Browse the evidence

In statin non-users with metabolic syndrome, consuming 1 cup of blueberries daily for 6 months significantly increases HDL cholesterol, HDL particle number, and apolipoprotein A-I levels.

If you have metabolic syndrome and are not taking statins, eating one cup of blueberries daily for six months may improve your HDL cholesterol and particle numbers. This benefit was not observed in those taking statins, suggesting medication may interfere with this specific dietary effect.

Infusion of PYY3-36 at supraphysiological doses (0.8 pmol/kg/min) significantly reduces energy intake in both lean and obese subjects, primarily through increased sympathoadrenal activity (thermogenesis and lipolysis), though this effect is accompanied by significant side effects like nausea.

Infusing PYY3-36 at high doses significantly cuts food intake, but it comes with a high cost of nausea and discomfort. The current delivery method (infusion) creates a narrow therapeutic window where effective doses cause significant side effects. Until administration methods can provide stable plasma levels without these peaks, this hormone is not a practical standalone solution for obesity management via this route.

All three exercise modes (RT, WBVT, and MT) significantly improve Timed Up and Go (TUG) times in older adults with sarcopenia, but none improve Chair Stand (CS) times.

Even if your ability to stand up from a chair (Chair Stand) doesn't improve, your ability to get up and walk (Timed Up and Go) will likely improve with any exercise regimen (RT, WBVT, or MT). This is a key functional benefit for fall prevention. Focus on consistency (1-5x/week) for at least 6 weeks.

In individuals aged 80 and older, higher grip strength and higher physical performance (SPPB score) are strong, independent predictors of lower all-cause mortality and lower risk of hospitalization.

For adults over 80, maintaining the ability to walk, rise from a chair, and balance (physical performance) is more critical for avoiding hospitalization and death than simply having large muscles or high grip strength. Focus on functional exercises that improve balance and mobility rather than just lifting weights.

Skeletal muscle depletion, measured by CT imaging, is associated with significantly decreased overall and disease-specific survival in patients with head and neck squamous cell carcinoma undergoing radiotherapy.

For HNSCC patients undergoing radiotherapy, maintaining skeletal muscle mass is critical for survival. Standard weight monitoring may miss dangerous muscle loss; clinicians should consider body composition assessments (like CT-derived skeletal muscle index) to identify high-risk patients who might benefit from early, aggressive nutritional or exercise interventions.

Targeted communication strategies that align with specific consumer segments' involvement, health motives, or trust levels significantly increase the likelihood of information processing and positive food choice behavior compared to generic mass-media campaigns.

Do not rely on generic health campaigns or mass media advertising to change eating habits. Instead, segment your audience based on their specific motivations (e.g., health-conscious vs. taste-focused) and trust levels. Tailor your communication to address their specific information needs and use trusted sources relevant to that segment. For low-involvement consumers, use simple heuristics (like brand reputation) rather than complex nutritional data.

Short-term carbohydrate deficiency (50% deficit for 5 days) reduces fasting hepatic glucose production (HGP) and improves the sensitivity of HGP to suppression by insulin, leading to increased fat oxidation.

Reducing carbohydrate intake for several days lowers your liver's glucose output and makes your body more sensitive to insulin. This metabolic shift encourages your body to burn fat for energy instead of glucose.

Specific nutraceuticals (SAMe, omega-3, methylfolate, Vitamin D) show efficacy as adjunctive therapies for depression, while others (zinc, folic acid, vitamin C, tryptophan) have limited support.

If considering supplements for depression, focus on those with stronger evidence like SAMe, omega-3 (high EPA), methylfolate, and Vitamin D as adjuncts to standard care. Be skeptical of claims for zinc, vitamin C, or tryptophan as primary treatments.

Short sleep duration (e.g., 5 hours vs 8 hours) causes hormonal shifts (lower leptin, higher ghrelin) and elevated cortisol that increase appetite and abdominal fat deposition, thereby promoting obesity.

Prioritize getting 7-9 hours of sleep. Short sleep duration directly alters hunger hormones (lowering satiety signals like leptin and raising hunger signals like ghrelin) and increases cortisol, which drives cravings for high-fat, high-sugar foods and abdominal fat storage. Fixing sleep is a primary lever for weight management.

Interventions targeting physical activity in aging adults (mean age ≥60) produce a small but statistically significant positive effect on activity levels (dw = .26).

For older adults, simply being told the health benefits of exercise (health education) is not enough to drive significant behavior change. To effectively increase physical activity, interventions should focus on active strategies: recommend moderate-intensity activity, use center-based exercise settings, deliver the program in groups, and require participants to self-monitor their activity. These active components yield significantly larger improvements than passive education alone.

Low muscle glycogen availability shifts fuel utilization towards increased lipid oxidation and reduced carbohydrate oxidation during exercise.

If you want to maximize fat oxidation during exercise, starting with low muscle glycogen (e.g., fasted or after a low-CHO meal) will shift your body to burn more fat. However, this comes at the cost of reduced carbohydrate oxidation and potentially lower performance intensity.

Avoidance of midlife risk factors (overweight, hyperglycemia, hypertension, smoking, excessive alcohol, low grip strength, high triglycerides, low education, unmarried status) is associated with a significantly higher probability of exceptional survival (survival to age 85+ free of major chronic diseases and impairments) in men.

Focus on managing midlife health markers. Maintain a healthy weight, control blood pressure and blood sugar, avoid smoking and excessive alcohol, stay physically active (grip strength is a proxy for physical robustness), and consider social connections. These factors collectively determine your odds of living a long, healthy life.

