Browse the evidence

Increasing leisure time physical activity in middle-aged men (ages 50-60) reduces total mortality to the level of those with consistently high activity, but this benefit is delayed by an induction period of approximately 10 years, during which mortality risk may transiently increase.

If you are a middle-aged man who has been inactive, starting a regular high-level physical activity program (like 3+ hours/week of sports or heavy gardening) will significantly lower your long-term mortality risk, bringing it in line with those who were always active. However, do not expect immediate results; there is a 10-year window where you might not see a mortality benefit and could even face a slightly higher short-term risk. Persistence through this decade is essential to reap the longevity benefits.

Higher levels of conscientiousness are associated with greater longevity and lower all-cause mortality risk.

Focus on building self-discipline and reliability. These traits are strongly linked to living longer, partly because they help you stick to healthy habits like not smoking and eating well. You can work on these traits over time.

A structured primary care exercise prescription program (Green Prescription) significantly increases moderate-to-vigorous physical activity levels and improves quality of life in inactive middle-aged and older women over two years, but does not significantly improve clinical biochemical markers (blood pressure, lipids, glycemic control) and is associated with a statistically significant increase in falls and injuries.

If you are a woman between 40 and 74 who isn't currently active, talk to your doctor about a 'Green Prescription.' This isn't just a piece of paper; it involves a nurse helping you set a goal of 30 minutes of brisk walking, five days a week. They will check in with you by phone and in person to keep you motivated. While this won't necessarily change your blood pressure or cholesterol numbers right away, it will likely help you feel better mentally and physically. Be aware that starting a new routine might slightly increase your risk of falls or minor injuries, so start slowly and focus on consistency.

A fixed-dose Cognitive Behavioral Therapy (CBT) protocol produces similar sleep improvements for patients with primary insomnia and those with comorbid psychiatric disorders.

If you suffer from chronic insomnia, whether it stands alone or is linked to other mental health conditions, a structured 8-week CBT program is a highly effective treatment. It involves learning to control your sleep environment, restricting time in bed to match your actual sleep, and changing unhelpful beliefs about sleep. This approach works just as well for people with comorbid psychiatric issues as it does for those with primary insomnia, offering a sustainable alternative to medication.

Actigraphy provides a valid, cost-effective, and less invasive alternative to polysomnography (PSG) for estimating sleep parameters in population-based epidemiological studies, with agreement rates of 91-93% in adults.

For tracking sleep in real-world settings, use an actigraphy device (wrist-worn accelerometer). It is a validated, non-invasive, and cost-effective method to estimate sleep duration and efficiency, especially when studying large groups or long-term patterns where lab-based PSG is impossible.

Sleep scoring algorithms (e.g., Cole-Kripke, UCSD, Sadeh) convert wrist movement data into sleep/wake scores using weighted activity counts, but these algorithms can misclassify quiet wakefulness as sleep, leading to inaccurate sleep onset latency estimates.

When using actigraphy, be aware that standard algorithms may mistake quiet wakefulness for sleep, potentially underestimating how long it takes to fall asleep (Sleep Onset Latency). For more accurate SOL, consider using sleep diaries or event markers to supplement the device data.

Using sleep diaries or event markers to define Time in Bed (TIB) and Sleep Period (SLP) significantly improves the accuracy of actigraphy-derived sleep parameters compared to using algorithm-defined boundaries alone.

To get the most accurate sleep data from your actigraphy device, use the event marker button or a sleep diary to log when you get in bed, turn off the lights, and get up. This helps the device distinguish between 'time in bed' and 'actual sleep time,' correcting for errors in sleep latency and efficiency calculations.

Eating disorders (anorexia and bulimia nervosa) are associated with amenorrhea, infertility, and increased risk of miscarriage, but fertility may normalize after recovery to a normal weight.

Eating disorders like anorexia and bulimia can cause amenorrhea and infertility. However, fertility often returns after recovery and weight restoration. Women with a history of eating disorders should be monitored closely during pregnancy due to increased risks of complications like pre-term birth and low birth weight. Postponing conception until remission is recommended.

Emotional eating mediates the relationship between depression and subsequent weight gain in adults, acting as a behavioral mechanism linking negative affect to obesity.

If you tend to eat more when stressed or depressed, recognize that this is a learned coping mechanism, not a character flaw. Focus on building alternative emotion regulation skills, such as mindfulness or cognitive behavioral techniques, to manage distress without turning to food.

Short sleep duration (≤7 hours) interacts with high emotional eating to significantly increase the risk of weight gain and BMI increase in adults.

If you are prone to emotional eating, prioritize getting at least 7-9 hours of sleep. Short sleep combined with emotional eating significantly increases your risk of weight gain. Improving sleep hygiene may help mitigate this risk.

For older men, total volume of physical activity (including light intensity) is the primary determinant of all-cause mortality reduction, whereas the pattern of accumulation (specifically meeting the 150-minute weekly guideline in bouts of ≥10 minutes) provides no additional mortality benefit.

If you are an older adult, you do not need to worry about finding uninterrupted 10-minute blocks of exercise to protect your heart and lifespan. The total amount of time you spend moving—whether it's light gardening, walking to the store, or short bursts of activity throughout the day—is what matters most. Focus on increasing your total daily movement volume rather than stressing over whether your activity is 'continuous' or 'bouted'.

