Browse the evidence

Dietary patterns directly determine gut microbiota composition and metabolic output, with high-fiber/plant-rich diets promoting beneficial SCFA production and low-fat/high-fiber diets increasing Prevotella abundance, while Western diets (high fat/sugar/low fiber) shift the microbiome toward Firmicutes and reduce Bacteroidetes.

Your diet rapidly shapes your gut bacteria. Eating a plant-rich, high-fiber diet (like that of rural populations) promotes beneficial bacteria (Prevotella) and short-chain fatty acids (SCFA) that support gut health. Conversely, a Western diet high in fat and sugar shifts bacteria toward Firmicutes and reduces diversity. To improve your microbiome, prioritize diverse plant fibers and reduce processed fats and sugars, recognizing that your specific response may depend on your current microbial baseline.

Among dietary counseling interventions, those that combine diet and exercise result in statistically significantly greater weight loss during the active phase (first year) compared to diet alone, although this difference is not statistically significant during the maintenance phase.

If you want to maximize weight loss during the first year of a program, adding exercise to your dietary changes is more effective than diet alone. However, this advantage disappears once you stop the active program, so focus on sustainable habits for long-term maintenance.

Web-based interventions for weight loss maintenance are significantly more effective than control or minimal intervention groups in preventing weight regain.

To maintain weight loss, use a web-based program that offers ongoing support and monitoring. These programs are significantly more effective than doing nothing in preventing weight regain.

Achieving a modest weight loss of 5–10% of initial body weight is sufficient to obtain substantial health benefits and decrease comorbidities, making this a primary treatment goal rather than maximum weight loss.

Set a realistic goal of losing 5–10% of your current body weight. This modest amount is clinically proven to significantly reduce health risks like diabetes and heart disease. Focus on sustainable lifestyle changes rather than rapid, extreme weight loss, which often leads to regaining the weight.

Reducing waist circumference is a more important clinical indicator than weight loss per se because it directly correlates with decreased visceral fat and associated cardiometabolic risks.

Measure your waist circumference regularly in addition to weighing yourself. A reduction in waist size is a stronger indicator of improved health and reduced heart disease risk than weight loss alone, as it reflects the loss of dangerous visceral fat.

Early and intensive individualized nutrition counseling combined with oral supplements minimizes weight loss, preserves fat-free mass, and maintains quality of life in oncology outpatients receiving radiotherapy to the gastrointestinal or head and neck areas compared to usual care.

If you are undergoing radiotherapy for head, neck, or gastrointestinal cancer, do not rely solely on standard advice or supplements. Seek out a dietitian for intensive, individualized counseling starting early in your treatment. Regular weekly visits, followed by bi-weekly check-ins, help minimize weight loss, preserve muscle mass, and maintain your quality of life. The goal is to maintain your current weight, not necessarily to gain weight.

Administering a specialized high-protein oral nutritional supplement containing beta-hydroxy-beta-methylbutyrate (HP-HMB) to malnourished, older adults (≥65 years) hospitalized for acute medical conditions significantly reduces 90-day post-discharge mortality compared to placebo.

For older adults (65+) who are malnourished and hospitalized for heart or lung conditions, starting a high-protein supplement with HMB immediately upon admission and continuing it for 3 months after discharge can significantly lower the risk of death. This intervention is most effective when started early (within 72 hours) and continued post-discharge.

Real-time continuous glucose monitoring (CGM) significantly reduces the time spent in hypoglycemia (interstitial glucose <63 mg/dL) and lowers HbA1c in patients with type 1 diabetes compared to standard self-monitoring of blood glucose (SMBG).

If you have Type 1 Diabetes, using a real-time continuous glucose monitor (CGM) can significantly reduce the amount of time your blood sugar spends in dangerous low ranges compared to using standard finger-prick tests. This technology also helps lower your overall average blood sugar (HbA1c) without increasing the risk of hypoglycemia, which is a common trade-off with intensive insulin therapy. To get these benefits, you need to be committed to wearing the sensor continuously and adjusting your insulin based on the real-time data provided.

