Browse the evidence

Adherence to an unhealthful plant-based diet (high in refined grains, sugary drinks, sweets, and animal products) is associated with a higher risk of all-cause mortality, cardiovascular disease, and cancer.

Avoid relying on processed plant-based foods, sugary drinks, and sweets. Focus on whole plant foods like whole grains, fruits, vegetables, nuts, and legumes to lower your risk of death, heart disease, and cancer.

Plasma levels of short-chain fatty acids (SCFAs), specifically acetate, are associated with lower cardiovascular disease (CVD) metabolic risk scores, whereas stool levels are not.

For cardiovascular health, the amount of short-chain fatty acids (like acetate) in your blood matters more than what's in your stool. Eating fiber-rich foods (fruits, vegetables, nuts) boosts these beneficial blood levels, which are linked to lower CVD risk. Focus on dietary patterns that support this absorption.

Nonalcoholic fatty liver disease (NAFLD) is strongly associated with metabolic syndrome, with prevalence rates of obesity (51%), type 2 diabetes (23%), and dyslipidemia (69%) significantly higher in NAFLD patients compared to the general population.

If you have fatty liver, check your metabolic health. High rates of obesity, diabetes, and high cholesterol are common companions. Managing these metabolic factors is crucial for liver health.

Bariatric surgery (Roux-en-Y gastric bypass and sleeve gastrectomy) significantly increases HDL-C levels and improves HDL functionality (cholesterol efflux capacity and apoA-I exchange rate) in obese patients, particularly with sustained effects observed at 12 months post-surgery.

If you have severe obesity and are considering bariatric surgery, know that it is the most effective way to significantly boost your HDL cholesterol levels and improve how well your HDL functions (specifically its ability to remove cholesterol). Studies show that Roux-en-Y gastric bypass and sleeve gastrectomy can increase HDL-C by 30-32% over five years, far outperforming medical therapy alone. However, full functional benefits, such as improved cholesterol efflux, may take up to 12 months to manifest, so patience and adherence to post-surgical care are crucial.

Integrating accelerometer, autonomic nervous system (ANS) signals (heart rate/HRV), and circadian modeling into wearable algorithms significantly improves sleep stage classification accuracy compared to accelerometer-only models.

To get the most accurate sleep data from a wearable ring, ensure it is worn correctly on the finger. The device uses movement, heart rate variability, and body temperature to distinguish between sleep stages. This multi-sensor approach is significantly more accurate than using movement alone, providing reliable data on light, deep, and REM sleep that can be used to guide sleep hygiene and recovery strategies.

Adults in South Asia exhibit a high prevalence (pooled 68%) of vitamin D deficiency, defined as serum levels < 20 ng/mL, with significant heterogeneity across countries and higher rates in females compared to males.

If you are an adult living in South Asia, there is a high likelihood (approx. 68%) that your vitamin D levels are below the recommended threshold of 20 ng/mL. This risk is higher for women due to cultural clothing and lifestyle factors. You should consider getting your serum vitamin D tested and discuss supplementation with a healthcare provider, as dietary sources alone are often insufficient to correct this widespread deficiency.

Physical function and anthropometric measurements (e.g., walking speed, grip strength) are practical phenotypic biomarkers that can perform better than DNA methylation in predicting health status.

Simple physical tests like walking speed and grip strength are highly effective, practical biomarkers for assessing your health status, sometimes outperforming complex DNA methylation tests.

The Sleep Regularity Index (SRI) and Interdaily Stability (IS) are sensitive to sleep fragmentation (awakenings) and napping, whereas Standard Deviation (StDev) and Composite Phase Deviation (CPD) are not sensitive to these factors.

If you want to assess sleep irregularity caused by waking up during the night or taking naps, use the Sleep Regularity Index (SRI) or Interdaily Stability (IS). Do not use Standard Deviation (StDev) or Composite Phase Deviation (CPD), as these metrics will ignore fragmentation and napping, giving you a false sense of regularity.

Social Jet Lag (SJL) measures weekly differences in sleep timing (workdays vs. free days) and is insensitive to day-to-day variability.

Use Social Jet Lag (SJL) only if you want to measure the difference between your workday and weekend sleep schedules. Do not use SJL to assess day-to-day consistency, as it will not detect daily fluctuations in sleep timing or duration.

Acetyl-L-carnitine (ALC) supplementation improves symptoms of diabetic neuropathy, including pain and nerve conduction, by enhancing neuronal energy metabolism and promoting nerve fiber regeneration.

If you have diabetic neuropathy, Acetyl-L-carnitine (ALC) may help reduce nerve pain and improve nerve function. It works by supporting the energy needs of nerve cells and promoting regeneration. It is generally well-tolerated.

High cardiovascular fitness in midlife is associated with an 88% reduced risk of all-cause dementia and a delayed dementia onset by 9.5 years compared to medium fitness.

Focus on building cardiovascular fitness (aerobic capacity) during midlife (ages 40-60). This study suggests that high fitness levels measured objectively (e.g., via cycling tests) are strongly associated with a significantly lower risk of developing dementia later in life and a delayed onset of symptoms. While this study is observational and not causal, it supports prioritizing cardiovascular health in midlife as a potential strategy for long-term brain health.

Lifestyle factors including regular physical activity, healthy diet (rich in vitamins/antioxidants), lower BMI, and no smoking are associated with longer telomeres and slower telomere shortening.

You can slow down cellular aging by adopting a healthy lifestyle. This includes eating a diet rich in fruits and vegetables, exercising regularly, maintaining a healthy weight, and avoiding smoking. These actions are linked to longer telomeres, which are associated with better health outcomes.