The 7-day Physical Activity Recall (PAR) questionnaire provides group-accurate estimates of PAEE comparable to DLW, but fails to accurately estimate absolute PAEE for individuals, overestimating low activity and underestimating high activity.

Use self-reported activity logs to gauge general trends, not precise calorie counts. Be aware that you likely overestimate your effort when you are less active and underestimate it when you are highly active. For precise energy balance tracking, self-report is insufficient.

Quitting smoking is independently associated with significantly higher odds of gaining >5 kg over 5 years (OR ~2.94) compared to never smokers, even after adjusting for physical activity, sitting time, and energy intake.

If you are a midage woman planning to quit smoking, be aware that you are at higher risk for significant weight gain (approx 5 kg over 5 years). Proactively manage this by making small, sustained increases in physical activity and decreases in sitting time, as energy intake adjustments alone may not be sufficient for all.

Dietary trends in France are strongly age-stratified, with young adults adopting a 'snacking and convenience' diet (more rice, pasta, meat, less eggs/fish) while the elderly maintain a 'traditional' diet (more bread, potatoes, cheese).

Tailor your nutrition strategy to your age group. If you are young, prioritize convenient, nutrient-dense options like rice, pasta, and lean meats. If you are older, leverage your preference for traditional foods like bread, potatoes, and cheese, but monitor dairy intake if necessary.

Dietary restriction and attempted food deprivation increase the frequency and intensity of food cravings, whereas fasting generally suppresses them.

Do not assume that craving means you are nutritionally deficient. If you are restricting foods, expect cravings to increase due to psychological factors like thought suppression and cue reactivity. This is a normal psychological response to restriction, not a biological signal. To manage it, focus on the psychological triggers (mood, cues) rather than just the food itself, and consider that fasting may actually suppress cravings while partial restriction increases them.

Thought suppression and cognitive load increase the accessibility and salience of forbidden foods, leading to ironic rebound effects on craving and consumption.

Do not rely on thought suppression to manage cravings. Trying to force yourself not to think about a forbidden food often makes it more salient. Instead, use techniques that interfere with the vividness of food imagery, such as staring at dynamic visual noise, to reduce the intensity of the craving.

Food cravings are strongly associated with negative mood states (boredom, anxiety, dysphoria) and are often used as a mechanism for emotional regulation.

Recognize that cravings are often triggered by negative emotions like boredom or anxiety, not just hunger. If you are feeling down, the craving may be a coping mechanism. Addressing the emotional state directly, rather than just resisting the food, may reduce the intensity of the craving.

Behavior-based interventions targeting diet and/or physical activity are effective in reducing gestational weight gain, although effectiveness varies significantly based on intervention design and sample characteristics.

To reduce excessive weight gain during pregnancy, focus on specific, actionable behavior changes (like adding one fruit serving daily or specific activity goals) rather than just monitoring your weight or receiving vague 'eat healthy' advice. Interventions are most effective when they use theory-based behavior change techniques and are tailored to the individual, especially if you were overweight before pregnancy.

Urbanization is positively associated with higher Body Mass Index (BMI) across countries, independent of national income and Western diet, suggesting that urban living environments drive obesity through mechanisms like physical inactivity.

Living in a city often means a more sedentary lifestyle due to job types and transportation. To counteract this, you must consciously integrate physical activity into your daily routine, as the urban environment itself may not provide enough movement.

Sleep disturbance is an independent predictor of increased disability, physical symptoms, and reduced daily uptime in chronic pain patients, challenging the view that sleep issues are merely a consequence of pain.

If you have chronic pain, your sleep quality is likely driving your daily disability and fatigue as much as, or more than, the pain itself. Prioritizing sleep restoration is not just about rest; it is a critical functional intervention that can reduce physical symptoms and improve daily uptime, independent of pain levels.

Vigorous physical activity, defined as exercising to the point of breaking a sweat at least 1 to 3 times per month, significantly reduces the risk of heart failure in men.

To lower your heart failure risk, you do not need to exercise daily. Engaging in vigorous activity that makes you sweat, even just 1 to 3 times a month, is associated with a significant reduction in risk compared to being inactive. Consistency in intensity (vigorous) matters more than high frequency for this specific benefit.

An 8-week Internet-delivered psychoeducational intervention (Student Bodies) significantly reduces body dissatisfaction and disordered eating attitudes in high-risk college women compared to a wait-list control.

If you are a college student concerned about body image, an 8-week online program involving weekly readings, cognitive exercises, and moderated discussion groups can significantly reduce body dissatisfaction and disordered eating attitudes. The program requires active participation, including posting in discussion groups and attending a few face-to-face sessions, but offers a structured, evidence-based approach to improving body satisfaction.

Adolescent males who are inactive are at high risk of remaining inactive in young adulthood, whereas inactive adolescent females tend to increase their activity levels.

If you are a young man who is currently inactive, do not assume your activity level is fixed. The data shows that inactive adolescent males are the specific subgroup most likely to remain inactive in adulthood. This is not a life sentence, but it is a strong statistical signal that you need to intervene now, as the window to establish active habits is closing faster for you than for your female peers.

Engaging in multiple specific types of physical activity during adolescence is moderately associated with higher global physical activity levels in young adulthood, whereas participation in single specific sports has weak associations.

Encourage young people to try multiple sports and activities rather than specializing in just one. While specializing in one sport doesn't hurt, doing a variety of activities (e.g., hiking, cycling, ball games) creates a stronger, more flexible habit of physical activity that is more likely to persist into adulthood.