Browse the evidence

Vigorous or moderate exercise significantly reduces the risk of sleep disturbance in individuals with severe sedentary behavior, although this benefit is not mediated by the measured blood-cell-based inflammatory biomarkers.

If you sit for more than 8 hours a day, doing 150 minutes of moderate or 75 minutes of vigorous exercise per week significantly lowers your risk of sleep problems. However, this benefit is specific to those with high sitting times; for those who are already active, the added benefit on sleep risk was not statistically significant in this study.

Females and males experience similar relative increases in muscle hypertrophy and lower-body strength when following the same resistance training protocol, but females exhibit a significantly larger relative increase in upper-body strength.

If you are a female starting resistance training, do not expect your absolute strength numbers to match males, but expect your relative improvements in upper-body strength to be greater than males. For muscle size and lower-body strength, your relative progress will be on par with males. Stick to the same training protocols used by males; you do not need a different program to see excellent results.

Objective actigraphy reveals significantly lower physical activity and dampened circadian rhythms in individuals with current depressive or anxiety disorders compared to controls, whereas self-reported measures fail to capture these objective differences.

For individuals with depression or anxiety, relying on memory or self-reports of activity and sleep is often inaccurate. Objective monitoring via actigraphy reveals that these individuals are significantly less active and have more disrupted circadian rhythms than healthy controls. This objective data is crucial for accurate assessment and monitoring treatment response, as self-reports may miss these critical disturbances.

Hunter-gatherer populations exhibit very low prevalence of obesity and metabolic diseases (such as type 2 diabetes and hypertension) despite high physical activity levels, suggesting that lifestyle factors beyond simple energy balance (e.g., diet composition, pathogen load) are critical for metabolic health.

Adopting a lifestyle with high physical activity and whole-food diets can significantly reduce the risk of obesity, diabetes, and hypertension, even into old age. Focus on maintaining muscle mass and activity levels rather than fearing these diseases as inevitable.

In postmenopausal women with a normal body mass index (BMI 18.5–24.9), higher levels of body fat (specifically whole-body and trunk fat) are associated with a significantly elevated risk of invasive breast cancer, particularly estrogen receptor-positive (ER+) subtypes.

If you are a postmenopausal woman with a normal BMI, your body fat percentage still matters for breast cancer risk. High body fat, especially around the trunk, is linked to a significantly higher risk of ER-positive breast cancer, even if your weight is healthy. Focus on maintaining healthy body fat levels through diet and exercise, rather than just focusing on BMI.

Lifestyle modification and metformin treatment can modulate gut microbiota and maintain glucose homeostasis in type 2 diabetes, suggesting similar potential for post-GDM women.

For post-GDM women, lifestyle changes and metformin have been shown to help manage blood sugar and potentially improve gut bacteria. However, adherence to lifestyle changes is often poor after delivery, and metformin's use as a preventive strategy is still debated. Prioritize sustainable lifestyle habits.

Zinc is an essential micronutrient required for over 300 enzymes and 1000 transcription factors, playing critical roles in protein synthesis, DNA synthesis, immune function, and insulin stability.

Ensure adequate dietary zinc intake, prioritizing animal sources like oysters, meat, and dairy for better bioavailability. If you have conditions affecting absorption (like malabsorption syndromes) or are in a high-risk demographic (pregnant women, elderly), consider monitoring levels or supplementing, as zinc is critical for immune function and enzyme activity.

Excessive zinc intake inhibits the absorption of copper and iron, potentially leading to copper deficiency and anaemia, respectively.

If you are supplementing with zinc, be aware that high doses can block copper and iron absorption. Monitor your levels and consider balancing your intake or spacing out supplements if taking high doses long-term.

Randomized trials in children aged six months to twelve years showed that zinc supplementation reduces all-cause and infectious disease mortality and has a minor positive impact on linear growth.

For children in high-risk or deficient regions, zinc supplementation is a critical intervention to reduce mortality and support growth.

Semaglutide (1.0 mg once-weekly) significantly improves fasting and postprandial glucose and lipid metabolism in subjects with obesity, primarily through delayed first-hour gastric emptying and GLP-1 receptor agonism.

For individuals with obesity, semaglutide (1.0 mg weekly) significantly improves how the body handles glucose and fats after eating. This is achieved by slowing down the initial emptying of the stomach, which prevents rapid spikes in blood sugar and lipids. This benefit occurs even in people without diabetes, suggesting it may be a valuable tool for metabolic health in obesity.

Elevated levels of branched-chain amino acids (BCAAs) and aromatic amino acids, along with altered lipid profiles (e.g., elevated palmitic acid), serve as consistent metabolomic signatures of obesity and insulin resistance.

If you have obesity, check your metabolic markers, specifically amino acids and fatty acids. Elevated BCAAs and certain fatty acids like palmitic acid are linked to insulin resistance. Monitoring these can help identify metabolic dysfunction early, even if your weight is stable.

Weight loss interventions, including hypocaloric diets and exercise, modulate the metabolomic profile of obese individuals, potentially reversing or altering obesity-related metabolic signatures.

Weight loss through diet or exercise changes your metabolic profile. This means that losing weight can help reverse some of the metabolic abnormalities associated with obesity, such as insulin resistance and altered amino acid levels.

Sleep irregularity, measured by the Sleep Regularity Index (SRI), is significantly associated with increased cardiometabolic risk, including higher 10-year atherosclerotic cardiovascular disease (ASCVD) risk, obesity, hypertension, and markers of type 2 diabetes (fasting glucose, HbA1c), independent of sleep duration.

