Browse the evidence

Consumer-grade wearable sleep-tracking devices (e.g., smartwatches, rings) provide sleep data that is comparable to or superior to traditional actigraphy when validated against polysomnography (PSG), primarily due to the integration of photoplethysmography (PPG) and machine learning algorithms.

For sleep research, modern consumer wearables (smartwatches/rings) are now more accurate than traditional actigraphy for estimating sleep stages, provided you account for their limitations in specific populations (e.g., obesity, darker skin). Do not assume 'research-grade' labels guarantee accuracy without validation; validate the specific device against PSG for your target population.

Visceral adiposity, rather than overall body mass index (BMI), is the critical driver of metabolic syndrome comorbidities, including insulin resistance and cardiovascular risk.

Do not rely on BMI alone to assess your health risk. Waist circumference is a better indicator of visceral fat, which drives metabolic syndrome. Even if you are lean, high abdominal fat increases your risk for diabetes and heart disease.

The kidney benefits of semaglutide are largely mediated by weight loss, although direct GLP-1 receptor effects on the kidney may also contribute.

While semaglutide has direct kidney-protective properties, most of its benefit comes from the weight loss it induces. Therefore, maintaining weight loss is crucial for sustaining kidney protection.

Treatment with glucagon-like peptide-1 receptor agonists (GLP-1 RAs) is associated with a reduced incidence of dementia in patients with type 2 diabetes.

If you have Type 2 Diabetes, discuss GLP-1 receptor agonists (like liraglutide or semaglutide) with your doctor. This paper suggests these medications may lower your risk of developing dementia compared to other diabetes treatments. This is particularly relevant if you are at high cardiovascular risk.

Adherence to a healthful plant-based diet is associated with a lower risk of cardiovascular disease (CVD), specifically myocardial infarction and ischemic stroke, independent of genetic predisposition.

If you have a family history of heart disease, adopting a diet rich in whole plant foods (grains, fruits, veggies, nuts, legumes) and low in processed foods and animal products can still significantly lower your risk of heart attack and stroke.

Adherence to an unhealthful plant-based diet (high in refined grains, sugary drinks, sweets, and animal products) is associated with a higher risk of all-cause mortality, cardiovascular disease, and cancer.

Avoid relying on processed plant-based foods, sugary drinks, and sweets. Focus on whole plant foods like whole grains, fruits, vegetables, nuts, and legumes to lower your risk of death, heart disease, and cancer.

In Chinese adults with type 2 diabetes, higher levels of abdominal obesity indices (waist circumference, visceral adiposity index, lipid accumulation product, and Chinese visceral adiposity index) are significantly associated with an increased risk of incident cardiovascular events, with CVAI demonstrating the strongest predictive performance.

For people with type 2 diabetes, monitoring waist circumference or using calculated indices like CVAI is more critical for predicting heart disease risk than BMI alone. Reducing abdominal fat deposition is a key intervention strategy, particularly for those who are not overweight by BMI standards but carry visceral fat.

Intermittent fasting and time-restricted feeding activate AMPK and improve health outcomes by mimicking some benefits of caloric restriction without necessarily reducing total calories.

Try eating all your meals within a restricted window of time each day (e.g., 8 hours). This activates AMPK, a key energy sensor, which can improve health and function even if you don't count calories.

Anti-Müllerian Hormone (AMH) testing can be used as an alternative to ultrasound for diagnosing PCOS in adults, offering a low-cost, convenient option without evidence of overdiagnosis.

If you are an adult being evaluated for PCOS, ask your doctor if Anti-Müllerian Hormone (AMH) blood testing is a suitable alternative to ultrasound. This may be a more convenient and cost-effective diagnostic option with strong supporting evidence.

Long-term caloric restriction (25% reduction) slows the pace of biological aging as measured by DunedinPACE in healthy adults, though it does not significantly alter static biological age estimates from PhenoAge or GrimAge clocks.

If you can sustain a moderate calorie deficit (even around 10-15%), it may slow the rate at which your body ages biologically, as measured by specific epigenetic markers. This does not necessarily reverse your current biological age, but it may slow the accumulation of age-related damage. Consistency over two years is key, and behavioral support helps maintain the deficit.

Tirzepatide and semaglutide produce similar reductions in fasting appetite and ad libitum energy intake during lunch, indicating that differences in weight loss between the two drugs are not explained by appetite suppression alone.

Both tirzepatide and semaglutide reduce hunger and calorie intake similarly during lunch. However, tirzepatide leads to more fat loss. This suggests that tirzepatide might work through additional mechanisms, such as increasing energy expenditure or changing how fat is stored, rather than just making you feel less hungry than semaglutide does.

Consumption of probiotic fermented milks and yoghurts is associated with improved bone mineral density (BMD) and a significantly reduced risk of osteoporosis and osteopenia, particularly in females.

Aim for at least one serving of yoghurt or fermented milk daily. This provides bio-available calcium and protein that support bone density. If you have lactose sensitivity, fermented options like yoghurt are often better tolerated than plain milk. For bone strength, combine this with weight-bearing exercise.

Consumption of probiotic yoghurt containing specific strains (L. acidophilus La5 and B. lactis Bb12) improves glycemic control (fasting blood sugar, HbA1c) and lipid profiles in patients with Type 2 Diabetes.

