Browse the evidence

Postprandial inflammation occurs after meals, particularly those high in glucose or fat, and is exaggerated in obese and diabetic individuals, but can be mitigated by antioxidants and specific dietary components.

Every meal causes a temporary spike in inflammation, which is higher in obese or diabetic people. You can reduce this spike by including antioxidants (like fruits/vegetables) and avoiding excessive advanced glycation end products (AGEs) from highly processed or charred foods.

Sleep quality and duration directly regulate glymphatic system efficiency, which clears neurotoxic protein waste (amyloid-beta, tau, alpha-synuclein) from the brain; age-related decline in deep NREM sleep reduces this clearance, contributing to protein aggregation and dementia risk.

Prioritize sleep quality and duration as a non-negotiable component of brain health. Focus on achieving deep NREM sleep, which is critical for glymphatic clearance. If you are aging, be aware that sleep fragmentation increases, so strategies to improve sleep hygiene and cardiovascular health (which drives the fluid flow) are essential to maintain cognitive function and reduce dementia risk.

The combination of high body mass index and low physical activity results in a substantially elevated risk of colon cancer, significantly higher than either factor alone.

Do not rely on exercise alone to offset the risks of excess weight. The combination of high body mass and low activity creates a synergistic risk for colon cancer. To minimize risk, aim for both regular physical activity and a healthy body weight, particularly reducing abdominal fat.

Individuals with metabolically healthy obesity (MHO) have a higher risk of cardiovascular disease and all-cause mortality compared to metabolically healthy lean individuals, despite having a lower risk than those with metabolically unhealthy obesity.

If you have obesity but normal blood work, you are not 'safe' like a lean person. Your risk for heart disease and early death is still higher than someone with a healthy weight. You should not ignore your weight, but you may prioritize preserving your current metabolic health over aggressive weight loss if it causes stress or muscle loss, while still addressing lifestyle factors like fitness and diet quality.

Higher consumption of ultra-processed foods is associated with a significantly increased risk of overall cancer and breast cancer.

This large-scale study indicates that increasing your intake of ultra-processed foods (like sugary drinks, packaged snacks, and processed meats) by 10% of your total diet is linked to a 12% higher risk of developing cancer and an 11% higher risk of breast cancer. To mitigate this risk, consider reducing the proportion of ultra-processed items in your diet and replacing them with less processed alternatives, as the specific processing artifacts and additives in these foods appear to contribute to cancer risk independent of basic nutritional content.

Higher body mass index (BMI) causally increases the risk of type-2 diabetes (T2D), with a 1 SD increase in BMI resulting in a 3.29-fold increase in T2D risk.

Maintaining a healthy BMI is one of the most effective ways to prevent type-2 diabetes. This study confirms that higher BMI directly causes a significantly higher risk of developing T2D. Focus on sustainable weight management through diet and physical activity to lower this risk.

Consumption of sugar-sweetened beverages is estimated to be responsible for 8.7% of type 2 diabetes cases in the US and 3.6% in the UK over a 10-year period, assuming causality.

On a population level, reducing sugar-sweetened beverage consumption could prevent a significant number of new diabetes cases in the US and UK. Public health policies targeting SSBs are supported by this evidence.

The Lipid Accumulation Product (LAP), calculated as (Waist Circumference - 65cm) × Triglycerides for men and (Waist Circumference - 58cm) × Triglycerides for women, is a superior predictor of cardiovascular risk factors compared to Body Mass Index (BMI).

To better assess your cardiovascular risk, ask your doctor for a Lipid Accumulation Product (LAP) calculation. This requires your waist circumference and a fasting triglyceride blood test. The formula is (Waist - 65) x Triglycerides for men, and (Waist - 58) x Triglycerides for women. This metric captures visceral fat and lipid overload, offering a more accurate risk prediction than Body Mass Index alone.

Chronic low-grade inflammation (inflammaging) is a key driver of sarcopenia, contributing to muscle protein breakdown and functional decline.

Managing chronic inflammation through lifestyle (diet, stress reduction) may help preserve muscle mass in older adults, in addition to resistance training.

Habitual consumption of sugar-sweetened beverages (SSBs) is associated with a significantly greater incidence of type 2 diabetes, independent of adiposity.

To lower your risk of type 2 diabetes, reduce your intake of sugar-sweetened beverages. Each daily serving increases your risk by approximately 13%, even if you maintain a healthy weight. Switching to artificially sweetened drinks or fruit juice does not remove this risk and is not a recommended strategy for prevention.

High-fat, low-fiber diets increase the risk of colon cancer by stimulating secondary bile acid synthesis and suppressing beneficial butyrate production.

Limiting animal fats and increasing fiber helps maintain a healthy balance of gut metabolites, specifically by reducing carcinogenic secondary bile acids and increasing protective butyrate.

Westernized diets high in fat and protein promote the growth of potentially pathogenic bacteria and increase the production of toxic metabolites like hydrogen sulfide and TMAO.

Reducing animal protein and fat can help shift gut bacteria away from pathogenic types that produce harmful metabolites.

Low hand-grip strength is a consistent predictor of premature mortality, disability, and postoperative complications in middle-aged and older adults.

