Browse the evidence

High adherence to a Mediterranean diet is associated with increased fecal SCFAs and Prevotella abundance, while low adherence is linked to elevated urinary TMAO and increased cardiovascular risk.

Adopting a Mediterranean-style diet—rich in fiber, polyphenols, and unsaturated fats—supports beneficial bacteria (Prevotella) and reduces harmful metabolites (TMAO). This pattern is linked to lower cardiovascular risk and reduced inflammation.

Increased exposure to greenspace is associated with statistically significant reductions in physiological stress markers (salivary cortisol, heart rate, blood pressure) and all-cause mortality.

Prioritize spending time in green spaces (parks, forests, tree-lined streets) as a health intervention. This is not just about leisure; it is associated with measurable reductions in stress hormones, blood pressure, and long-term mortality risk. If you live in a deprived area, advocate for or seek out accessible green spaces, as the health benefits may be even stronger for those groups.

Increased greenspace exposure is associated with a reduced incidence of specific chronic diseases, including Type II diabetes, cardiovascular mortality, and stroke.

Living in or frequently visiting areas with higher greenness is associated with a lower risk of developing Type II diabetes and cardiovascular mortality. This suggests that environmental factors play a role in chronic disease prevention, independent of individual lifestyle choices alone.

Population-level interventions, specifically lowering sodium in packaged foods and increasing fruit/vegetable availability, effectively reduce blood pressure across entire populations.

Advocate for or support policies that reduce sodium in processed foods and make fresh produce more affordable and accessible in your community. Individual effort is often insufficient without these environmental supports.

Short-chain fatty acids (SCFAs), particularly butyrate, acetate, and propionate, produced by gut microbiota fermentation of dietary carbohydrates, provide significant caloric energy to the host and exert anti-inflammatory effects by promoting intestinal epithelial integrity and inducing regulatory T cells.

Prioritize dietary fibers and complex carbohydrates that reach the colon, as these are fermented by gut bacteria into short-chain fatty acids (SCFAs) like butyrate. These SCFAs are not just waste products; they provide about 10% of your body's energy needs, strengthen your gut lining, and help regulate inflammation. A diverse diet rich in fibers supports this beneficial microbial activity.

Excessive protein fermentation by gut microbiota can produce toxic metabolites such as hydrogen sulfide, ammonia, and certain amines, which may damage the intestinal epithelium, promote inflammation, and are associated with diseases like inflammatory bowel disease (IBD).

Be mindful that very high protein intakes, especially without adequate fiber, may lead to the production of potentially harmful byproducts like hydrogen sulfide and ammonia by gut bacteria. This is particularly relevant for individuals with gut sensitivities or inflammatory conditions. Balancing protein intake with fiber-rich foods can help maintain a healthier microbial balance.

Resistance training has particularly pronounced effects on executive function, memory, and working memory in older adults.

Incorporate strength training into your routine to boost memory and decision-making skills. You don't need heavy weights; bodyweight exercises or light machines work. Focus on consistency. This is especially important for keeping your mind sharp as you age.

Glutamine is a conditionally essential amino acid that serves as a primary fuel source for immune cells (lymphocytes, macrophages, neutrophils) and gut enterocytes, particularly during catabolic stress, sepsis, or intense exercise, where endogenous synthesis cannot meet demand.

If you are critically ill, recovering from major surgery, or suffering from severe sepsis, your body's demand for glutamine exceeds what it can produce. In these specific catabolic states, glutamine supplementation is often recommended to support immune cell function and gut integrity. For healthy, non-stressed individuals, endogenous production is usually sufficient, and the necessity of supplementation is less clear.

High consumption of ultra-processed foods (UPFs) is a primary driver of the global nutrition transition, leading to increased risks of obesity, type 2 diabetes, and cardiovascular disease due to their role as vectors for excessive intake of added sugars, sodium, and trans-fats.

Reduce intake of ultra-processed foods (UPFs) by focusing on whole or minimally processed foods. UPFs are characterized by industrial formulations with cosmetic additives, high sugar, sodium, and unhealthy fats. Prioritize foods that do not require extensive industrial processing to improve long-term metabolic health and reduce disease risk.

A Western diet high in animal protein, choline, and saturated fat promotes a specific gut microbiome profile (Enterotype 1) characterized by high Bacteroides and low Prevotella, which is associated with increased risk of metabolic diseases.

Adopting a plant-rich diet can shift your gut microbiome away from the 'Western' profile (high Bacteroides, low Prevotella) toward one associated with better metabolic health and higher microbial diversity.

Akkermansia muciniphila supplementation or enrichment improves insulin sensitivity, reduces body weight, and counteracts diet-induced metabolic syndrome in obese or insulin-resistant individuals.

Consider strategies to enrich Akkermansia muciniphila, such as consuming prebiotics like fructooligosaccharides (FOS) or exploring supplementation, to potentially improve insulin sensitivity and manage weight.

Intestinal barrier disruption (leaky gut) allows translocation of bacterial endotoxins like LPS into circulation, driving systemic low-grade inflammation and contributing to metabolic and autoimmune diseases.

Maintaining gut barrier integrity through a diverse, fiber-rich diet supports the production of short-chain fatty acids (SCFAs) and healthy microbiota, which are critical for preventing the translocation of inflammatory bacterial components like LPS. This is a foundational aspect of metabolic and immune health, not just digestive comfort.

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.

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.

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.

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.

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.

Higher relative abundance of the gut bacterial family Christensenellaceae is robustly associated with lower body mass index (BMI), reduced visceral adiposity, and improved metabolic health markers (lower triglycerides, higher HDL).

Focus on dietary patterns that support Christensenellaceae: consume adequate fiber (resistant starch, galacto-oligosaccharides) and protein. While you cannot change your genetics, these dietary inputs can increase the relative abundance of this bacteria, which is associated with healthier body composition and metabolic markers. Do not expect a probiotic supplement to replace diet and exercise, as the mechanism is not fully understood and the bacteria are complex to culture.

Non-alcoholic fatty liver disease (NAFLD) is independently associated with a significantly increased risk of major cardiovascular disease (CVD) events, including fatal and non-fatal outcomes, with risk magnitude increasing with the severity of liver fibrosis.

If you have been diagnosed with NAFLD, you must undergo regular cardiovascular screening, regardless of your cholesterol or blood pressure levels. The presence of fatty liver, especially if fibrosis is present, independently increases your risk of heart attacks and stroke. Aggressive management of cardiometabolic risk factors is essential.