Browse the evidence

Regular physical activity improves cortisol and dehydroepiandrosterone (sulphate) levels in older adults, contributing to healthy ageing.

Engage in regular physical activity, such as moderate-intensity exercise, to help regulate stress hormones like cortisol and DHEA(S), which supports healthy ageing and reduces frailty risk in older adults.

Daily supplementation with 2000 IU of Vitamin D3 reduces the incidence of advanced (metastatic or fatal) cancer in adults without prior cancer diagnosis, with the effect being statistically significant only in individuals with a normal body mass index (BMI < 25).

If you are maintaining a healthy weight (BMI < 25), taking 2000 IU of Vitamin D3 daily may help reduce your risk of developing advanced or fatal cancer. However, if you are overweight or obese, this specific dose may not provide the same protective benefit against advanced cancer, likely due to how fat stores sequester the vitamin. Consult your doctor before starting, especially if you have existing health conditions.

Obesity accelerates biological aging across multiple physiological systems, including telomere shortening, epigenetic drift, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, deregulated nutrient sensing, and chronic inflammation, thereby reducing healthspan and lifespan.

Maintaining a healthy body weight is not just about preventing specific diseases like diabetes or heart disease; it is a critical factor in slowing down the biological aging process itself. By avoiding obesity, you protect your telomeres, epigenetic markers, and cellular health, potentially extending your healthspan.

Caloric restriction (CR) mitigates obesity-induced aging mechanisms by restoring mitochondrial function, promoting stem cell self-renewal, and modulating epigenetic aging clocks.

If you are obese, even modest caloric restriction can help reverse some of the biological aging markers associated with excess weight, such as epigenetic drift and mitochondrial dysfunction.

Time-restricted feeding (TRF) restricted to an early window (e.g., 6 hours ending before 3 PM) improves metabolic health markers (insulin sensitivity, blood pressure, oxidative stress) in humans independent of weight loss, whereas late TRF or unrestricted late eating worsens glucose tolerance and metabolic profiles.

If you are prediabetic or overweight, try restricting your eating window to 6-8 hours, ensuring your last meal is finished by 3 PM. This specific timing improves insulin sensitivity and blood pressure without requiring weight loss. Avoid eating late in the evening (after 4 PM), as this worsens glucose tolerance regardless of total calories. If you cannot eat early, focus on reducing late-night snacking and aligning meals closer to your natural melatonin onset.

Circadian misalignment, such as that caused by shift work, jet lag, or forced late eating, induces metabolic dysfunction including insulin resistance, increased blood pressure, and altered glucose tolerance, even in healthy lean individuals.

Avoid eating close to bedtime or during your biological night. If you work shifts or travel across time zones, prioritize aligning your meals with your local daylight hours as much as possible. Even short-term misalignment can rapidly impair glucose tolerance, so consistency in timing is as important as content.

Male obesity causes male subfertility through hormonal imbalance (hypogonadism), chronic inflammation, oxidative stress, and increased scrotal temperature, leading to reduced sperm quality and DNA damage.

If you are overweight or obese, your fertility may be compromised due to hormonal changes, inflammation, and heat stress on the testes. Losing weight through lifestyle changes or surgery can improve testosterone levels and sperm count, suggesting that weight management is a critical step for men trying to conceive.

Performing 60 minutes of moderate-intensity treadmill exercise induces significant circadian phase shifts in humans, with large phase delays occurring when exercise is performed between 7:00 pm and 10:00 pm, and large phase advances occurring when exercise is performed at 7:00 am or between 1:00 pm and 4:00 pm.

If you need to adjust your sleep schedule, time your 60-minute moderate exercise (where you can talk but not sing) strategically. To fall asleep earlier (phase advance), exercise between 7:00 am and 4:00 pm. To stay up later (phase delay), exercise between 7:00 pm and 10:00 pm. Avoid exercising around 4:00 pm or 2:00 am if you want to minimize shifts, as these times produce minimal effects.

Low dietary fiber intake leads to a reduction in gut microbiota diversity and promotes the degradation of host mucus, increasing susceptibility to inflammation and colitis.

Ensure adequate intake of diverse dietary fibers from whole plant sources to prevent the gut microbiota from degrading your intestinal mucus barrier, which protects against inflammation and disease.

A low-calorie lacto-ovo vegetarian diet is more effective than a Mediterranean diet at reducing LDL cholesterol, while the Mediterranean diet is more effective at reducing triglycerides.

If your primary concern is high LDL cholesterol, a vegetarian diet (including eggs/dairy) may lower it more than a Mediterranean diet. However, if you struggle with high triglycerides, a Mediterranean diet may be more effective. Both diets improve overall cardiovascular risk.

Skipping 30-minute relief breaks during work shifts significantly increases insomnia, acute and chronic fatigue, and post-traumatic stress symptoms among hospital nursing staff.

If you are a healthcare worker, prioritize taking your full 30-minute break during your shift. The data shows that skipping these breaks directly correlates with worse sleep, higher fatigue, and increased stress. Treat this break as a non-negotiable part of your job safety protocol, not an optional extra.

Exercise-induced PGC1α expression activates branched-chain amino acid (BCAA) metabolism, using BCAAs as an energy source in the TCA cycle, and increases the production of the myokine BAIBA.

During prolonged exercise, your muscles use BCAAs for energy. This process triggers the release of BAIBA, a molecule that helps improve metabolism in fat tissue and other organs. This highlights the systemic benefits of exercise beyond just muscle contraction.

