Browse the evidence

In older adults, higher abdominal adiposity (high waist circumference) is associated with increased frailty regardless of BMI, including in underweight individuals.

If you are an older adult, focus on your waist size, not just your weight. Even if you are underweight, carrying fat around your middle increases your risk of frailty. Regular physical activity can help reduce abdominal fat and improve function, independent of weight loss.

In older adults, both low BMI (<20) and very high BMI (≥35) are associated with increased frailty, forming a U-shaped relationship.

For older adults, maintaining a healthy weight range (BMI 20-29.9) is associated with the lowest risk of frailty. Both being underweight and very overweight increase this risk. Focus on balanced nutrition and physical activity to maintain muscle mass and healthy body composition.

Higher cardiorespiratory fitness (CRF) is inversely associated with all-cause mortality with no observed upper limit of benefit, meaning extreme fitness levels provide greater survival advantages than moderate fitness.

Focus on improving your cardiorespiratory fitness through aerobic exercise. This study shows that higher fitness levels correlate with significantly lower mortality risk, and there is no 'ceiling' where more fitness becomes harmful. Even if you have conditions like hypertension, achieving high fitness levels offers significant survival advantages.

Dietary intake of omega-3 fatty acids (approx. 1.5 g/day) modestly mitigates the progression of coronary atherosclerosis and promotes regression in patients with established coronary artery disease over a 2-year period.

If you have coronary artery disease, taking approximately 1.5 grams of omega-3 fatty acids daily (from fish oil) for two years can help slow the progression of plaque buildup in your arteries and may even encourage some regression. This benefit occurs even if your LDL cholesterol levels rise slightly, suggesting the mechanism works directly on the artery walls or blood flow rather than just cholesterol levels. Consult your doctor before starting, especially given the dosage.

While HP-HMB supplementation significantly reduces mortality and improves nutritional status (SGA class) and body weight at 30 days, it does not significantly reduce the rate of nonelective hospital readmission in malnourished older adults.

If you are an older adult hospitalized for heart or lung issues and are malnourished, using a high-protein HMB supplement will likely help you gain weight and improve your nutritional status, and it may save your life. However, you should not expect it to prevent hospital readmissions on its own.

Individuals with prediabetes exhibit an aberrant gut microbiota profile characterized by a significant depletion of the genus Clostridium and the mucin-degrading bacterium Akkermansia muciniphila, which correlates with markers of poor metabolic health.

If you have prediabetes, your gut bacteria likely look different than those of someone with normal glucose regulation, specifically showing lower levels of beneficial bacteria like Akkermansia and Clostridium. While this is a strong indicator of metabolic stress, simply changing your diet to target these bacteria may not be enough to reverse insulin resistance without addressing broader metabolic factors, as the microbiota change alone does not appear to cause the glucose intolerance in animal models.

Weakness combined with normal lean mass still carries a high risk of mobility impairment, suggesting that muscle quality (function) is distinct from muscle quantity (mass).

You can have normal muscle size but still be 'weak' and at high risk for mobility issues. This is often due to muscle quality (fat infiltration, nerve function) rather than size. Strength training can improve function even if muscle size doesn't change dramatically.

Low skeletal muscle mass (sarcopenia) in elderly ICU patients is significantly associated with increased mortality, decreased ventilator-free days, and decreased ICU-free days, whereas traditional nutritional markers like BMI and serum albumin are not predictive of these outcomes.

For elderly trauma patients, standard weight checks (BMI) and blood tests (albumin) are insufficient to assess risk. Measuring skeletal muscle mass via CT scans at admission is critical for identifying high-risk patients who may need aggressive nutritional and rehabilitative support to improve survival and reduce ICU stay.

Continuous positive airway pressure (CPAP) therapy significantly reduces subjective and objective daytime sleepiness in patients with obstructive sleep apnea (OSA) compared to placebo.

If you have obstructive sleep apnea, using CPAP therapy nightly will significantly reduce your daytime sleepiness compared to doing nothing or using a placebo treatment. This benefit is most pronounced if your sleep apnea is severe. While previous reviews questioned its effectiveness, current evidence from multiple randomized trials confirms CPAP works to improve both how sleepy you feel and objective sleep tests.

Patients with severe obstructive sleep apnea (AHI >= 30) and significant baseline sleepiness (ESS >= 11) experience a significantly greater reduction in sleepiness from CPAP therapy than patients with milder symptoms.

If you have severe sleep apnea and feel very sleepy during the day, CPAP is likely to make a dramatic difference in your energy levels. For those with milder symptoms, the improvement in sleepiness might be minimal or unnoticeable, though CPAP may still be recommended for other health reasons.

The magnitude of depressive symptom reduction from resistance exercise training is larger in individuals with mild to moderate depression compared to those with subclinical symptoms.

If you are experiencing mild to moderate depressive symptoms, resistance exercise training is likely to provide a substantial reduction in those symptoms. While it also helps those with subclinical symptoms, the effect is significantly larger for those with elevated baseline scores.

High predicted fat mass is strongly and monotonically associated with increased all-cause, cardiovascular, and cancer mortality in men, whereas low predicted lean body mass is the primary driver of the 'obesity paradox' (increased mortality at low BMI).

For men, maintaining muscle mass is as critical as managing fat for longevity. High fat mass increases mortality risk linearly, while low muscle mass increases risk significantly. Focus on resistance training to preserve lean mass and dietary quality to manage fat, rather than just chasing a specific BMI number.

Light to moderate alcohol consumption (1-14 g/day) is associated with lower all-cause and cardiovascular mortality compared to abstinence or heavy drinking, but heavy consumption increases cancer mortality.

