Browse the evidence

Prenatal exposure to famine during early and mid-gestation is associated with a doubling of the prevalence of obesity in adulthood.

For individuals with a history of prenatal famine exposure, adult obesity risk may be biologically programmed during early development. This suggests that standard weight loss interventions might face higher resistance due to altered metabolic set points established in utero.

Centenarians and exceptionally long-lived individuals carry a similar burden of common complex disease risk alleles as the general population, suggesting that protective genetic factors buffer these risks rather than an absence of risk alleles.

You cannot change your inherited disease risk alleles, but longevity research suggests that having them does not preclude a long life. The key for the exceptionally long-lived is not the absence of risk, but the presence of protective genetic factors that 'buffer' or mitigate the impact of those risks. Focus on healthspan and managing modifiable factors, as genetic buffering appears to play a critical role in delaying disease onset.

The Tanita foot-to-foot bioelectrical impedance analyser provides body fat estimates with accuracy comparable to conventional tetrapolar impedance systems (Bodystat) when validated against a four-compartment model, despite having slightly wider limits of agreement.

You can use a simple foot-to-foot body fat scale (like the Tanita) at home with confidence. It is just as accurate as more expensive, complex hand-to-foot impedance machines when compared to high-end lab tests. Do not assume that holding handles or using more electrodes makes the reading better; the simpler device performs equivalently.

Transnational food and beverage corporations (TFBCs) drive the nutrition transition in Asia by leveraging market power to increase the availability, affordability, and desirability of ultra-processed foods, leading to rising rates of obesity and diet-related non-communicable diseases.

Understand that your food environment is not neutral. Transnational corporations actively shape what is available, how much it costs, and how appealing it is. To protect your health, prioritize unprocessed foods from sources less influenced by these corporate supply chains, such as local markets or home preparation, and be critical of marketing claims for ultra-processed products.

Obesity and overweight are associated with a gut microbiota profile characterized by a significantly higher Firmicutes-to-Bacteroidetes ratio, increased abundance of SCFA-producing Firmicutes taxa (e.g., Lachnospiraceae, Ruminococcus gnavus), and decreased abundance of Bacteroidetes taxa (e.g., Bacteroides uniformis, Flavobacteriaceae).

Your gut bacteria composition changes with obesity, specifically showing more Firmicutes and fewer Bacteroidetes. This isn't just a side effect; these bacteria influence how you harvest energy and store fat. To shift your microbiome toward a healthier profile, focus on increasing dietary fiber intake and physical activity, which are associated with higher Bacteroidetes abundance and lower Firmicutes dominance.

Current smoking is associated with a lower prevalence of obesity compared to never smoking, but this protective association is not present in individuals aged 40 or younger and is reversed in heavy smokers (>20 cigarettes/day).

If you are a heavy smoker, you may actually have a higher risk of obesity than non-smokers, contradicting the idea that smoking helps you stay thin. If you are under 40, smoking does not appear to protect you from obesity. Quitting smoking often leads to weight gain, so plan for weight management support when you quit.

Laparoscopic One-Anastomosis Gastric Bypass (OAGB) is a safe and effective surgical intervention for morbid obesity that achieves durable excess weight loss (mean 70-88% at 6-12 years) and remission of comorbidities with lower operative time and complexity compared to Roux-en-Y gastric bypass.

This is a surgical intervention, not a lifestyle protocol. For a patient with a BMI >40, OAGB offers a permanent anatomical change that restricts stomach size and bypasses a portion of the small intestine. The procedure requires strict adherence to a preoperative liquid diet and lifelong daily vitamin/mineral supplementation to prevent deficiencies. The primary benefit is significant, durable weight loss and resolution of obesity-related comorbidities like diabetes and hypertension, with a safety profile comparable to or better than more complex bypass surgeries.

Sedentary behavior contributes to cancer risk through biological mechanisms involving adiposity, metabolic dysfunction (insulin/glucose), sex hormones, inflammation, and vitamin D levels.

