Browse the evidence

Adopting a low-fat dietary pattern (targeting 20% of energy from fat) with increased intake of vegetables, fruits, and grains does not cause weight gain in postmenopausal women over a 7.5-year period, and is associated with modest weight loss compared to a control group.

If you are a postmenopausal woman, switching to a diet lower in fat (around 20% of calories) and higher in vegetables, fruits, and whole grains will not cause you to gain weight, even if you do not count calories. In fact, you may lose a small amount of weight (approx. 2kg in the first year) compared to staying on your usual diet. Focus on replacing fat calories with plant-based carbohydrates rather than restricting total food volume.

Genetically predicted higher circulating levels of branched-chain amino acids (isoleucine, leucine, and valine) causally increase the risk of developing type 2 diabetes.

This research suggests that for individuals with specific genetic variants (like those affecting the PPM1K gene), the body's ability to break down branched-chain amino acids (found in protein) is impaired, leading to higher blood levels of these amino acids and a significantly increased risk of type 2 diabetes. It highlights that metabolic processing of protein varies by genetics. If you have a family history of diabetes, discussing your metabolic health with a doctor is important, but do not arbitrarily eliminate protein without professional guidance, as the root cause here is a specific enzymatic bottleneck, not protein itself for the general population.

Light exposure at specific times (dusk/dawn) resets the central SCN clock by inducing Per1/Per2 gene expression, with the direction of the shift (advance vs. delay) depending on the timing of light exposure.

View bright light in the morning to advance your clock (wake up earlier) and avoid bright light in the evening to prevent delays (stay up later). This leverages your biology to align your sleep with your schedule.

Front-of-package (FOP) nutrition labels significantly improve consumers' ability to identify healthier products, but their ability to nudge actual purchase behavior or consumption toward healthier choices is limited.

Use Front-of-Package labels to quickly scan for healthier options among similar products, as they effectively aid identification. However, do not rely on these labels alone to control portion sizes or total calorie intake, as they often trigger a 'health halo' that may lead to consuming more of unhealthy 'vice' products. For actual dietary changes, cross-reference with the full Nutrition Facts Panel or other nutritional data.

Interpretive nutrient-specific labels (e.g., Traffic Light) improve health perceptions for both 'virtue' (healthy) and 'vice' (unhealthy) products, but only increase purchase intention for virtue products.

When using nutrient-specific labels like Traffic Lights, be aware that they may make you perceive unhealthy ('vice') products as healthier than they are, without necessarily making you buy them. However, they do successfully encourage the purchase of healthy ('virtue') products. Use these labels to reinforce good choices, but do not assume a 'green' label on a junk food item makes it a healthy choice.

Pharmacological inhibition of DPP-4 improves glycemic control in Type 2 Diabetes by preventing the degradation of endogenous incretin hormones (GLP-1 and GIP), thereby enhancing glucose-dependent insulin secretion and suppressing glucagon.

DPP-4 inhibitors (like vildagliptin, sitagliptin) are oral medications that help your body manage blood sugar more effectively by keeping your natural 'incretin' hormones (GLP-1 and GIP) active longer. They are safe, well-tolerated, and do not typically cause low blood sugar on their own. They work best when your blood sugar is high, stimulating insulin only when needed.

Elevated levels of C-reactive protein (CRP) and Serum Amyloid A (SAA) serve as independent predictors of cardiovascular events and are directly linked to obesity-induced inflammation.

High CRP and SAA levels are warning signs of inflammation linked to excess body fat. Monitoring these markers can help assess cardiovascular risk, and reducing body fat can lower these levels.

Obesity and advanced age are the primary drivers of the increasing global prevalence of obstructive sleep apnea (OSA).

Maintaining a healthy weight and managing age-related changes are key to preventing OSA. If you are overweight or older, be aware of the increased risk and seek screening if you have symptoms like snoring or daytime sleepiness.

Adult weight gain is associated with a statistically significant increased risk of postmenopausal breast, endometrial, and ovarian cancers, as well as colon and kidney cancers, with risk increasing by approximately 6-39% per 5 kg of weight gain.

Avoiding adult weight gain is a proven strategy to reduce the risk of several cancers, particularly in postmenopausal women and men. Focus on maintaining a stable weight from early adulthood onwards, as even modest gains (5 kg) are linked to higher risks for breast, endometrial, ovarian, colon, and kidney cancers. This is especially important for postmenopausal women not using hormone replacement therapy.

Among long-acting GLP-1 receptor agonists, once-weekly exenatide is associated with the lowest risk of vomiting compared to other agents in the class.

If you are considering a GLP-1 medication and are concerned about vomiting, once-weekly exenatide appears to have the lowest risk of this specific side effect compared to other long-acting options like taspoglutide or dulaglutide. However, all GLP-1s carry a risk of GI side effects, so discuss your tolerance with your doctor.

Long-acting GLP-1 receptor agonists (dulaglutide, liraglutide, once-weekly exenatide) are associated with greater weight loss compared to short-acting agents (EBID, lixisenatide) when directly compared, although differences among long-acting agents are not clinically meaningful.

If weight loss is a priority, long-acting GLP-1 medications (like Liraglutide or EBID) tend to produce greater weight loss than short-acting Lixisenatide. However, there are no clinically meaningful differences in weight loss between the long-acting agents themselves (Dulaglutide, Liraglutide, Once-weekly Exenatide).

Light is the primary circadian synchronizer in humans, capable of eliciting weak (Type 1) or strong (Type 0) resetting depending on stimulus strength and timing.

Treat light as your primary sleep regulator. Morning bright light and evening dim light are critical for setting your internal clock. Avoid bright light at night and seek bright light during the day to maintain a healthy circadian rhythm.