SGLT2 inhibitors cause weight loss primarily through urinary glucose excretion (energy loss) and osmotic diuresis (water loss), with long-term fat loss driven by a metabolic shift toward lipolysis and fatty acid oxidation.

SGLT2 inhibitors promote weight loss by excreting glucose in urine and shifting your body to burn fat. This works regardless of your starting weight, though the effect is modest (1-3 kg). It is not just water weight; long-term fat loss occurs. Because they don't cause hypoglycemia, you are less likely to overeat to prevent low blood sugar compared to other diabetes meds.

High plasma levels of Trimethylamine N-Oxide (TMAO) promote atherosclerosis and cardiovascular disease risk by impairing reverse cholesterol transport (RCT) and promoting foam cell formation.

High levels of TMAO, produced when your gut bacteria process nutrients like choline (eggs, meat) and carnitine (red meat), are linked to higher cardiovascular risk. This happens because TMAO impairs your body's ability to remove cholesterol from arteries (Reverse Cholesterol Transport). While you can't easily change your genes, understanding that gut bacteria play a key role suggests that dietary strategies might need to consider microbiome health, not just nutrient content.

High consumption of processed foods (up to 30% of calories in rich urban households) and palm oil (vanaspati) contributes to the 'double burden' of malnutrition and NCD risk, independent of total caloric intake.

Reducing the intake of processed foods and palm oil (vanaspati) is critical for improving health outcomes in India, especially for higher-income groups who consume these items frequently. Shifting away from subsidized cereals and processed foods toward whole foods can help address the double burden of malnutrition.

A prolonged sedentary lifestyle interacts additively with gut microbiota dysbiosis to significantly increase the prevalence of metabolic syndrome, whereas dietary changes associated with higher economic status (increased fruit/vegetable intake) do not independently drive this risk.

If you have a higher income or access to good food, do not assume your diet is the problem. This research suggests that the shift to a sedentary lifestyle (more sitting time) is a major, independent driver of metabolic syndrome, working alongside gut health issues. Prioritize reducing sedentary time as a primary intervention, not just dietary changes.

SNAP participants exhibit significantly lower diet quality and fail to meet American Heart Association (AHA) ideal diet goals compared to higher-income individuals, with disparities persisting or worsening for processed meats, added sugars, and nuts/seeds between 1999 and 2014.

For adults on SNAP, simply having access to food assistance does not guarantee adherence to heart-healthy dietary guidelines. Data shows that despite overall modest improvements in US diet quality, SNAP participants have not seen similar gains, with disparities worsening in key areas like processed meat and added sugar intake. Policy and individual interventions must address specific barriers to meeting AHA goals (fruits, vegetables, whole grains, limiting sodium/SSBs) rather than assuming income eligibility alone resolves diet quality issues.

Higher levels of daily physical activity, including non-exercise activity (standing, walking, fidgeting), are associated with higher self-reported happiness and positive affect.

You don't need to hit the gym to feel better. Simply moving more throughout your day—standing, walking, or fidgeting—is linked to higher happiness. Focus on increasing your general daily movement rather than stressing over intense workouts.

Concurrent food insecurity is significantly associated with lower odds of frequent breakfast and evening meal consumption, unhealthy eating habits, and unhealthy physical activity habits in college freshmen.

If you are experiencing financial stress that affects your food access, it is likely impacting your daily habits like skipping meals or feeling less active. This is a common, structural response to resource scarcity, not a personal failure. Prioritize accessing campus food pantries or meal plans if available, as they directly address the immediate barrier to healthy eating and activity.

Concurrent food insecurity is significantly associated with higher odds of experiencing stress and depressed mood in college freshmen.

Financial and food stress can significantly increase feelings of stress and depression. If you are struggling with food access, consider utilizing campus mental health resources alongside food assistance. Addressing both the physical and emotional aspects of food insecurity is crucial for overall well-being.

Dietary calcium intake reduces the risk of kidney stones, whereas supplemental calcium intake (especially without meals) may increase the risk.

If you are prone to kidney stones, prioritize getting calcium from food sources like dairy or leafy greens. If you must take supplements, take them with meals to help bind oxalate, as taking them between meals may increase your risk of stone formation.

Dementia caregivers experience significantly shorter sleep duration (losing 2.42 to 3.50 hours per week) and poorer sleep quality compared to age-matched non-caregivers, primarily due to stress-induced sleep latency and disturbances.

If you are a dementia caregiver, your sleep loss is real and measurable (2-3.5 hours/week less than peers). It is not just 'getting older.' Prioritize behavioral interventions like sleep hygiene, light therapy, or exercise, which have been shown to significantly improve sleep quality in this specific population.

Vitamin D supplementation reduces serum total cholesterol, LDL cholesterol, and triglycerides in individuals with baseline vitamin D deficiency, but has no beneficial effect on HDL cholesterol.

If you have high cholesterol and low Vitamin D, supplementation can help lower your total cholesterol and triglycerides. However, if your Vitamin D levels are already normal, supplementation is unlikely to improve your lipid profile. You should get your Vitamin D levels tested before relying on it for cholesterol management.

Directive front-of-pack warning labels (e.g., Chilean stop-sign style) significantly improve consumers' ability to quickly identify products with high levels of key nutrients (sodium, sugar, saturated fat, energy) compared to non-directive (GDA) and semi-directive (traffic-light) systems.

When choosing between products, look for packages with black warning labels (like the Chilean system). These labels are designed to grab your attention faster than traffic lights or numbers, helping you quickly spot items high in sugar, salt, or fat. Use this visual cue to avoid products with high levels of these nutrients.