Browse the evidence

A comprehensive package of six physical activity interventions (pedometers, mass media, internet, GP prescription, TravelSmart, GP referral) leads to substantial population health improvements and net cost savings for the health sector.

Implementing a mix of strategies—pedometers, media campaigns, internet resources, GP prescriptions, active transport incentives, and clinical referrals—works together to save the healthcare system money while significantly improving public health. The combined effect is greater than any single intervention alone.

Dietary omega-3 polyunsaturated fatty acids (EPA, DHA, ALA) modulate gut microbiota composition by increasing beneficial bacteria (Bifidobacteria, Lactobacilli, Akkermansia) and decreasing pathogenic or pro-inflammatory bacteria (Enterobacteria, Firmicutes-to-Bacteroidetes ratio), thereby improving intestinal barrier function and reducing systemic inflammation.

To support gut health and reduce inflammation, ensure adequate intake of omega-3 fatty acids (EPA and DHA) through diet (fatty fish) or supplementation. This helps increase beneficial gut bacteria like Bifidobacteria and reduces harmful bacteria, supporting intestinal barrier integrity. This is particularly relevant if you have conditions like obesity or IBD.

Omega-3 PUFAs reduce intestinal inflammation and immune response by inhibiting pro-inflammatory signaling pathways (NF-κB, MAPK) and promoting anti-inflammatory mediators (IL-10, SCFAs like butyrate).

If you suffer from inflammation or gut issues, omega-3s (EPA/DHA) can help by directly reducing inflammatory signaling in the gut. This is achieved by blocking pro-inflammatory pathways and boosting anti-inflammatory factors. This benefit is most pronounced when using direct sources of EPA/DHA rather than just plant-based ALA.

Omega-3 PUFAs can alleviate symptoms of Non-Alcoholic Fatty Liver Disease (NAFLD) and obesity by modulating gut microbiota and reducing hepatic lipid content.

For those with NAFLD or obesity, omega-3 supplementation (EPA/DHA) can help reduce liver fat and improve metabolic markers. This is achieved by modulating gut bacteria and reducing inflammation. It is a supportive strategy alongside lifestyle changes.

Increased smartphone screen-time, particularly during the hour of and after bedtime, is associated with poorer sleep quality, reduced sleep efficiency, and longer sleep onset latency.

To improve sleep, minimize smartphone use during the hour before and after your intended bedtime. The study shows that screen time during these specific windows is linked to longer time to fall asleep and poorer sleep quality. If you must use your phone, use 'night mode' to reduce blue light, but be aware that engaging content can also stimulate your brain and delay sleep onset.

Higher magnesium intake is inversely associated with systemic inflammation (measured by plasma CRP) and a lower prevalence of metabolic syndrome in middle-aged and older women.

Focus on increasing magnesium-rich foods like whole grains, green leafy vegetables, legumes, and nuts. This study found that women with the highest intake of these foods had significantly lower levels of systemic inflammation (CRP) and a 27% lower risk of metabolic syndrome compared to those with the lowest intake. While this is observational, the biological plausibility and strong statistical association support prioritizing these foods for metabolic health.

Retirement can serve as a positive transition point for increasing leisure-time physical activity, particularly moderate-intensity activities like walking, although work-related activity may decrease.

For those retiring from sedentary jobs, use the newfound time to gradually increase moderate-intensity activities like walking. Be aware that total activity might drop if you were previously physically active at work.

Preoperative correction of nutritional deficiencies is recommended to mitigate the increased risk of postoperative deficiencies, as surgery further impacts oral intake and absorption.

Before your surgery, get your blood work done. If you are low in iron, Vitamin D, or B12, your dietitian will help you correct it. This gives you the best possible starting point for recovery.

Fucoxanthin supplementation induces uncoupling protein 1 (UCP1) expression in white adipose tissue, stimulating adaptive thermogenesis and increasing resting energy expenditure to promote weight loss.

To leverage fucoxanthin for weight loss, aim for a daily dose of 4-8 mg, potentially sourced from brown seaweed extracts. This intervention works by increasing your resting energy expenditure through thermogenesis, meaning you burn more calories at rest. While not a magic bullet, it supports weight loss efforts by enhancing metabolic rate.

Daytime napping, particularly long-duration naps (>= 1 hour), is associated with an increased risk of all-cause mortality, type 2 diabetes, and chronic respiratory disease, likely serving as a marker for underlying health issues or sleep deprivation compensation.

If you find yourself needing long daytime naps (over 1 hour), view it as a signal to prioritize your nighttime sleep. Long naps are associated with higher risks of diabetes and mortality, especially in older adults. Focus on getting 7-8 hours of quality nighttime sleep rather than relying on long daytime naps to compensate.

Higher dietary intake of vegetables and potassium is associated with a significantly decreased odds of developing incident chronic kidney disease (CKD).

If you do not have diagnosed kidney disease, increasing your intake of vegetables and potassium-rich foods is a proven way to lower your risk of developing kidney disease later in life. Focus on whole food sources like vegetables rather than supplements, as the study highlights dietary patterns. This is a primary prevention strategy, not a treatment for existing kidney damage.

