Browse the evidence

Adherence to a Western-style diet (high in saturated fat, sugar, sodium, and red meat) significantly increases the risk of developing chronic kidney disease (CKD) and accelerates renal function decline through mechanisms involving oxidative stress, inflammation, and lipid accumulation.

To protect your kidneys, minimize intake of highly processed foods, sugary drinks, red meat, and high-sodium items. These components collectively drive inflammation and oxidative stress in the kidneys. Prioritize whole foods, plant-based proteins, and fruits/vegetables to reduce CKD risk.

Closed-loop acoustic stimulation delivered during NREM sleep enhances slow wave activity (SWA) and improves declarative memory consolidation without increasing arousals.

To improve sleep quality and memory, consider using a closed-loop acoustic stimulation device during your night's sleep. These devices deliver gentle sounds timed to your brain's slow waves, boosting deep sleep without waking you up. This method is safer and less likely to cause side effects than sleep medications.

High sugar intake is associated with increased risk of dental caries, overweight, and cardio-metabolic risk factors, although the direct causal link to body adiposity may be mediated by total energy intake rather than sugar itself.

Reducing sugar intake is a valid strategy for improving health, particularly for dental health and metabolic markers like blood pressure and lipids. However, for weight management, the key factor is total energy intake. Replacing sugar with other carbohydrates without reducing overall calories will not lead to weight loss. Prioritize reducing high-calorie sweet products and beverages to lower total energy intake.

Inulin and polydextrose provide beneficial gastrointestinal effects (fermentability, bifidogenic activity, laxation) similar to grain fiber, but their effects on postprandial glucose and fasting cholesterol are modest or inconsistent compared to the variable but often stronger effects of grain fibers.

If you are using fiber supplements like inulin or polydextrose, expect them to help with digestion and gut health (bifidogenic effects, laxation). However, do not rely on them to significantly lower cholesterol or blood sugar; whole grain fibers are more effective for those metabolic goals, though even they vary. A varied diet providing fiber from different sources is recommended.

Heart-rate variability (HRV) serves as a valid biomarker for assessing the physiological and psychological health impacts of dietary interventions, with higher HRV indicating better autonomic regulation and resilience.

Use HRV as a key indicator of how your diet affects your overall health and stress resilience. Higher HRV is generally associated with better health outcomes, including lower risk of cardiovascular disease, diabetes, and psychiatric disorders. While more research is needed on specific foods, maintaining a diet that supports high HRV (e.g., Mediterranean diet, omega-3s) is a valid strategy for improving long-term physiological and psychological well-being.

Nurses with more than 30 quick returns (less than 11 hours between shifts) per year have a significantly higher risk of insomnia, excessive sleepiness, and shift work disorder compared to those with no quick returns.

If you work shifts, ensure you have at least 11 hours between your last shift and your next start time. Failing to do so (a 'quick return') significantly increases your risk of insomnia, excessive sleepiness, and Shift Work Disorder, especially if you have more than 30 such instances per year. Prioritize schedules that allow for adequate recovery time over those that offer longer consecutive days off at the expense of daily recovery.

Genetically predicted accelerometer-assessed physical activity causally decreases the risk of COVID-19 hospitalization.

Prioritize physical activity measured by devices (accelerometers) over self-reported estimates, as it is causally linked to reduced COVID-19 hospitalization risk. While the effect size is modest, combining this with reduced leisure sedentary time (like TV watching) may offer better protection.

Rapid weight loss via caloric and fluid restriction (approx. 5% body weight over 7 days) impairs physical performance, alters mood negatively, and disrupts endocrine balance in judo athletes.

If you are an athlete in a weight-class sport, avoid losing 5% of your body weight in the week before competition through severe restriction. This study shows that doing so significantly reduces your grip strength and negatively impacts your mood (increasing fatigue and tension) and hormonal balance, even if you have time to rehydrate and eat before the event. Prioritize maintaining your natural weight to preserve performance capacity.

Sleep disturbance (insomnia, fragmented REM) following trauma impairs the consolidation of extinction memory, thereby contributing to the development and perpetuation of PTSD.

If you have experienced trauma, prioritizing sleep quality is a critical part of recovery, not just a comfort. Sleep disturbances like insomnia or fragmented REM sleep can prevent your brain from properly processing and 'extinguishing' fear memories, potentially leading to PTSD. Addressing sleep issues, either through lifestyle changes or therapy, is a key step in preventing long-term psychological damage.

