Browse the evidence

Optimizing health outcomes in adults requires integrating sleep, sedentary behavior, and physical activity across the entire 24-hour day, as changes in one behavior affect the time available for others.

Stop viewing exercise in isolation. Your health depends on how you spend your entire day. Prioritize getting enough sleep, break up long periods of sitting, and include physical activity. If you sleep less, try to be more active or less sedentary to compensate, but recognize that all three components matter.

A self-regulation program emphasizing daily self-weighing and behavioral adjustment significantly reduces the risk of regaining 2.3 kg or more over 18 months compared to standard newsletters, with face-to-face delivery being superior to internet delivery for minimizing total weight regain.

To maintain weight loss, you must actively monitor your weight daily and adjust your diet or exercise if you gain more than 1.4 kg. Use a self-regulation system: stay in the 'green zone' (maintain), solve problems in the 'yellow zone' (1.4-2.2 kg gain), and restart active weight loss efforts if you enter the 'red zone' (>=2.3 kg gain). Face-to-face support is more effective than internet-only support for minimizing total weight regain, but both are superior to doing nothing.

Regular exercise (specifically thrice-weekly moderate-intensity aerobic activity and twice-weekly resistance training) improves cancer-related health outcomes including fatigue, anxiety, depression, quality of life, and physical function, and does not exacerbate lymphedema.

If you have cancer or are a survivor, ask your oncologist about exercise. They can refer you to a program. The recommended dose is 30 minutes of moderate aerobic activity 3 times a week and resistance training 2 times a week. This improves fatigue, mood, and function, and is safe even if you have lymphedema.

Sarcopenia should be screened using the SARC-F questionnaire and formally diagnosed using grip strength or chair stand tests combined with DXA measurement of muscle mass.

Healthcare providers should screen older patients for muscle loss using the SARC-F questionnaire. If positive, confirm the diagnosis with a grip strength test or chair stand test and a DXA scan to measure muscle mass.

Engaging in leisure-time physical activity of moderate to vigorous intensity (0.1–3.74 MET-h/wk, equivalent to up to 75 minutes of brisk walking per week) is associated with a 1.8-year gain in life expectancy after age 40 compared to no leisure-time activity.

If you currently do no leisure-time exercise, start by aiming for just 75 minutes of brisk walking per week. This low threshold is associated with gaining 1.8 years of life expectancy after age 40 compared to being completely inactive. You do not need to exercise for hours to see significant longevity benefits; consistency at a low intensity is highly effective.

Higher levels of leisure-time physical activity (up to 22.5+ MET-h/wk, equivalent to 450+ minutes of brisk walking per week) are associated with greater gains in life expectancy (4.5 years) compared to no activity, with diminishing returns at the highest levels.

If you are already active, increasing your weekly brisk walking time to 450 minutes (7.5 hours) can add up to 4.5 years to your life expectancy compared to being inactive. While the biggest gains come from starting to move, continuing to increase your activity volume provides additional longevity benefits, even if the rate of gain slows at very high levels.

Adherence to a combination of five low-risk lifestyle factors (never smoking, BMI 18.5-24.9, moderate-to-vigorous physical activity ≥30 min/day, moderate alcohol intake, and high diet quality) significantly increases life expectancy free of cancer, cardiovascular disease, and type 2 diabetes.

To maximize your disease-free years, focus on five key areas: never smoke, maintain a BMI between 18.5 and 24.9, engage in at least 30 minutes of moderate-to-vigorous physical activity daily, consume alcohol moderately (if at all), and eat a high-quality diet (top 40% of the Alternate Healthy Eating Index). Adhering to four or five of these factors can add approximately 10 years to your life expectancy free of major chronic diseases compared to having none.

Lifelong physical activity prevents the age-related decline in cardiorespiratory fitness (VO2max), maintaining fitness levels comparable to individuals four decades younger and significantly reducing mortality risk.

To maintain your heart health and longevity, you must keep doing aerobic exercise throughout your life. Don't stop when you hit middle age; consistent training keeps your fitness level comparable to someone much younger and cuts your risk of early death significantly.

Physical inactivity is a direct cause of 40 chronic diseases and premature death, while physical activity prevents or treats these conditions.

Sitting is a major risk factor for chronic disease. To prevent conditions like type 2 diabetes and heart disease, you must incorporate regular physical activity into your life, as inactivity directly contributes to these illnesses.

Adherence to ideal combined lifestyle behaviors (smoking, BMI, physical activity, diet) significantly reduces the risk of incident cardiovascular disease and type 2 diabetes, regardless of an individual's genetic risk score.

Focus on the four pillars: don't smoke, keep your weight in a healthy range, eat a diet rich in key components, and stay physically active. Doing this well significantly lowers your risk of heart disease and diabetes, even if you have a high genetic predisposition. Your lifestyle choices matter just as much for high-risk individuals as they do for low-risk ones.

High amounts of sedentary behavior increase the risk of all-cause mortality, cardiovascular disease (CVD) mortality, and incident type 2 diabetes, with evidence graded as strong for these associations.

Sitting for long periods increases your risk of dying early and developing heart disease or diabetes, even if you exercise. To protect your health, try to break up long periods of sitting with light movement throughout the day, in addition to your regular exercise routine.

High adherence to behavioral self-monitoring (specifically daily food-intake record-keeping) significantly enhances weight loss outcomes in patients receiving combined pharmacotherapy and lifestyle modification.

If you are on a weight-loss medication, you must keep daily records of what you eat. The study shows that patients who tracked their food frequently lost more than twice as much weight (18 kg) as those who tracked infrequently (7.7 kg). This behavioral step is critical for maximizing results.