Understanding that sitting affects hormones, inflammation, and metabolism helps explain why just 'moving more' isn't enough; reducing sitting time helps normalize these biological markers.

Females experience greater central limitations to whole-body exercise performance due to smaller lung volumes and airways, leading to higher mechanical work of breathing and a greater prevalence of exercise-induced arterial hypoxemia (EIAH).

Women may experience breathing-related fatigue sooner than men during high-intensity whole-body exercise due to smaller airways and lungs. This can limit performance despite good muscle endurance. Training that improves respiratory efficiency or pacing strategies may be beneficial.

Obesity prevalence trends in high-income countries have stabilized or plateaued since approximately 2000, contrasting with continuous increases in low- and middle-income nations.

If you live in a high-income country, the trend of rising obesity rates has likely slowed or stopped for your demographic since 2000. This suggests that societal changes (diet, activity) have reached a new equilibrium. However, this stability is not guaranteed to persist, and severe obesity is still rising, so individual action remains critical.

Severe obesity is rising rapidly in high-income countries and is projected to double in prevalence between 2020 and 2035, posing a significant threat to healthcare systems.

Even if general obesity rates have stabilized in your country, severe obesity is doubling. This means the health risks and healthcare costs are increasing significantly. Focus on preventing the progression to severe obesity through early intervention.

A composite biomarker score derived from alpha-1-acid glycoprotein, albumin, VLDL particle size, and citrate significantly improves the prediction of short-term (5-year) all-cause mortality risk compared to conventional risk factors alone.

While this study identifies four specific biomarkers (alpha-1-acid glycoprotein, albumin, VLDL particle size, and citrate) that predict mortality risk better than standard factors, these tests are not currently standard clinical practice for mortality prediction. The findings suggest that looking beyond standard cholesterol and blood pressure to include markers of inflammation and metabolic health could offer a more complete picture of long-term health risks. For now, maintaining healthy levels of these markers through a balanced diet, regular exercise, and managing inflammation remains the practical takeaway.

Using fixed, high-threshold end criteria (RER ≥ 1.15 or blood lactate ≥ 8.0 mmol/L) to determine maximal oxygen uptake (VO2max) systematically underestimates the VO2max of older adults and women, leading to their exclusion from fitness assessments.

If you are testing older adults or women, do not use rigid cutoffs like RER ≥ 1.15 or Blood Lactate ≥ 8.0 mmol/L. These numbers are too high for their physiology and will falsely label them as 'not trying hard enough' or exclude them from your data. Use age- and sex-adjusted criteria (e.g., lower lactate thresholds for older adults) or rely on voluntary exhaustion combined with RER ≥ 1.0-1.1 to get an accurate VO2max.

Mitochondrial dysfunction and the subsequent release of mitochondrial DAMPs (such as mtDNA and ROS) drive chronic sterile inflammation (inflammaging), which accelerates aging and age-related pathologies.

Focus on maintaining mitochondrial quality control through regular physical activity and healthy metabolic function rather than relying solely on antioxidant supplements. Mitochondrial health supports immune regulation, which is critical for healthy aging.

A decline in mitophagy with age leads to the accumulation of dysfunctional mitochondria, increased ROS, and functional decline, suggesting that restoring mitophagy could mitigate age-related deficits.

Maintaining mitochondrial health through exercise and metabolic health supports natural mitophagy. This is a key factor in preventing age-related muscle loss and fatigue.

The 'Obesity Paradox' (lower mortality in obese patients with certain chronic diseases) is largely an artifact of using BMI, which fails to distinguish between high fat mass and high muscle mass, and ignores the inflammatory status of visceral fat.

If you have a chronic condition, do not try to gain weight to 'beat' the odds. Focus on preserving muscle mass through resistance training and adequate protein. The 'paradox' is a measurement error; high muscle is good, high visceral fat is bad.