Adopting a diet with higher pro-inflammatory potential, as measured by the Dietary Inflammatory Index (DII), is directly associated with an increased risk of cardiovascular disease (CVD) events, including myocardial infarction, stroke, and cardiovascular death.

To lower your risk of heart attack or stroke, prioritize a diet that minimizes inflammation. This means eating more fruits, vegetables, whole grains, nuts, and olive oil (characteristic of a Mediterranean diet) while limiting processed meats, refined grains, and sugary beverages. You do not need to track a specific index; adopting these anti-inflammatory food patterns is the actionable step.

Physical activity performed during youth confers lifelong benefits in cortical bone size and strength that persist even after cessation of activity, whereas benefits in bone mass are lost.

Encourage high-impact or loading physical activities during youth to maximize bone size and strength. These structural benefits persist lifelong, providing a protective buffer against fractures in old age, even if bone mass declines later. Focus on building a larger, stronger skeletal frame early in life.

Continuing physical activity (throwing) into old age reduces age-related cortical bone loss and maintains more bone strength benefits than ceasing activity, though it does not add to bone size benefits.

Maintain loading physical activities into old age to preserve bone strength and reduce structural decay. While you may not increase bone size further, continuing activity helps maintain the strength benefits gained in youth by preventing accelerated bone loss.

Extreme mountain ultra-marathons (approx. 166 km with significant elevation change) cause severe neuromuscular fatigue, including both central and peripheral components, with full recovery of maximal force capacity occurring within 9 to 16 days.

After completing an extreme mountain ultra-marathon (like the UTMB), expect significant muscle weakness and fatigue. Do not rush back into intense training. Most recovery happens within the first 9 days, but full neuromuscular function may take up to 16 days. Prioritize rest and light activity during this period.

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.

Poor sleep quality is associated with increased longitudinal cortical atrophy in community-dwelling adults, particularly those over the age of 60.

Prioritize sleep quality as a critical component of brain health, especially as you age. Poor sleep is linked to brain shrinkage (atrophy) in key areas. Focus on improving sleep efficiency (time asleep vs. time in bed) rather than just duration. If you are over 60, this link is even stronger. Consult a sleep specialist if you have chronic sleep issues.

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.

Acute vibration exercise (VbX) enhances upper and lower-body muscle power, primarily through neural factors such as the tonic vibration reflex and muscle spindle activation, rather than structural muscle hypertrophy.

If you want to improve explosive power (like jumping), vibration exercise can help, especially if you are an athlete or older adult. It works by stimulating your nervous system to fire muscles faster, not by building big muscles. Use frequencies around 26-30 Hz, but note that results depend heavily on the specific machine and your posture.

Optimal vibration frequency is individualized based on neuromuscular response (EMG), with evidence suggesting 26-30 Hz may be effective for power, but fixed frequencies may not maximize benefits for all users.

If you have access to EMG testing, individualize your vibration frequency for best power results. If not, a frequency around 26-30 Hz is a scientifically supported starting point, though it may not be optimal for everyone.

Higher relative abundance of Oscillospira members in the fecal microbiome is significantly associated with lower visceral fat mass, suggesting a protective role against cardio-metabolic risk.

Focus on reducing visceral fat through lifestyle changes, as specific gut bacteria (like Oscillospira) are strongly linked to lower visceral fat levels. While your genetics influence your baseline microbiome, the association with visceral fat suggests that managing abdominal adiposity may positively influence your gut microbial profile, potentially lowering cardio-metabolic risk.

Lower fecal microbiome alpha diversity (Shannon diversity) is significantly associated with higher visceral fat mass and overall abdominal adiposity.

Maintaining a diverse gut microbiome is associated with lower visceral fat. While the paper does not prescribe a specific diet, the strong link between low diversity and high visceral fat suggests that dietary patterns supporting microbial diversity (typically high fiber, varied plant foods) may be beneficial for managing abdominal fat.

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.

Resistance training with either heavy or light-moderate loads produces only small gains in muscle size (hypertrophy) in the elderly, with no significant difference between the two intensity levels when work is matched.

Do not expect significant muscle growth from resistance training as an elderly adult. While you will likely get stronger, your muscle size will only increase slightly, if at all. Focus on the functional benefits of strength rather than aesthetics.

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.