If you have Type 2 Diabetes, incorporating 300g of probiotic yoghurt daily (specifically with L. acidophilus La5 and B. lactis Bb12) may help lower blood sugar and cholesterol levels. Consult your doctor before making dietary changes.

Higher consumption of ultra-processed foods (UPFs) is associated with an increased risk of overall cancer incidence and cancer-related mortality, with specific significant associations observed for ovarian and breast cancer mortality.

To lower your risk of cancer, try to reduce the proportion of ultra-processed foods in your diet. This includes items like soft drinks, packaged snacks, and reconstituted meat products. Focus on replacing these with unprocessed or minimally processed foods like fruits, vegetables, and whole grains. This change is particularly important for preventing ovarian and breast cancer mortality.

Higher TyG-BMI values are positively and linearly associated with increased risk of cardiovascular disease in individuals with Cardiovascular-Kidney-Metabolic (CKM) syndrome stages 0-3.

If you have metabolic risk factors or early kidney/heart issues, monitoring your Triglyceride-Glucose BMI (TyG-BMI) is a valuable tool for predicting heart disease risk. This index combines your body mass with blood sugar and fat levels to assess insulin resistance. Keeping this index low through lifestyle management (diet and exercise) is critical for preventing cardiovascular events, especially if you are over 45.

For very short bouts of physical activity (less than 1 minute), a minimum proportion of vigorous intensity (at least 12-15%) is required to significantly reduce the risk of Major Adverse Cardiovascular Events (MACE), though all-cause mortality benefits may appear at lower vigorous thresholds.

If you can only manage very short bursts of activity (under a minute), make sure they include some vigorous effort, like running up stairs quickly or walking very fast. This high-intensity component is crucial for protecting your heart when the duration is minimal.

Higher dietary fiber intake is associated with a 25% reduction in all-cause mortality in adults with established cardiovascular disease.

If you have heart disease, eating more fiber-rich foods like whole grains, fruits, and vegetables can help you live longer. Studies show that people with heart disease who eat more fiber have a 25% lower risk of dying from any cause compared to those who eat less fiber.

Increased sleep irregularity (defined as higher standard deviation of daily sleep duration) is associated with increased odds of incident obesity, essential hypertension, hyperlipidemia, major depressive disorder, and generalized anxiety disorder.

Focus on keeping your sleep schedule consistent. Going to bed and waking up at roughly the same time every day is critical for preventing obesity, hypertension, and depression, even if you are getting the recommended 7-9 hours of total sleep. Use wearable data to track your sleep regularity (consistency) rather than just total hours.

Higher percentages of REM and deep sleep are associated with a reduced incidence of atrial fibrillation, while higher light sleep percentages are associated with increased odds of atrial fibrillation.

Prioritize sleep quality that promotes REM and deep sleep. While total duration is important, the composition of your sleep matters for heart health. Consistent sleep schedules and avoiding alcohol before bed may help increase deep and REM sleep, thereby reducing atrial fibrillation risk.

Average daily sleep duration exhibits a J-shaped association with hypertension, major depressive disorder, and generalized anxiety disorder, where both short (5h) and long (10h) durations increase risk compared to the median (6.8h).

Aim for approximately 7 hours of sleep per night. Both sleeping significantly less (5 hours) or significantly more (10 hours) is associated with higher risks of hypertension, depression, and anxiety. Use your wearable to track your average daily sleep duration and adjust your schedule to stay within the moderate range.

Semaglutide at its maximum tolerated dose (MTD) is associated with the highest odds of treatment discontinuation due to adverse events among all tested regimens, including tirzepatide MTD.

If you choose semaglutide at its maximum dose, be aware that you have the highest statistical risk of stopping the medication due to side effects compared to other options in this study. Monitor your tolerance closely and communicate with your provider immediately if side effects become unmanageable.

Tirzepatide demonstrates cardiovascular safety, with hazard ratios for major adverse cardiovascular events (MACE) remaining below 1.3 compared to pooled comparators, indicating no increased cardiovascular risk.

For patients with heart disease or high risk factors, Tirzepatide has been shown to be safe regarding cardiovascular events. It does not increase the risk of heart attack, stroke, or cardiovascular death compared to standard treatments. This makes it a viable option for those who need effective diabetes management without compromising heart health.

Resting metabolic rate (RMR) reduction following weight loss is driven primarily by the loss of adipose tissue mass and metabolic adaptations, rather than the loss of skeletal muscle mass.

You don't need to obsess over preserving every gram of muscle to stop your metabolism from slowing down. Research shows that losing fat mass itself, along with hormonal shifts (like lower leptin and thyroid hormones), is what actually drives your resting metabolic rate down after weight loss. This means metabolic adaptation is a natural response to losing fat, not just a failure to build muscle. To manage this, focus on sustainable, slower weight loss and personalized strategies that address these hormonal changes, rather than just trying to 'save' muscle.

Diet order effects on energy balance and body composition are not observed when comparing Ultra-Processed Foods (UPF) to Minimally Processed Foods (MPF) if the diets are matched for macronutrients, energy density, and fiber.

When comparing ultra-processed foods to minimally processed foods, the physical properties of the food (energy density, fiber, volume) matter more than the processing status itself for determining intake. In this study, when UPF and MPF were matched for these properties, there was no difference in weight loss or energy intake based on which diet was eaten first. This suggests that formulating UPF to match the fiber and density of whole foods may mitigate overeating behaviors.