Pre-exercise ingestion of essential amino acids or protein, alone or combined with carbohydrates, maximally stimulates muscle protein synthesis and promotes greater strength gains compared to placebo or carbohydrate-only interventions.

If you lift weights, eat 20-35 grams of protein (or essential amino acids) mixed with carbohydrates about 30-60 minutes before your workout. This timing helps drive amino acids into your muscles while blood flow is high, stimulating protein synthesis during the exercise itself and leading to greater strength gains over time compared to just eating carbs or nothing.

Post-exercise ingestion of carbohydrates (8-10 g/kg/day) within 30 minutes maximizes muscle glycogen re-synthesis, and adding protein (0.2-0.5 g/kg/day) at a 3-4:1 ratio further enhances this re-synthesis.

After a hard workout, eat 8-10 grams of carbohydrates per kilogram of body weight within 30 minutes. If you can, add protein (0.2-0.5 g/kg) to create a 3:1 or 4:1 carb-to-protein ratio. This speeds up glycogen recovery, which is crucial if you train again soon.

Ingesting carbohydrates or carbohydrates combined with protein during resistance exercise offsets muscle glycogen decrements, reduces markers of muscle damage, and promotes greater training adaptations (strength and muscle cross-sectional area) compared to placebo.

If your resistance training session is long (over 40 minutes), consider drinking a carbohydrate solution (6% concentration) during the workout. This helps maintain your energy levels and reduces muscle damage, leading to better strength and muscle gains over time.

Regular physical activity or exercise reduces all-cause mortality by approximately 13% compared to control groups, with the magnitude of benefit being larger for patients with cardiovascular disease than for other populations.

To reduce your risk of death, aim for at least 150 minutes of moderate-intensity aerobic activity per week (or 75 minutes of vigorous activity). You do not need to do extreme amounts of exercise to see benefits; simply meeting these minimums significantly lowers mortality risk, especially if you have cardiovascular issues.

Physical activity improves Quality of Life (QOL), with the greatest improvements observed in patients with mental health conditions, followed by cardiovascular disease and cancer patients.

If you are managing a chronic condition, especially mental health issues, cardiovascular disease, or cancer, regular exercise can significantly improve your daily quality of life. Try to aim for longer sessions (over 90 minutes) if possible, as they may offer greater QOL benefits, but start with what you can tolerate.

Prescription omega-3 fatty acids (EPA+DHA or EPA-only) at a dose of 4 g/d reduce triglycerides by 30-35% in patients with very high triglycerides (≥500 mg/dL) and by approximately 27% in those with high triglycerides (200-499 mg/dL).

If you have high triglycerides, ask your doctor about prescription omega-3s (like Vascepa or Lovaza) taken at 4 grams per day. These are different from store-bought supplements because they are held to stricter FDA standards. They can lower your triglycerides by about 30%, but you should also focus on lifestyle changes like losing weight, limiting alcohol, and managing blood sugar.

Women metabolize zolpidem significantly slower than men, resulting in 50% higher serum levels and increased risk of next-day impairment, necessitating a halved recommended dosage for women.

If you are a woman prescribed zolpidem (Ambien), ensure your doctor prescribes the lower, FDA-recommended dose (typically 5mg). This is because your body clears the drug more slowly than men's, leading to higher levels in your blood and a higher risk of next-day drowsiness or impairment. Do not assume the standard male dose is appropriate for you.

Higher intake of total dietary fibre (specifically cereal and vegetable fibre) is associated with a significantly lower risk of developing type 2 diabetes, with a dose-response reduction of approximately 9% per 10 g/day increase.