Internet-delivered cognitive-behavioral therapy for insomnia (eCBT-I) significantly improves insomnia severity, sleep efficiency, and sleep onset latency compared to control groups, with effect sizes comparable to face-to-face CBT-I.

If you struggle with insomnia, internet-delivered CBT-I (eCBT-I) is a viable, evidence-based treatment option. It delivers the same core techniques as face-to-face therapy (like sleep restriction and cognitive restructuring) online. You can expect significant improvements in sleep quality and duration, comparable to seeing a therapist in person. Look for programs that offer some level of clinical support if you need extra guidance, but even automated programs can be effective.

Strength training adaptations are driven by neural factors early on, and muscle hypertrophy requires reaching muscular failure regardless of load, though high loads are needed for maximal strength gains.

To build muscle, you don't necessarily need to lift heavy weights. As long as you train close to muscular failure, lighter weights can build muscle just as effectively. However, if your goal is maximal strength, you still need to lift heavy loads.

The risk reduction from lifestyle interventions for type 2 diabetes prevention is sustained for many years (up to 20 years) after the active intervention phase.

The effort you put into lifestyle changes now continues to protect you from type 2 diabetes for many years, even after you stop actively tracking your diet and exercise. The benefits do not disappear when the 'program' ends.

Medical Nutrition Therapy (MNT) provided by a registered dietitian significantly improves glycemic control (HbA1c) and metabolic outcomes in patients with type 1 and type 2 diabetes, with the greatest benefit observed at initial diagnosis.

If you have diabetes, working with a registered dietitian for Medical Nutrition Therapy (MNT) is a proven way to lower your blood sugar (HbA1c). This isn't just generic advice; it involves a personalized plan, regular check-ins, and adjustments based on your results. Starting MNT early, especially after diagnosis, yields the best results, but it helps at any stage. It can even reduce your need for medication.

Intensive lifestyle intervention is cost-effective for preventing type 2 diabetes in high-risk adults over a 10-year horizon, yielding approximately $10,037 per QALY gained compared to placebo.

For high-risk individuals, committing to a structured lifestyle program involving 150 minutes of moderate exercise weekly and a 7% weight loss goal is a financially sound long-term investment. While the initial cost is higher than medication, the prevention of diabetes and associated medical costs makes it a valuable use of resources over 10 years.

Weighed food records are the most accurate method for assessing habitual dietary intake, significantly outperforming 24-hour recalls, food-frequency questionnaires, and estimated food records, although underreporting occurs in approximately 20% of overweight individuals.

If you need to know exactly what you are eating for health or performance reasons, use weighed food records. While other methods like food frequency questionnaires are easier, they are significantly less accurate. Be aware that overweight individuals tend to underreport their intake, so double-check your records against biological markers if possible.

Resistance exercise training effectively increases muscle mass and strength in the elderly, even in the presence of anabolic resistance, provided protein is ingested around the exercise.

Do resistance training regularly. It works for building muscle and strength even when you are old. To maximize results, eat protein (especially leucine-rich sources) around your workout sessions.

Lifestyle modification (LSM) interventions significantly reduce diabetes incidence in adults at risk, and unlike medications, these effects are sustained for several years after the active intervention ends, although the magnitude of benefit declines over time.

Adopting combined diet and physical activity changes is the most effective long-term strategy for preventing diabetes in at-risk adults. While the protective effect diminishes slightly over many years, it remains significant (28% risk reduction) long after active counseling ends. To maximize longevity, focus on sustainable habits rather than short-term intensity, as the physiological benefits of weight loss and improved insulin sensitivity persist.

Laparoscopic Roux-en-Y Gastric Bypass (LGBP) induces a significant dietary shift towards lower fat intake and higher carbohydrate intake compared to Laparoscopic Vertical Banded Gastroplasty (LVBG), with approximately 30% of LGBP patients consciously avoiding fatty foods.

After LGBP surgery, patients naturally tend to reduce their fat intake, with about 30% consciously avoiding fatty foods due to post-meal discomfort. This behavioral shift contributes to the effectiveness of the surgery by reducing overall caloric density.

Real-time remotely monitored exercise-based cardiac telerehabilitation (REMOTE-CR) is non-inferior to traditional centre-based cardiac rehabilitation in improving maximal oxygen uptake (VO2max) in adults with coronary heart disease.

If you have heart disease, you can get effective cardiac rehab at home using a remote monitoring system. It involves 3 sessions a week for 12 weeks, where you exercise while wearing a sensor that sends your heart data to a specialist who coaches you in real-time. This approach is just as good for improving your fitness (VO2max) as going to a clinic, and it saves money and travel time.

App-based mobile interventions significantly improve nutrition behaviors and nutrition-related health outcomes, including obesity indices, blood pressure, and blood lipids, with small-to-medium effect sizes.

Use a mobile app that tracks your food and provides feedback. Look for apps that use behavior change techniques like setting goals and providing social support. This approach has been shown to improve your diet and health markers like blood pressure and weight, even if the changes are gradual.

Cognitive-behavioral therapy for insomnia (CBT-I) is the first-line treatment for insomnia disorder, with hypnotics recommended only for short-term use when CBT-I is unavailable or ineffective.

If you have chronic insomnia, seek Cognitive-Behavioral Therapy for Insomnia (CBT-I) as your primary treatment. It is the gold standard recommended by all major medical guidelines. Use sleep medications only as a short-term bridge if CBT-I is not accessible, not as a long-term solution.