Browse the evidence

Probiotics significantly reduce the incidence of antibiotic-associated diarrhea (AAD) and Clostridium difficile disease (CDD) when specific strains (S. boulardii, L. rhamnosus GG) are used.

If you are prescribed antibiotics, ask your doctor about taking Saccharomyces boulardii or Lactobacillus rhamnosus GG to prevent diarrhea. These specific strains are proven to help, but other probiotics may not work for this purpose.

Dietary fiber fermentation by gut microbiota produces short-chain fatty acids (SCFAs) which stimulate the secretion of gut peptides (GLP-1, PYY) via GPR41/GPR43 receptors, thereby improving glucose regulation and reducing energy intake.

To leverage your gut microbiome for better blood sugar control and appetite regulation, consume complex carbohydrates (dietary fibers) that resist digestion in the small intestine. These fibers reach the colon where bacteria ferment them into short-chain fatty acids (SCFAs). These SCFAs activate specific receptors (GPR41/43) on gut cells, triggering the release of hormones like GLP-1 and PYY that improve glucose handling and reduce hunger. Focus on sources like resistant starches and arabinoxylans.

Chronic low-grade inflammation is a causative mechanism for insulin resistance and metabolic disease in obesity, rather than merely a consequence.

If you are overweight, your body may be in a state of chronic, low-grade inflammation that actively interferes with how your cells respond to insulin. This isn't just 'being fat'; it's a biological shift that promotes metabolic disease. Addressing this requires looking beyond simple calorie counting to strategies that may reduce this inflammatory burden, such as improving diet quality and managing stress, as the inflammation itself drives insulin resistance.

Subcutaneous semaglutide at 0.4 mg daily significantly improves histologic resolution of NASH without worsening fibrosis in patients with stage F2 or F3 fibrosis compared to placebo.

For patients with NASH and fibrosis stages F2 or F3, treatment with 0.4 mg of subcutaneous semaglutide daily for 72 weeks significantly increases the likelihood of NASH resolution without worsening fibrosis compared to placebo. This benefit comes with a higher risk of gastrointestinal side effects, particularly nausea, which often diminishes over time. Patients should be counseled on nutrition and physical activity alongside this treatment.

Sleep disruption (fragmentation/continuity loss) causes increased sympathetic nervous system activity and HPA axis activation, leading to short-term stress responsivity and long-term cardiovascular disease risk.

Prioritize sleep continuity, not just duration. If you wake up frequently, your body experiences a stress response similar to being awake, increasing long-term risks for heart disease and high blood pressure. Focus on strategies to maintain uninterrupted sleep, such as managing environmental factors (light/noise) and addressing underlying sleep disorders like apnea.

Sleep disruption leads to metabolic dysregulation (decreased insulin sensitivity, altered leptin/ghrelin) increasing the risk of obesity, metabolic syndrome, and type 2 diabetes.

Poor sleep disrupts the hormones that control hunger (ghrelin increases, leptin decreases) and reduces your body's ability to use insulin. This makes you more likely to gain weight and develop type 2 diabetes, even if your diet and exercise habits haven't changed. Fixing sleep continuity is a key metabolic intervention.

Lachnospiraceae taxa, particularly Blautia and Roseburia, play a protective role in maintaining gut barrier integrity and immune regulation through the production of butyrate and other SCFAs in healthy states.

In a healthy state, Lachnospiraceae are beneficial allies. They produce butyrate, which fuels your gut cells and reduces inflammation. To support this, consume a diverse diet rich in fibers that these bacteria can ferment, such as fruits, vegetables, and whole grains, while avoiding excessive processed foods that might disrupt this balance.

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.

Combined oral contraceptive pills (COCP) are the first-line pharmacological management for menstrual irregularity and hyperandrogenism in women with PCOS.

If you have irregular periods or signs of high androgens (like hirsutism), combined oral contraceptives are the recommended first medication. Low-dose versions are preferred.

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.

SGLT2 inhibitors (e.g., Canagliflozin, Dapagliflozin, Empagliflozin) lower blood glucose through an insulin-independent mechanism by blocking glucose reabsorption in the kidneys, providing modest weight loss and blood pressure reduction.

SGLT2 inhibitors are oral medications that help your kidneys remove sugar from your body through urine. This lowers blood sugar without relying on insulin, making them useful even in advanced diabetes. They also help with weight and blood pressure. Watch for signs of urinary or genital infections.

Prolonged sleep deficiency (short duration or disturbance) causes chronic, systemic low-grade inflammation, which is associated with increased risk of inflammatory diseases such as diabetes, atherosclerosis, and neurodegeneration.

Prioritize consistent, sufficient sleep duration and quality. Chronic sleep loss is not just about feeling tired; it actively drives systemic inflammation, increasing your risk for diabetes, heart disease, and neurodegeneration. Treat sleep as a non-negotiable pillar of immune health, equal in importance to nutrition and exercise.

Adequate sleep enhances host defense by improving infection outcomes and vaccination responses, mediated by the induction of a hormonal constellation that supports immune functions.

Ensure you get adequate sleep, especially around the time of vaccination or when you suspect an infection. Sleep actively boosts your immune response, improving vaccine efficacy and helping your body fight off pathogens more effectively. Prioritizing sleep is a proactive strategy for immune resilience.

Reduced muscle mass is a critical phenotypic criterion for malnutrition, measurable via body composition techniques (DXA, BIA, CT) or anthropometrics (calf/arm circumference) when advanced tools are unavailable.

Check muscle mass, not just weight. Use simple measurements like calf or arm circumference if you don't have advanced body composition tools. Low muscle mass is a key sign of malnutrition.

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.

Supplementation with EPA and DHA (2.7 g/day EPA) reduces the production of pro-inflammatory eicosanoids (like PGE2) and cytokines (TNF-alpha, IL-1beta) by altering cell membrane phospholipid composition and inhibiting NF-kB activation.

To reduce inflammation, standard fish oil doses may be insufficient. Research suggests a threshold of approximately 2.7 grams of EPA per day is needed to significantly lower inflammatory markers like PGE2. This is higher than typical dietary intake. For conditions like RA, this dosage has shown clinical benefits like reduced stiffness and pain.

Adequate intake of specific micronutrients (Vitamins A, D, C, E, B6, B12, folate, zinc, iron, copper, selenium) is essential for maintaining the structural and functional integrity of the immune system, and marginal deficiency impairs immunity.

Ensure your diet provides adequate levels of key immune-supporting micronutrients (Vitamins A, D, C, E, B6, B12, folate, zinc, iron, copper, selenium). If you have increased requirements due to stress, infection, or pollution, or if your diet is lacking, consider supplementation as these nutrients play vital roles in immune function.

High-volume, intense exercise training and competition are associated with transient immune dysfunction and an increased risk of upper respiratory tract infections (URTI).

If you are training for a marathon or competing in endurance events, be aware that your risk of getting sick spikes in the days following the event. Prioritize recovery, sleep, and nutrition immediately after heavy exertion to mitigate this risk.

Obesity is primarily driven by long-term energy imbalance (calories consumed vs. expended), though food quality and source significantly modulate this relationship.

While energy balance is the fundamental driver of obesity, focusing exclusively on calorie counting may be less effective than prioritizing the quality and source of your food. The paper suggests that what you eat (food sources and nutrient quality) matters more than just how much you eat for controlling weight and preventing disease. Consider shifting your focus from strict calorie restriction to improving the nutritional quality of your diet.

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.