Browse the evidence

Secular trends in the UK indicate that younger birth cohorts (born after the 1980s) develop overweight or obesity at significantly younger ages and with higher probabilities than older cohorts (born before the 1980s).

If you are raising children in a modern high-income environment, expect a higher baseline risk of overweight/obesity compared to previous generations. The data suggests this risk manifests earlier (childhood/adolescence) rather than just in adulthood. Focus on early-life environmental factors (diet, activity) as the primary lever for prevention, as the 'normal' trajectory has shifted.

Maximal oxygen uptake (VO2max) and maximal heart rate decline with age at rates of approximately 3.5 mL/kg/min and 6 beats/min per decade, respectively, starting from peak values in the 20-29 age group.

Your fitness naturally declines as you age, but you can slow this down. Focus on maintaining physical activity, especially if you are a woman over 50, as activity levels have a stronger impact on your VO2max than on men in the same age bracket. Don't rely on the '220 minus age' rule for heart rate; it overestimates the decline.

Women have significantly lower absolute and relative VO2max compared to men, but the Borg scale of perceived exertion provides a valid estimate of relative intensity for both sexes, with minor sex differences at lower intensities.

Use the Borg scale (6-20) to gauge your effort; it is a reliable tool for both men and women. However, if you are a woman, you might perceive low-intensity exercise as slightly harder than a man doing the same absolute work. Adjust your perception accordingly, but trust the scale for moderate-to-high intensities.

Mitochondrial impairment accelerates epigenetic aging, while enhancing mitochondrial biogenesis slows it, establishing a direct link between mitochondrial function and the rate of epigenetic aging.

Mitochondrial health is a key driver of epigenetic aging. Impairing mitochondria accelerates the epigenetic clock, while boosting mitochondrial biogenesis slows it. This suggests that interventions supporting mitochondrial function (like exercise or specific nutrients) may slow epigenetic aging, independent of DNA repair or telomere length.

Women with diabetes face a 58% greater risk of coronary heart disease (CHD) mortality and a 13% greater risk of all-cause mortality compared to men with diabetes, indicating a significant sex-specific disparity in cardiovascular outcomes.

If you are a woman with diabetes, your risk of dying from heart disease is significantly higher than a man with diabetes. This means you should not just manage your blood sugar, but actively prioritize cardiovascular health with your doctor, potentially requiring more aggressive monitoring or prevention strategies than standard male-centric guidelines might suggest.

Higher baseline insulin secretion is a key biological predictor of regression from pre-diabetes to normal glucose regulation, suggesting that preserving beta-cell function is critical for reversal.

Your body's ability to produce insulin is crucial for reversing pre-diabetes. The study found that people with higher insulin secretion were more likely to return to normal glucose levels. While you can't directly 'dose' insulin secretion, lifestyle interventions (diet and exercise) help preserve this function. This is particularly important for older adults, as age-related decline in insulin secretion can impede reversal. Focus on lifestyle changes to support your beta-cells.

Younger age is a significant predictor of regression from pre-diabetes to normal glucose regulation, likely due to better preserved insulin secretion and sensitivity.

Younger age is associated with a higher likelihood of reversing pre-diabetes, largely because younger people tend to have better insulin secretion and sensitivity. However, this does not mean older adults cannot benefit. Lifestyle interventions (diet and exercise) are still effective for older adults, though they may need to work harder to overcome age-related biological declines. The best strategy is to establish healthy habits early.

Skeletal muscle is a key metabolic tissue responsible for ~80% of postprandial glucose disposal, and its circadian disruption contributes to insulin resistance and metabolic syndrome.

Prioritize muscle-building activities and regular physical activity to improve your body's ability to handle glucose after meals. Since muscles handle most of your post-meal sugar, stronger muscles can help prevent insulin resistance and type 2 diabetes.

Visceral adipose tissue (VAT) and epicardial adipose tissue (EAT) accumulation is a primary driver of cardiovascular injury in obesity and diabetes, independent of overall body mass index (BMI), through the release of pro-inflammatory factors and free fatty acids.

For individuals with obesity or Type-2 Diabetes, focusing solely on BMI is insufficient for assessing heart disease risk. Visceral and epicardial fat are more dangerous indicators. Reducing these specific fat depots through lifestyle changes or medication is crucial for preventing heart failure and other cardiovascular injuries.

The doubly labelled water (DLW) method is the gold standard for measuring total energy expenditure in free-living humans because it accurately captures activity energy expenditure without interfering with subject behavior.

If you need to know your true energy expenditure in daily life, self-reports and most wearables are unreliable. The doubly labelled water method is the only validated way to measure this accurately without restricting your normal activities, though it is primarily a research tool due to cost and complexity.

Moderate or non-excessive alcohol consumption, along with above-median fruit and vegetable intake, are key components driving the mortality-reducing association of the Mediterranean Diet.

To maximize longevity benefits, prioritize high intake of fruits and vegetables, include moderate alcohol if you already drink, and limit meat intake, as higher meat consumption was associated with increased mortality risk in this analysis.

Metformin administration (1,700 mg/day) blunts gains in lean body mass and thigh muscle mass in older adults undergoing progressive resistance training.

If you are over 65 and taking metformin, expect less muscle gain from resistance training compared to someone not taking it. This is likely due to how metformin affects cellular signaling (mTOR/AMPK). Do not stop your medication without medical advice, but adjust your expectations for muscle growth.