Body fat percentages of 32-35% in women are associated with adverse skeletal outcomes, suggesting a lower obesity cutoff for older women than the WHO standard of 40%.

For older women, aim for a body fat percentage below 32-35% to protect bone health, rather than relying on the standard 40% cutoff.

Insoluble cereal fiber (e.g., wheat bran) is associated with reduced cardiovascular disease risk in population studies, despite having no significant effect on fasting blood lipids.

Eat more whole grains and cereals for heart health. While this won't directly lower your cholesterol numbers like soluble fiber might, it is strongly linked to a lower risk of heart disease in the long run. This benefit may come from improved clotting factors or simply from the overall healthier lifestyle associated with high-fiber diets.

Specific gut bacterial species (Akkermansia muciniphila, Bacteroides faecis, Bifidobacterium longum, Faecalibacterium prausnitzii) are negatively correlated with insulin resistance and dyslipidemia markers in postmenopausal women with obesity, suggesting a probiotic potential for metabolic health.

Focus on dietary patterns that support beneficial gut bacteria, such as those high in fiber and non-meat proteins. The study suggests that species like Akkermansia muciniphila and Bifidobacterium longum are associated with better metabolic markers, and their abundance is influenced by diet. While this study is observational, it supports the idea that dietary choices directly shape a gut environment conducive to metabolic health.

Testosterone therapy in transgender men is associated with virilization (deepening voice, increased muscle mass, cessation of menses) and is considered safe regarding cardiovascular and oncological disease in the short- to mid-term.

Testosterone therapy for transgender men causes virilization, including voice deepening (which is permanent), increased muscle mass, facial/body hair growth, and cessation of menses. It is considered safe for cardiovascular and cancer risk in the short to mid-term, though long-term data is still being gathered.

Low-Glycemic Index (GI) diets promote greater weight loss, better insulin regulation, and lower weight regain compared to high-GI or conventional diets, primarily by enhancing satiety and minimizing postprandial insulin secretion.

Choose carbohydrates that digest slowly (low GI), such as vegetables, legumes, and whole grains, rather than refined grains and sugars. This helps control hunger and insulin levels, leading to better weight loss and maintenance.

Sprint performance is a multidimensional skill comprising distinct acceleration, transition, and maximum speed phases, each requiring specific muscle activation patterns and strength training adaptations.

Do not train like a bodybuilder. Focus on explosive power, speed-strength, and plyometrics. Heavy lifting should be limited and combined with sprint-specific exercises to avoid slowing down your contraction speed.

High cost and limited accessibility of fresh fruits and vegetables are primary barriers to consumption, particularly for low-income and minority populations.

If you are on a budget, prioritize fresh produce that has a longer shelf life or buy in bulk when on sale. Recognize that cost is a systemic barrier, not just a personal failure. Look for frozen vegetables as a cost-effective, nutrient-dense alternative to fresh when fresh is too expensive or spoils too quickly.

Early home food environment and familial habits strongly predict adult fruit and vegetable consumption patterns.

If you grew up in a household with low fruit and vegetable intake, recognize that your preferences are shaped by this early environment. You can retrain your palate by experimenting with different preparation methods (e.g., roasting vs. steaming) to find flavors you enjoy, rather than relying on raw or boiled options that may have been unappealing in your childhood.

Health knowledge and awareness of benefits do not automatically translate to increased fruit and vegetable consumption due to perceived barriers.

Knowing that fruits and vegetables are healthy is not enough to change your diet if you face financial or time constraints. Focus on practical strategies to overcome these barriers, such as meal planning, buying in bulk, or choosing frozen options, rather than just reading more health information.

Short-chain fatty acids (SCFAs), particularly butyrate, produced by gut bacteria, have protective effects against metabolic diseases by improving gut barrier function and reducing inflammation.

Increase intake of dietary fiber and prebiotics to boost butyrate-producing bacteria. This can improve gut barrier function, reduce inflammation, and support metabolic health.

Regulation of meals in schools and workplaces, including bans on vending machines and provision of healthy options, shows positive short-term effects on consumption but fails to account for compensating behavior outside the intervention setting.

School and workplace healthy food programs can help, but they are not a silver bullet. If people compensate by eating less healthy food elsewhere, the net benefit is lost. These programs work best when combined with broader environmental changes that make healthy choices easy everywhere, not just at school or work.

Prolonged intermittent fasting (e.g., during Ramadan) significantly decreases systemic inflammation, as measured by reduced IL-6 and CRP levels, without requiring weight loss.

Consider incorporating prolonged intermittent fasting (e.g., 16-24 hours) into your routine. This practice has been shown to significantly reduce inflammatory markers like IL-6 and CRP, independent of weight loss.

For female migrants, higher acculturation may be associated with lower BMI due to the adoption of Western body image ideals and increased physical activity, counteracting the obesogenic food environment.

If you are a female migrant, you may find that adopting some aspects of the host culture, such as prioritizing fitness and body image, can help you maintain a healthier weight despite the availability of unhealthy foods. This doesn't mean you have to abandon your heritage; it can be a complementary strategy for health.