If you drink alcohol, limit yourself to one drink or less per day. This level of consumption is associated with lower all-cause and cardiovascular mortality compared to abstinence or heavy drinking. However, be aware that heavy drinking increases your risk of cancer. If you do not drink, there is no compelling reason to start for health benefits, especially given the cancer risk associated with heavier use.

Alginate serves as a biocompatible and biodegradable material for drug delivery, including the encapsulation of probiotics and insulin.

Alginate is widely used to deliver medications and probiotics effectively. It protects these substances from degradation and ensures they reach their target in the body. This makes it a valuable component in many health supplements and pharmaceuticals.

Limiting repetition velocity loss to 20% during resistance training yields greater improvements in explosive power (countermovement jump) and preserves fast-twitch muscle fiber types (MHC-IIX) compared to allowing 40% velocity loss, despite producing significantly lower total training volume and less muscle hypertrophy.

If your goal is explosive power (like jumping or sprinting), stop your sets when your bar speed drops by 20% from your fastest rep. Do not push until you are slow or failing. This approach builds power and preserves fast-twitch muscle fibers better than training close to failure, even though you do fewer total reps. If your goal is pure muscle size, you might need to train closer to failure (40% velocity loss).

Self-administered Food Frequency Questionnaires (FFQs) used in large cohorts provide valid estimates of macronutrient and food group intake, though they may underestimate micronutrient intake compared to 24-hour recalls.

Diet surveys are generally good at tracking big nutrient groups like fat and protein, but might miss precise amounts of certain vitamins and minerals.

Higher body mass index (BMI) is associated with a dose-response increase in the risk of severe COVID-19 outcomes, including hospitalization, ICU admission, invasive mechanical ventilation, and death, with the lowest risk observed at BMIs near the healthy weight/overweight threshold (23.7–25.9 kg/m²).

Maintaining a BMI in the healthy weight range (18.5–24.9 kg/m²) is associated with the lowest risk of severe COVID-19 outcomes, including hospitalization and death. If you have obesity or are overweight, you are at a higher risk for severe illness, and this risk increases with higher BMI categories. Public health recommendations include prioritizing vaccination, masking, and accessing resources to support a healthy weight through nutrition and physical activity.

Heat exposure during sleep increases wakefulness and decreases slow wave sleep (SWS) and REM sleep, primarily by suppressing the normal nocturnal decline in core body temperature (Tcore) and increasing skin blood flow.

To optimize sleep, keep your bedroom cool enough to allow your core body temperature to drop. Heat exposure, especially humid heat, disrupts deep sleep (SWS) and REM by preventing this natural cooling process. Use air conditioning or cooling bedding to maintain a thermoneutral environment, particularly during the first half of the night.

Cold exposure during sleep does not significantly disrupt sleep stages (SWS/REM) when bedding and clothing are used, but it significantly alters cardiac autonomic activity (increasing parasympathetic dominance) without affecting subjective sleep quality.

Even if you sleep well in a cold room, your heart is under stress. Cold exposure increases cardiac parasympathetic activity and blood pressure fluctuations during sleep, which may increase cardiovascular risk, especially in the elderly. Keep your bedroom temperature above 10°C and use adequate bedding to minimize this hidden stress.

Humid heat exposure has a more severe disruptive effect on sleep stages (specifically SWS) than dry heat, particularly when exposure occurs in the initial segment of sleep.

In humid climates, use air conditioning during the first half of the night to prevent severe disruption of deep sleep (SWS). Humidity prevents sweat evaporation, causing excessive heat stress that suppresses core temperature drop and increases wakefulness. Turning off AC early leads to poor sleep quality.

Endurance exercise training improves cardiovascular function (maximal oxygen intake, stroke volume, and cardiac index) in healthy older men to a degree that is not significantly different from young men, despite age-related declines in resting and peak exercise hemodynamics.

If you are a healthy older man, starting a supervised endurance training program (walking, jogging, cycling) 4-5 times a week for 45 minutes can significantly improve your heart's ability to pump blood and your overall endurance. You can expect improvements in your maximum oxygen uptake and stroke volume that are comparable to those seen in young men, proving that age does not preclude cardiovascular adaptation.

Maintaining a metabolically healthy obese (MHO) phenotype is associated with lower waist circumference and younger age, and these individuals have diabetes and cardiovascular disease risks similar to metabolically healthy normal-weight subjects.

If you are obese but have normal blood pressure, cholesterol, and blood sugar, you are not automatically 'safe' from long-term health risks. Your risk of developing diabetes or heart disease is similar to normal-weight healthy people ONLY IF you maintain this metabolic health. The study suggests that keeping your waist circumference low and staying younger (or aging gracefully) are key to staying in this 'healthy obese' category. However, this state is unstable for many; about one-third of metabolically healthy obese individuals develop metabolic risks over 5-10 years. Focus on maintaining a healthy waistline rather than just BMI.

High consumption of processed meat (≥160 g/day) is associated with significantly higher all-cause mortality compared to low consumption (10-19.9 g/day), with a hazard ratio of 1.44.

Limit processed meat intake to less than 20 grams per day. The study estimates that doing so could prevent 3.3% of deaths in this population. Focus on unprocessed meats and plant-based proteins instead.

High consumption of red meat (≥160 g/day) is associated with higher all-cause mortality, but this association attenuates and becomes non-significant after correcting for measurement error.

While high red meat intake shows a weak link to mortality, the link is not statistically significant after accounting for reporting errors. Focus on limiting processed meats instead.