential pharmacological strategy for managing sarcopenia-related muscle damage. Consult a physician before considering medication repurposing.

Losartan protects against disuse atrophy in sarcopenic mice during hindlimb immobilization by upregulating the IGF-1/Akt/mTOR pathway, independent of TGF-β signaling.

For older adults facing periods of immobility (e.g., recovery from surgery), this study suggests Losartan might help preserve muscle mass by boosting protein synthesis pathways. This is a preclinical finding; human application requires clinical validation. Discuss potential benefits with a doctor, especially regarding blood pressure management.

Intentional weight loss in healthy, overweight (non-obese) individuals is associated with a statistically significant increase in all-cause mortality risk compared to weight stability.

If you are overweight but otherwise healthy (no diabetes, heart disease, or high blood pressure), current evidence suggests you may actually increase your risk of early death by trying to lose weight. Instead of focusing on weight loss, prioritize maintaining your current weight, eating high-quality foods, and staying physically active. The goal should be health markers, not a lower number on the scale.

Unintentional weight loss is associated with a significant increase in all-cause mortality risk.

If you are losing weight without trying, consult a doctor. This is often a sign of an underlying health issue that needs to be addressed, rather than a fitness goal.

Chronic activation of AMPK using the direct activator A-769662 promotes white adipose tissue browning, increases energy expenditure, and protects against diet-induced obesity and metabolic dysfunction in high-fat diet-fed mice.

This study suggests that directly activating the AMPK enzyme in fat cells using a specific compound (A-769662) can help burn fat and prevent obesity in mice. While this is not a human supplement, it supports the idea that boosting cellular energy sensors (like AMPK) through exercise or diet might mimic these effects.

Higher county-level poverty rates are strongly associated with higher obesity rates, driven primarily by increased sedentariness rather than just food access.

If you live in an area with limited resources, focus on reducing sedentary time as much as possible, as lack of movement is a primary driver of obesity in these settings. Look for low-cost ways to increase non-exercise activity, as the barrier is often access to facilities rather than just food.

Poverty is associated with higher rates of diabetes, contributing significantly to healthcare costs, suggesting that addressing poverty could mitigate the 'diabesity' epidemic.

For policymakers, investing in poverty reduction and community infrastructure (parks, safe spaces) may be more cost-effective than treating diabetes complications, given the high per-patient cost ($9k/year).

Administration of chemical chaperones (4-PBA and TUDCA) reduces ER stress, thereby improving insulin sensitivity and reducing hepatic steatosis in obese, insulin-resistant models.

Chemical chaperones like 4-PBA and TUDCA show promise in animal studies for reducing liver fat and improving insulin sensitivity by lowering ER stress. However, they are currently used for other medical conditions and are not standard obesity treatments.