Get your grip strength measured, especially if you are over 50. It is a simple, low-cost test that can predict your risk of future health issues like disability or death. If your grip is weak, it is a signal to focus on maintaining muscle function and overall health, potentially through resistance training and adequate nutrition.

Adherence to a Mediterranean diet (MedDiet) in older adults (65-79 years) modulates the gut microbiome to increase beneficial taxa (e.g., Faecalibacterium prausnitzii, Roseburia) and decrease harmful taxa, which is associated with reduced frailty, lower inflammation, and improved cognitive function.

For adults over 65, adopting a Mediterranean-style diet rich in vegetables, legumes, fruits, nuts, olive oil, and fish, while limiting red meat and saturated fats, can positively alter gut bacteria. This shift is linked to reduced inflammation, better cognitive function, and lower risk of frailty. Consistency over a year is key, and including a Vitamin D supplement (as per the study's guidelines) may support this process.

Eliminating extended work shifts (capping shifts at 16 hours) significantly increases sleep duration and reduces attentional failures in medical interns compared to traditional schedules with extended shifts.

For medical trainees and healthcare administrators: Structuring work shifts to cap continuous duty at 16 hours, rather than allowing 24+ hour shifts, significantly improves sleep and reduces errors. This is achieved not just by reducing total weekly hours, but by preventing the physiological toll of extended wakefulness. Implementing this schedule, potentially with encouraged napping, is a high-impact intervention for safety.

Untreated severe OSAS significantly increases long-term cardiovascular morbidity and mortality, whereas compliant CPAP treatment normalizes mortality rates to those of the general population.

If you have severe sleep apnoea, using your CPAP machine consistently every night is the most effective way to protect your heart and prevent early death. The severity of your apnoea matters less than your consistency in using the treatment.

OSAS is associated with an increased risk of stroke, with severity of sleep-disordered breathing correlating with stroke risk, and CPAP treatment may improve survival in stroke patients with OSAS.

If you have sleep apnoea, especially with a high apnoea-hypopnoea index, your risk of stroke is significantly higher. Treating OSAS with CPAP, particularly after a stroke, can improve your long-term survival.

Black, Hispanic, and Chinese adults have significantly higher odds of sleep disordered breathing (SDB) and short sleep duration compared to White adults, independent of obesity and other demographic factors.

If you are Black, Hispanic, or Chinese, you are statistically much more likely to have undiagnosed sleep apnea or short sleep than White individuals, even if you are not overweight. You should prioritize objective sleep testing (PSG) rather than relying on self-reported sleep quality, as standard screening often misses these populations.

A dietary fiber intake of 25 g/day is adequate for normal laxation in adults, with potential health benefits at higher intakes.

Consume 25 grams of dietary fiber daily to support normal bowel function. Sources include whole grain cereals, pulses, fruit, vegetables, and potatoes.

Adherence to a healthy dietary pattern, specifically the Mediterranean diet or a low Dietary Inflammatory Index (DII), is associated with a reduced risk of incident depression in longitudinal observational studies.

To lower your risk of depression, focus on adopting a Mediterranean-style diet or minimizing pro-inflammatory foods. This involves eating plenty of fruits, vegetables, whole grains, legumes, nuts, and olive oil, while limiting red meat, processed foods, and sugar. The evidence suggests that maintaining this pattern over time is associated with a significantly lower risk of developing depression.

Dietary fiber intake is inversely associated with cardiovascular disease (CVD) risk and CVD mortality, with a dose-response relationship showing reduced risk per 7-10g/day increment.

Increase total dietary fiber intake, particularly from cereal and vegetable sources, to reduce CVD risk. Aim for an increment of 7-10g/day of fiber, which is associated with a ~9-10% reduction in CVD risk. Prioritize whole grains and vegetables over ultra-processed foods, as the latter carry CVD risk even when adjusted for fiber content.

Higher microbiome diversity is associated with a 'health-related' cluster of host factors (e.g., higher HDL, vitamin D, physical activity) and lower abundance of certain pathogenic genera, while lower diversity is linked to a 'disease-related' cluster (e.g., high BMI, inflammation, diabetes markers).

Focus on building a diverse microbiome through a mix of healthy behaviors: eat plenty of fruits, vegetables, and whole grains, stay physically active, and manage stress. This holistic approach is associated with better clinical health markers and a more resilient gut ecosystem.

The association between specific gut bacteria (e.g., Faecalibacterium, Lachnospira) and health markers is robust and independent of overall microbiome diversity, whereas associations with other bacteria (e.g., Ruminococcaceae) are largely driven by overall diversity.

Don't get bogged down in specific probiotic strains. Instead, focus on lifestyle habits (diet, exercise) that are known to support a healthy microbiome. This study suggests that these habits naturally foster beneficial bacteria like Clostridiales, which are linked to better health outcomes.

Lower grip strength is independently associated with increased all-cause mortality in men aged 60 and older, with higher strength levels conferring a protective effect.

For men over 60, maintaining higher grip strength is a strong predictor of living longer, independent of how much muscle you have or how active you are. Focus on resistance training to maintain or improve hand grip strength, as this functional measure is a key indicator of overall health and longevity.