Roux-en-Y gastric bypass surgery reduces long-term dietary fat intake and preference for high-fat foods in humans and rats, likely mediated by conditioned taste aversion and elevated postprandial GLP-1 levels.

For patients undergoing gastric bypass, the surgery not only restricts stomach size but also biologically reduces the desire for high-fat foods. This is driven by increased gut hormones (GLP-1, PYY) and conditioned taste aversion, where high-fat meals may cause mild discomfort, leading to a natural shift toward lower-fat diets. This physiological shift supports long-term weight maintenance.

A reduced-fat ad libitum diet improves body weight and glucose tolerance in individuals with glucose intolerance, but these benefits are not sustained at 5 years unless the participant maintains high compliance with the dietary intervention.

If you have impaired glucose tolerance, switching to a lower-fat diet can help you lose weight and improve your blood sugar levels for up to three years. However, this benefit fades after five years unless you strictly maintain the diet. To succeed long-term, you need ongoing support, such as regular check-ins or group sessions, to help you stick with the changes against environmental pressures.

Short sleep duration (less than 6 hours per night) is associated with increased body mass index (BMI) and obesity risk, with a stronger and more consistent association observed in children and young adults compared to older adults.

Prioritize getting at least 7-8 hours of sleep per night. If you are struggling with weight management, especially if you are younger, insufficient sleep may be driving your hunger hormones (ghrelin/leptin) to increase appetite and cravings. Consistent sleep duration is as important for weight control as diet and exercise.

Obese individuals systematically and significantly underreport their energy intake compared to lean individuals, with underestimation ranging from 30% to 47%.

If you are overweight, your food diary is likely underestimating your actual calorie intake by 30-47%. Do not trust your self-reported numbers at face value. Use a validated method like the multiple-pass 24-hour recall with a clinician, and expect that you are likely eating more than you think, especially regarding snacks and high-fat foods.

Obese individuals selectively underreport high-calorie, 'bad' foods (cakes, snacks, sodas) while reporting low-calorie, 'good' foods (vegetables, fruits) with similar accuracy to lean individuals.

When tracking your diet, you are likely omitting snacks, sodas, and high-fat foods because you view them negatively. To get an accurate picture, you must record these items honestly, even if you feel they are 'bad'.

Variations in non-exercise activity thermogenesis (NEAT) are the primary driver of inter-individual differences in total daily energy expenditure (TDEE), whereas resting metabolic rate (RMR), diet-induced thermogenesis (DIT), and exercise energy expenditure are highly reproducible with low intra-individual variability.

Focus on increasing your daily non-exercise movement (NEAT) rather than relying solely on structured exercise or worrying about your resting metabolic rate. NEAT, which includes all daily activities like standing, walking, and fidgeting, varies several-fold between people and is the primary driver of differences in total energy expenditure. Factors like occupation, environment, and genetics heavily influence NEAT, making it the most impactful lever for energy balance compared to the highly reproducible metrics of RMR or exercise.

Using larger dinnerware (plates/bowls) increases food serving size, total consumption, and food waste due to visual consumption norms anchored by plate-fill levels, regardless of prior education about the bias.

If you are serving yourself at a buffet or using large plates at home, expect to serve, eat, and waste significantly more food than if you used smaller plates. Education or willpower will not fix this automatic visual bias. To reduce intake and waste without feeling deprived, switch to smaller plates (e.g., 21cm vs 26.5cm) to reset your visual consumption norm.

Short-term sleep restriction (typically <6 hours/night) increases vulnerability to obesity by dysregulating appetite hormones (lowering leptin, raising ghrelin) and increasing subjective hunger and caloric intake, particularly from high-calorie carbohydrates.

Prioritize getting 7-9 hours of sleep. If you are consistently sleeping less than 6 hours, you are biologically predisposed to eat more, especially high-calorie carbs, due to hormonal shifts. Fixing sleep may be as important for weight management as diet and exercise.

Short sleep duration (<6 hours/night) is associated with an increased risk of developing type 2 diabetes and hypertension, independent of obesity, through mechanisms involving impaired glucose tolerance and insulin resistance.

Aim for 7-9 hours of sleep to protect your metabolic health. Chronic short sleep is linked to a higher risk of developing type 2 diabetes and high blood pressure, even if you maintain a healthy weight. Prioritizing sleep is a key preventive health strategy.

Female gender is an independent risk factor for poor sleep quality in young adults, with a prevalence of 65.1% compared to 49.8% in males, a disparity that persists after adjusting for depression, socio-demographics, and lifestyle factors.

If you are a young woman struggling with sleep, know that your risk is statistically higher than men's, even if your lifestyle and mental health are good. This isn't just 'in your head' or due to stress. While you should still optimize sleep hygiene and manage stress, recognizing a potential biological predisposition can help in seeking more targeted or specialized interventions if standard lifestyle changes aren't enough.

Lifestyle factors such as smoking and frequent drug use are significantly associated with poor sleep quality in young males, but not in young females.

For young men, quitting smoking and avoiding frequent drug use may be particularly effective strategies for improving sleep quality, as these factors appear to have a stronger negative impact on male sleep than female sleep. Women should also avoid these, but the data suggests the link is stronger in men.

Sarcopenia in liver transplant candidates is defined by a Skeletal Muscle Index (SMI) <50 cm2/m2 in men and <39 cm2/m2 in women, measured via CT at L3, and is a strong predictor of adverse outcomes including mortality and complications.

If you have cirrhosis and are being evaluated for a liver transplant, ask your care team about getting a CT scan to measure your muscle mass (SMI). This is a standard part of the evaluation and helps predict your risk for complications. It is not just about how you look, but the actual muscle tissue measured at the L3 vertebra.