Type 2 diabetes mellitus (T2DM) acts as an independent pathogenic factor for osteoarthritis (OA) progression and arthroplasty complications through mechanisms of oxidative stress, advanced glycation end-products (AGEs), and insulin resistance, separate from mechanical load.

If you have Type 2 Diabetes and joint pain, treating the diabetes is part of treating the arthritis. High blood sugar and insulin resistance actively damage joint tissue through inflammation and stiffness (AGEs), independent of how much you weigh. Optimize glucose control to potentially slow joint degradation.

Dual-energy X-ray absorptiometry (DXA) is the recommended clinical technique for assessing body composition (lean and fat mass) because it offers accuracy comparable to CT/MRI with significantly lower radiation exposure and cost.

Use DXA for accurate body composition tracking. It is safer and more accessible than CT/MRI for clinical purposes. Ensure standardized conditions (fasting, no exercise prior) for accurate results.

Fat Mass Index (FMI) and Android/Gynoid (AG) ratio provide superior obesity and cardiovascular risk assessment compared to BMI and waist-to-hip ratio by directly measuring adiposity and regional distribution.

Use DXA to get your Fat Mass Index (FMI) and Android/Gynoid (AG) ratio. These are better predictors of cardiovascular risk and metabolic health than BMI or waist circumference alone. An AG ratio >1 indicates higher visceral fat risk.

Hyperinsulinemia promotes obesity by inhibiting lipolysis and promoting lipogenesis at insulin concentrations lower than those required to inhibit gluconeogenesis.

Focus on keeping your fasting insulin low to prevent fat gain. Even modest increases in insulin (e.g., from doubling your baseline) can shut down fat burning (lipolysis) and start fat storage (lipogenesis) before your blood sugar regulation is even affected. This suggests that frequent snacking or high-carb meals, which keep insulin elevated, are more likely to cause weight gain than occasional high-sugar meals that spike glucose but clear quickly.

Testosterone administration increases muscle power and function, but its use is limited by potential side effects, particularly cardiovascular events and prostate malignancy risk, which vary by administration route.

Testosterone can improve muscle power and function, but it is not a first-line treatment due to potential side effects. If considered, the route of administration matters: oral testosterone may carry higher cardiovascular risks compared to transdermal or injection methods. Consult a physician to weigh benefits against risks.

Urinary metabolic profiling using 1H-NMR spectroscopy can objectively classify dietary patterns into low or high non-communicable disease risk categories, providing a more accurate assessment than self-reported dietary data.

Instead of relying solely on food diaries or memory of what you ate, objective metabolic profiling of urine can accurately determine your dietary pattern and associated health risks. This method bypasses the common errors of self-reporting, such as forgetting snacks or misjudging portion sizes, offering a more reliable way to assess adherence to healthy eating guidelines.

Pre-intervention gut microbiota composition determines the efficacy of inulin supplementation for reducing BMI and adiposity in obese patients; specifically, higher baseline levels of Akkermansia and Butyricicoccus predict a positive response (BMI decrease), while higher baseline Anaerostipes predicts a non-response.

If you are obese and considering inulin supplementation, your current gut bacteria determine if it will help you lose weight. Specifically, having high levels of Akkermansia and Butyricicoccus and low Anaerostipes at the start predicts success. Without this profile, you may not see BMI benefits despite taking the supplement. This suggests microbiota testing could be valuable before starting such interventions.

Inulin supplementation reduces hepatic steatosis and adiposity in obese individuals only when specific bacterial genera (Barnesiella, Bilophila, Butyricimonas, Victivallis) are decreased and others (Clostridium XIVa, Raoultella, Blautia, Akkermansia) are increased.

This finding explains WHY some people lose fat on inulin and others don't. It's not just about taking the powder; it's about whether your gut bacteria can utilize it to produce beneficial metabolic changes. If your bacteria don't shift in the right way (e.g., increasing Akkermansia), you won't get the liver fat benefits.

Plant-based milk substitutes lack key micronutrients found in animal milk (such as high-quality protein, calcium, and vitamins A, D, E, and B12) and require specific fortification strategies to match the nutritional profile of cow's milk.

If you switch to plant-based milk, check the label. Most unfortified versions lack the calcium, vitamin D, and protein of cow's milk. Choose products that are explicitly fortified to match these levels to maintain your nutritional intake.

Small increases in skin temperature (0.4°C within the 31-35°C range) can shorten sleep latency and promote deeper sleep without altering core body temperature.

You do not need to significantly heat your room or body to fall asleep faster. A subtle warming of your skin (via bedding) by just 0.4°C is sufficient to shorten sleep latency. This is particularly useful for elderly individuals or insomniacs who may have deficits in normal thermoregulation.

Sarcopenic obesity, defined as the coexistence of low muscle mass/strength and high adiposity, significantly increases the risk of all-cause mortality, cardiovascular disease, and frailty compared to having either condition alone.

If you are older or have obesity, do not rely on BMI alone. Muscle loss combined with fat gain is a specific, high-risk condition that increases mortality and heart disease risk. Focus on maintaining muscle mass through resistance exercise and adequate protein intake, rather than just weight loss, which can worsen muscle loss if not managed carefully.

Sarcopenic obesity drives cardiovascular disease and mortality through mechanisms of chronic low-grade inflammation, insulin resistance, and lipotoxicity, creating a vicious cycle with cardiovascular conditions.

Understanding that fat and muscle loss interact to cause inflammation and heart risk highlights why treating both is crucial. Managing inflammation and insulin sensitivity through lifestyle can break this cycle.