To lower your risk of type 2 diabetes, increase your intake of total dietary fibre, with a specific focus on cereal and vegetable sources. Aim for an additional 10 grams of fibre per day, which is associated with a roughly 9% reduction in risk. Prioritize whole grains (like bread, pasta, and breakfast cereals) and vegetables over fruit for this specific benefit, as fruit fibre did not show the same protective association in this large-scale analysis. Note that much of this benefit appears to come from maintaining a healthy body weight.

Lifestyle modification focusing on weight loss and exercise is the primary effective therapy for reversing features of non-alcoholic steatohepatitis (NASH) and fibrosis.

Focus on sustainable weight loss and regular physical activity. Adopting a Mediterranean-style diet and increasing exercise are the most proven ways to reverse liver inflammation and fibrosis in NAFLD patients. This is the first-line treatment before considering medications.

Resistance exercise training (RET) significantly reduces depressive symptoms in adults, regardless of health status, total prescribed volume, or strength improvements.

Engage in resistance exercise training (RET) to reduce depressive symptoms. The specific volume, frequency, or intensity does not need to be optimized for strength gains, as the antidepressant effect is independent of these factors. Aim for a sustainable routine (e.g., 3 days/week) regardless of the total volume or whether you get stronger.

Substituting whole-grain products for refined-grain products significantly decreases the risk of developing type 2 diabetes mellitus in women.

To lower your risk of type 2 diabetes, replace refined grain products (like white bread, white rice, and regular pasta) with whole-grain alternatives (like whole-grain bread, brown rice, and oats). Aim for at least 2-3 servings of whole grains daily. This substitution works by slowing down digestion, which prevents sharp spikes in blood sugar and reduces the strain on your pancreas.

Increasing daily fruit and vegetable intake by three servings reduces the risk of all stroke (including transient ischemic attacks) by 22% in middle-aged men.

To lower your stroke risk, aim to eat three more servings of fruits and vegetables every day. This study of middle-aged men showed that this specific increase is linked to a 22% lower risk of stroke. You don't need to track specific nutrients; just focus on adding these food groups to your daily diet.

A 12-week home-based moderate-intensity physical activity intervention delivered via telephone counseling significantly increases total physical activity minutes, moderate-intensity activity, and fitness (walk test performance) in sedentary early-stage breast cancer survivors compared to a contact control group.

If you are a breast cancer survivor who is currently sedentary, you can start a home-based exercise program without needing a gym membership. Start with just 10 minutes of moderate activity (like brisk walking) twice a week. Use a pedometer and a log to track your progress. Over 12 weeks, gradually increase your activity to 30 minutes a day, 5 days a week. You can do this at home, and you can get support through weekly phone calls with a counselor who will help you set goals and overcome barriers. This approach has been shown to improve your fitness, energy levels, and mood.

Adherence to a Mediterranean diet, particularly when supplemented with extra-virgin olive oil or nuts, reduces the incidence of major cardiovascular events and breast cancer risk compared to a reduced-fat diet.

Adopt a Mediterranean-style eating pattern: emphasize fruits, vegetables, whole grains, fish, and healthy fats like olive oil and nuts. Limit red meat and saturated fats. This pattern is strongly linked to lower risks of heart disease and breast cancer.

Using step-counting pedometers as part of a behavioral intervention significantly increases daily physical activity (by approximately 2,000–2,500 steps/day) and leads to modest weight loss and blood pressure reduction in inactive adults.

If you are inactive, using a simple step counter and setting a daily goal (like 10,000 steps) can help you add about 2,000–2,500 steps to your day. This small increase is enough to lead to modest weight loss and lower blood pressure over a few months. Keep a log and use the device daily to stay motivated.

Beta-alanine is a more effective precursor than histidine for increasing muscle carnosine content and reducing fatigue during high-intensity exercise.

If your goal is to improve high-intensity exercise performance by increasing muscle carnosine, take beta-alanine (4.8–6.4 g/day) for at least 4 weeks. Taking histidine is less effective for this specific purpose.