Intermittent hypoxia, the hallmark of Obstructive Sleep Apnoea/Hypopnoea Syndrome (OSAHS), induces oxidative stress by increasing reactive oxygen species (ROS) production, which leads to endothelial dysfunction, inflammation, and subsequent cardiovascular morbidity.

If you have OSAHS, treating the breathing disorder (e.g., with CPAP) is critical not just for sleep quality but to reduce oxidative stress and lower your risk of heart disease. The repeated dropping of oxygen levels during sleep causes chemical damage to your blood vessels; fixing the breathing stops this damage.

High-level occupational physical activity is associated with an 18% increased risk of all-cause mortality in men compared to low-level occupational activity, a finding attributed to the 'physical activity paradox' where occupational demands differ detrimentally from leisure-time activity.

If your job involves heavy manual labor, standing for long periods, or repetitive strain, be aware that this specific type of activity may increase your long-term mortality risk compared to sedentary office work, even if you are physically fit. To mitigate this, prioritize leisure-time activities that focus on cardiovascular fitness and recovery, rather than just adding more physical exertion. Current general physical activity guidelines may not adequately protect those in physically demanding jobs.

Chronic oxidative stress and the resulting accumulation of oxidized, carbonylated proteins drive the loss of proteostasis and trigger cellular senescence, a primary mechanism of aging.

Focus on reducing chronic oxidative stress through a nutrient-dense diet rich in antioxidants (micronutrients, trace elements) and maintaining metabolic health to support proteostasis. This may help delay the onset of cellular senescence and age-related diseases.

Even when primary risk factors (blood pressure, cholesterol, HbA1c, BMI) are successfully controlled through treatment, a significant proportion of patients (approx. 35-39%) remain at high cardiovascular disease risk.

Even if your doctor gets your blood pressure, cholesterol, or blood sugar under control, you are not necessarily 'out of the woods.' The study shows that about 1 in 3 people who successfully control these numbers still have a high risk of heart disease. To truly protect your heart, you must address ALL risk factors, including smoking, weight, and physical activity, not just the one your medication targets.

Sarcopenia, defined by low muscle mass and slow gait speed, is associated with a significantly increased risk of all-cause mortality in community-dwelling older adults.

If you are an older adult, maintaining your walking speed and muscle mass is crucial for longevity. You can assess your risk by checking if your gait speed is slower than 0.8 m/s or if you have low muscle mass. This condition, known as sarcopenia, significantly increases your risk of death, so it warrants attention and potential lifestyle interventions like resistance training.

Obesity, defined by BMI or waist circumference, does not modify the relationship between sarcopenia and all-cause mortality.

For older adults, having extra body fat does not cancel out the dangers of sarcopenia. Whether you are obese or not, having low muscle mass and slow walking speed increases your risk of death. Focus on maintaining muscle mass rather than just weight.

Dietary intake of choline, carnitine, and TMAO from foods like red meat, eggs, and marine fish is converted by gut bacteria into trimethylamine (TMA), which is then oxidized by the host enzyme FMO3 into trimethylamine N-oxide (TMAO), a metabolite implicated in cardiovascular disease and metabolic disorders.

Your gut bacteria convert nutrients from foods like red meat, eggs, and fish into TMA, which your liver turns into TMAO. High TMAO levels are linked to heart disease risk. To manage this, focus on dietary variety and gut health, as not all sources (like betaine) produce TMA, and individual microbiome differences affect how much TMAO you produce.

Gut microbiota composition directly influences circulating levels of metabolites such as acetate, glutamine, and TMAO, which are associated with metabolic traits including insulin resistance, lipid profiles, and glucose tolerance.

Your gut bacteria produce metabolites that affect your blood lipids, glucose, and inflammation. While this paper doesn't prescribe a specific diet, it highlights that the types of bacteria in your gut are linked to metabolic health markers. Focusing on a diverse diet that supports beneficial bacteria (like those producing acetate) may support metabolic balance, though individual responses vary.