Once-weekly subcutaneous semaglutide 2.4 mg reduces the risk of major kidney composite endpoints (including macroalbuminuria and persistent eGFR decline) in patients with overweight/obesity and established cardiovascular disease, regardless of diabetes status.

If you have obesity and heart disease but no diabetes, semaglutide 2.4mg weekly offers significant kidney protection. It reduces the risk of serious kidney events like needing dialysis or developing heavy protein in the urine. While there is a temporary initial dip in kidney filtration numbers, long-term outcomes are better than placebo. This is a standard-of-care option for kidney risk reduction in this specific high-risk group.

Semaglutide 2.4 mg slows the rate of eGFR decline and reduces albuminuria (UACR) in patients with overweight/obesity, with greater benefits observed in those with baseline eGFR <60 ml/min/1.73m².

For patients with existing kidney impairment (eGFR <60), semaglutide not only slows further decline but may actually improve eGFR readings compared to placebo. It also significantly reduces albuminuria (protein in urine), a key marker of kidney stress. This benefit is consistent across subgroups.

Obesity is associated with decreased plasma adiponectin levels, which correlates with insulin resistance and an increased risk of type 2 diabetes.

Research shows that people with obesity often have lower levels of adiponectin, a hormone that helps regulate insulin sensitivity. This hormonal imbalance contributes to insulin resistance and increases the risk of type 2 diabetes. Understanding this biological link can help reduce self-blame and highlight the importance of addressing metabolic health through lifestyle changes and medical support.

Consumption of fructose or high-fructose corn syrup (HFCS) increases risk factors for metabolic syndrome and cardiovascular disease through rapid hepatic metabolism catalyzed by fructokinase C, which drives de novo lipogenesis and increases uric acid levels, independent of body weight gain.

Limit added sugars, specifically those containing fructose or high-fructose corn syrup (like soda and sweetened juices), regardless of whether you are trying to lose weight. The harm comes from how your liver processes fructose, which increases liver fat and bad cholesterol even if your weight stays the same. Focus on reducing sugar-sweetened beverages and replacing them with water or unsweetened options to lower metabolic risk.

Macrofungi are a source of high-quality protein, unsaturated fatty acids, and minerals, making them a low-calorie functional food suitable for general health.

Eat mushrooms regularly as a source of protein and fiber. They are low in calories but nutrient-dense, making them a good addition to a balanced diet.

Food availability is the primary determinant of food intake, as unavailability prevents consumption regardless of preference or biological drive.

To change eating habits, first ensure the desired foods are physically and economically accessible. Without availability, other interventions like education or willpower are significantly less effective.

Bariatric surgery (RYGB/VSG) provides superior sustained weight loss (13-27%) and T2D remission compared to pharmacological interventions, largely driven by endocrine changes rather than just mechanical restriction.

Bariatric surgery (like gastric bypass) is currently the most effective treatment for obesity, achieving 13-27% sustained weight loss and often curing type 2 diabetes. Its success is driven by hormonal changes (increased GLP-1/PYY) rather than just stomach size reduction. However, due to its invasive nature, it is reserved for extreme cases, driving the need for drugs that can mimic these hormonal effects.

High body mass index (BMI > 25 kg/m²) is a major global health risk factor that has caused a more than 2.5-fold increase in global deaths and disability-adjusted life years (DALYs) between 1990 and 2021, with cardiovascular diseases and diabetes being the leading causes of this burden.

High body mass index (BMI) is a major, modifiable risk factor for serious diseases like heart disease, diabetes, and kidney disease. The global burden of disease from high BMI has more than doubled in 30 years. To protect your health, it is crucial to monitor your BMI and work towards maintaining a healthy weight through sustainable lifestyle changes, as high BMI significantly increases your risk of premature death and disability.

Biofortification of staple crops (e.g., Golden Rice) with provitamin A carotenoids effectively prevents vitamin A deficiency and associated blindness in populations reliant on starch-based diets.

For populations dependent on staple crops, biofortified varieties like Golden Rice offer a sustainable solution to prevent vitamin A deficiency. This is a public health intervention rather than an individual dietary choice.

Obesity is primarily driven by excessive energy intake and physical inactivity, mediated by impaired central brain circuit regulation and neuroendocrine hormone dysfunction.

Focus on sustainable changes to energy intake and physical activity, but recognize that biological factors like hormones and brain circuits play a major role. If lifestyle changes are insufficient, consult a healthcare provider about medical interventions like drugs or surgery.

High genetic risk for obesity (high GSBMI) is significantly attenuated by frequent alcohol consumption, meaning daily drinkers experience a much smaller genetic effect on BMI compared to non-drinkers.

If you have a high genetic predisposition to obesity, your drinking habits matter more for your weight than the total amount you drink. Specifically, drinking alcohol frequently (daily) appears to blunt the genetic effect on BMI compared to not drinking or drinking rarely. However, this does not mean alcohol is 'good' for weight loss; it is a specific gene-environment interaction where the genetic risk manifests differently.

A slower usual walking pace significantly amplifies the genetic effect on BMI, with the genetic score effect being 2.5 times higher in slow walkers compared to brisk walkers.

If you are genetically prone to obesity, how fast you walk matters. Walking at a brisk pace significantly reduces the genetic impact on your BMI compared to walking slowly. Increasing your daily walking speed is a low-barrier way to mitigate genetic risk.