Track your sleep consistency, not just duration. Use a wearable or app to calculate your Sleep Regularity Index (SRI) or simply aim to go to bed and wake up at the same time every day, including weekends. This consistency is linked to lower risks of heart disease, diabetes, and obesity, independent of how many hours you sleep.

Magnesium supplementation corrects hypomagnesemia and improves glycemic control, blood pressure, and triglyceride levels in patients with metabolic syndrome or type 2 diabetes, but has no effect on normomagnesemic individuals.

If you have metabolic syndrome or type 2 diabetes, get your magnesium levels checked. If you are deficient, supplementing with 250-600mg of elemental magnesium daily for at least 3 months can significantly improve your blood sugar, blood pressure, and triglycerides. If your levels are normal, supplementation likely won't help.

Magnesium deficiency contributes to insulin resistance and type 2 diabetes through impaired insulin signaling, specifically by altering the PI3K/Akt pathway and KATP channel regulation in pancreatic beta cells.

Maintaining adequate magnesium levels is crucial for proper insulin function. Low magnesium disrupts the cellular machinery that allows insulin to work, contributing to the development of type 2 diabetes.

Phase-sensitive 8-electrode segmental bioelectrical impedance analysis (BIA) provides high-accuracy predictions of whole-body and segmental skeletal muscle mass (SMM) comparable to MRI, with no significant difference in goodness-of-fit between standing and supine measurement positions.

For accurate tracking of muscle mass without expensive MRI scans, use a medical-grade, phase-sensitive, 8-electrode segmental BIA device. Ensure you follow the manufacturer's protocol for either standing or supine measurement, as both are equally accurate with this technology. Do not rely on simple wrist-ankle consumer scales for precise muscle mass estimation, as they are less accurate.

Higher adherence to a plant-based dietary index (high plant foods, low animal foods) is associated with lower longitudinal insulin resistance, lower risk of prediabetes, and lower risk of type 2 diabetes.

Adopt a diet that emphasizes plant foods (vegetables, fruits, whole grains, nuts, legumes) and reduces animal foods (meat, dairy, eggs). You do not need to be strictly vegan. Increasing your plant-based score by 10 units (e.g., more fruits/vegetables, less red meat) is associated with a 13-18% lower risk of developing type 2 diabetes and lower insulin resistance. Ensure your plant foods are high quality (whole grains, not sweets).

Caffeine consumption (particularly >200 mg) disrupts sleep quality and quantity by reducing melatonin metabolites and shifting sleep architecture, leading to next-day performance deficits.

If you consume caffeine, be aware that it can disrupt your sleep even if you stop 6 hours before bed. This disruption leads to next-day performance deficits. To mitigate this, limit caffeine intake to early morning hours or reduce total daily dosage, especially if you are sensitive to sleep loss.

Caffeine administration after sleep deprivation caused by prior caffeine use can reverse performance deficits, often resulting in a net benefit for psychomotor and cognitive tasks, though this may be partly due to the reversal of withdrawal symptoms.

Caffeine can effectively counteract the performance deficits caused by sleep deprivation, particularly for vigilance and reaction time tasks. However, it may not improve complex motor skills like marksmanship. Use caffeine strategically to maintain performance during sleep-deprived periods, but recognize that it does not replace the need for sleep.

Activation of PPARα by fibrate agonists (e.g., fenofibrate, ciprofibrate) reduces plasma triglycerides and LDL-C while increasing HDL-C, primarily by accelerating fatty acid oxidation and ketone body production in the liver.

Fibrates are a class of drugs that activate PPARα to lower bad cholesterol (LDL) and triglycerides while raising good cholesterol (HDL). They work by telling your liver to burn more fat for energy. While diet plays a role in activating these receptors, fibrates provide a potent, targeted activation for those with high lipid levels.

Healthcare workers (nurses and physicians) treating COVID-19 patients exhibit significantly elevated prevalence of sleep disturbances (34.8% for nurses, 41.6% for physicians) driven by workplace stress, anxiety, and exposure to the virus.

If you are a healthcare worker treating infectious disease patients, your risk of sleep disturbance is high (approx. 35-42%). This is driven by stress and anxiety, not just workload. Prioritize stress-reduction interventions and sleep hygiene protocols to protect your health and patient safety.

Sarcopenic obesity (SO) creates a synergistic, vicious cycle with diabetes where insulin resistance accelerates muscle catabolism and loss of muscle mass worsens insulin sensitivity, leading to significantly higher all-cause mortality and metabolic disorder risks than either condition alone.

If you have excess body fat and low muscle mass/strength, standard weight loss advice may be harmful. Focus on preserving muscle through adequate protein (1-1.2 g/kg/day for older adults) and resistance training, rather than just caloric restriction. This combination is critical to breaking the cycle of insulin resistance and reducing mortality risk.

Low-grade inflammation driven by adipose tissue expansion (secreting TNF-a, IL-6, leptin) directly contributes to insulin resistance and muscle protein catabolism, accelerating the progression of sarcopenic obesity.

Managing inflammation through lifestyle (diet, activity) is part of treating SO, as fat tissue actively secretes hormones that break down muscle and block insulin.

The A Body Shape Index (ABSI) provides superior mortality risk stratification compared to BMI and other waist indices (WC, WHR) because it is designed to be independent of BMI, allowing for the identification of high-risk individuals within all BMI categories, including underweight and obese groups.

Use the A Body Shape Index (ABSI) instead of just BMI or waist circumference to assess your mortality risk. ABSI accounts for your waist size relative to your height and weight in a way that BMI cannot. If you have a high ABSI, you are at higher risk of death regardless of whether you are underweight, normal weight, or obese. This metric helps identify people who might be missed by BMI alone, allowing for more personalized screening and monitoring.