Blue light (short-wavelength) is the most effective at resetting the human circadian system and suppressing melatonin.

Prioritize blue light exposure during the day to boost alertness and set your circadian clock. Avoid blue light from screens and bright lights in the evening to protect melatonin production.

Modifiable risk exposures, specifically dietary risks, high systolic blood pressure, high body mass index, high total cholesterol, high fasting plasma glucose, tobacco smoking, and low physical activity, are the primary drivers of the large geographic disparities in cardiovascular disease burden across US states.

To lower your cardiovascular disease risk, focus on the major modifiable factors identified: improve your diet, manage your blood pressure and cholesterol, maintain a healthy weight, control blood glucose, avoid smoking, and increase physical activity. These are the primary drivers of CVD burden, and addressing them can significantly reduce your risk, regardless of where you live.

EPA and DHA modify cell membrane structure and function, leading to altered lipid mediator production (eicosanoids, resolvins, protectins) and gene expression, which underlies their anti-inflammatory and immune-modulating effects.

Consuming EPA and DHA changes how your cells work. They become more fluid, produce different signaling molecules (some anti-inflammatory), and change which genes are turned on or off. This is how fish oil exerts its health benefits.

Automated insulin delivery (AID) systems significantly improve glycemic control in people with type 1 diabetes by increasing time in range and reducing hypoglycemia compared to other therapies.

If you have Type 1 Diabetes, an Automated Insulin Delivery (AID) system is a highly effective tool to improve your blood sugar control. It automatically adjusts your insulin based on real-time glucose readings, helping you spend more time in your target range and less time in dangerous low or high states. While it still requires you to count carbs and announce meals, the system handles the fine-tuning. Ensure you receive proper training and support from your healthcare provider to get the most benefit and address any access barriers.

Women with polycystic ovary syndrome (PCOS) exhibit an intrinsic reduction in insulin sensitivity of approximately 27% compared to controls, a deficit that persists independently of body mass index (BMI), age, or diagnostic criteria.

If you have PCOS, you likely have an intrinsic metabolic disadvantage regarding insulin sensitivity, regardless of your weight. This is not just about 'eating less' or 'exercising more' to fix a weight problem; it is a physiological trait of the syndrome. Management should focus on strategies that improve insulin sensitivity (like specific dietary patterns or medications) rather than assuming weight loss alone will normalize metabolic health.

Higher body mass index (BMI) exacerbates insulin resistance in women with PCOS more severely than in healthy controls, with a 10-unit increase in BMI associated with a 28% greater reduction in insulin sensitivity in PCOS compared to a 15% reduction in controls.

For women with PCOS, gaining weight has a more damaging effect on insulin sensitivity than it does for women without PCOS. This means weight management is critically important for PCOS patients, not just for appearance, but to mitigate the amplified metabolic risk. Maintaining a healthy weight is a key strategy to counteract the intrinsic insulin resistance.

Short-chain fatty acids (SCFAs) like butyrate, produced by gut bacteria from dietary fiber, have anti-inflammatory, anti-cancer, and barrier-integrity functions, and their production declines with age and frailty.

Eat enough dietary fiber (fruits, vegetables, whole grains) to feed your gut bacteria. They will produce SCFAs like butyrate, which protect your gut lining, reduce inflammation, and support metabolic health. This is especially important as you age.

Cold water immersion (temperature <15°C) and cryotherapy reduce DOMS, but they do not significantly alter inflammatory markers (IL-6, CRP) or muscle damage markers (CK) after a single session.

If you want to feel less sore after a hard workout, try a 11-15 minute cold water bath (below 15°C) immediately after. It will help you feel better and less tired, but don't expect it to actually repair your muscle tissue or lower inflammation markers in your blood.

Compression garments and immersion significantly reduce subjective DOMS and perceived fatigue, but they do not significantly alter blood markers of muscle damage (CK) or inflammation (IL-6, CRP).

Wear compression garments for 24 hours after intense exercise to help manage pain and tiredness. They will make you feel better, but they will not actually repair your muscle tissue or lower inflammation in your blood.

Global prevalence of vitamin D deficiency (serum 25(OH)D <30 nmol/L) is 15.7%, with significantly higher rates in high-latitude regions, winter-spring seasons, females, and lower-middle-income countries.

Vitamin D deficiency is a global issue affecting roughly 16% of adults, with higher risks in winter, at high latitudes, and for women. To mitigate this, prioritize Vitamin D supplementation or consumption of fortified foods, especially if you live in northern regions, wear covering clothing, or have limited sun exposure. Regular testing of serum 25(OH)D levels is recommended to ensure adequacy.

Ketone bodies (KBs) serve as an efficient energy source that bypasses glycolysis, promoting mitochondrial oxidative metabolism and reducing oxidative stress.

Your brain can run efficiently on ketone bodies produced by the ketogenic diet. These molecules enter the Krebs cycle directly, bypassing the slower glycolytic pathway, which enhances mitochondrial energy production and reduces oxidative stress. This metabolic shift is central to the diet's benefits for neurological and metabolic health.

Functional Overreaching (FOR) is a normal part of training that leads to performance improvement after recovery, whereas Non-Functional Overreaching (NFOR) and Overtraining Syndrome (OTS) involve prolonged maladaptation and performance decrements that take weeks or months to resolve.

Expect temporary performance dips during intense training blocks. This is 'Functional Overreaching' and is necessary for improvement. If the dip lasts weeks or months and is accompanied by mood disturbances or hormonal changes, it may be 'Non-Functional Overreaching' or 'Overtraining Syndrome,' requiring extended rest and medical evaluation.