Browse the evidence

Indiscriminate use of energy drinks, particularly consuming more than one serving per day, may lead to adverse events and harmful side effects.

Do not consume more than one serving of an energy drink per day. If you need more caffeine, consider other sources or spacing them out, but be aware that high consumption increases the risk of adverse side effects. Consult a physician if you have any pre-existing health conditions.

The glycemic response (FPG reduction) during the first 3 weeks of caloric restriction is a strong predictor of overall glycemic improvement (FPG and HbA1c) at 20 weeks, independent of total weight loss.

Monitoring fasting blood glucose in the first 3 weeks of a new diet plan can help predict long-term success. If blood sugar levels drop significantly during this early period, it is a strong indicator that the patient will achieve better long-term glycemic control, regardless of the total amount of weight lost.

Short-term circadian misalignment (simulated night shift) significantly reduces skeletal muscle insulin sensitivity in healthy young men, primarily by decreasing nonoxidative glucose disposal.

If you work night shifts or have an irregular schedule, your body's ability to process glucose in your muscles is impaired, even if you get enough sleep and eat the same amount of food. This happens because your internal biological clock is out of sync with your behavior. To mitigate this, try to keep your meal and sleep times as consistent as possible relative to your work schedule, and be aware that your risk for insulin resistance is higher during periods of circadian disruption.

Taurine supplementation attenuates blood pressure and stroke incidence in salt-sensitive hypertensive models by modulating sympathetic nervous system activity and reducing inflammation.

In salt-sensitive individuals, taurine may help mitigate blood pressure spikes. This is supported by animal studies showing reduced stroke risk with taurine-rich diets. For humans, this suggests that maintaining adequate taurine intake, possibly through seafood, may be beneficial, especially if salt intake is high.

In older adults (aged 70-79), abdominal obesity (measured by waist circumference) is an independent risk factor for chronic heart failure, whereas total body mass index (BMI) is not a significant predictor when abdominal fat is accounted for.

If you are over 70, focus on your waist circumference rather than just your weight. A larger waist circumference significantly increases your risk of heart failure, even if your overall weight (BMI) is normal. Maintaining a smaller waist size is more critical for heart health than maintaining a specific total body weight.

When adipose tissue expansion capacity is exceeded, lipid accumulates in non-adipose tissues (lipotoxicity), which directly causes insulin resistance and metabolic syndrome.

Focus on strategies that improve your body's ability to store fat safely in adipose tissue (like increasing adipocyte number or function via PPARg activation) rather than just losing weight. If your body spills fat into organs (liver, muscle), it causes insulin resistance regardless of your total weight.

Activation of PPARg increases lipid storage capacity in adipose tissue, thereby preventing lipotoxicity and improving insulin sensitivity.

Medical treatments that activate PPARg (like TZDs) work by forcing fat cells to store more fat safely, keeping it out of the liver and muscles where it causes damage.

Specific nutrient intake accelerates the gastric emptying of that specific nutrient (e.g., glucose accelerates glucose emptying, fat accelerates fat emptying) through desensitization of intestinal feedback mechanisms.

If you need to absorb glucose quickly, train your stomach by consuming high glucose loads regularly. Similarly, high-fat diets accelerate fat emptying. This specificity means you should match your training nutrition to your race nutrition strategy.

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.

In diabetic men, exercise training reduces basal hepatic glucose production by 22%, even when insulin sensitivity (peripheral glucose disposal) does not improve.

For diabetic men, exercise may help lower fasting blood sugar by reducing the liver's glucose output, even if it doesn't improve how muscles use insulin. This suggests exercise has hepatic benefits distinct from peripheral insulin sensitivity.

Chronic aerobic exercise induces a significant increase in fasting plasma ghrelin levels proportional to the magnitude of weight loss, independent of changes in caloric intake.

If you start an aerobic exercise program and lose weight, your body will naturally increase hunger hormones (ghrelin) to try to regain the weight. This happens even if you don't change your diet. Expect to feel hungrier as you lose weight; this is a normal biological signal, not a sign that your exercise routine is failing.

In older men (aged 70-89), mid-range plasma testosterone levels (specifically the 2nd and 3rd quartiles, approx. 9.8–15.8 nmol/L) are associated with the lowest all-cause mortality, indicating a U-shaped relationship where both very low and very high levels carry higher risk.

For older men, maintaining testosterone in the mid-range (approx. 10-16 nmol/L) is associated with the lowest risk of death. Neither extremely low nor extremely high levels are optimal. This suggests that avoiding severe deficiency is critical, but pushing levels to the very top of the range may not offer additional survival benefits and could potentially be neutral or harmful.

Lorcaserin, a selective 5-HT2C receptor agonist, produces significant, dose-dependent weight loss in obese adults without the need for concurrent diet or exercise modifications.

Lorcaserin is a prescription medication that activates specific brain receptors to reduce appetite. In this 12-week study, obese adults lost an average of 3.6 kg on the highest dose without changing their diet or exercise habits. It is not a standalone solution but a tool to help regulate hunger signals.

Oxyntomodulin (OXM) induces superior body weight loss compared to selective GLP-1 receptor agonists by simultaneously activating both GLP-1 and glucagon receptors, thereby suppressing food intake and increasing energy expenditure.

Oxyntomodulin (OXM) is a gut-derived hormone that activates both GLP-1 and glucagon receptors. Clinical studies show that administering OXM subcutaneously three times daily before meals leads to modest but significant weight loss (approx. 2.3 kg over 4 weeks) in overweight individuals. It also improves glucose tolerance in Type 2 Diabetes patients. The dual receptor activation is key: GLP-1 reduces appetite and slows gastric emptying, while glucagon receptor activation may increase energy expenditure. However, the short half-life requires frequent dosing, and potential side effects like nausea must be managed.

Physical activity interventions significantly decrease circulating total and free estradiol levels in healthy women, with effects being more pronounced in non-obese individuals and those engaging in high-intensity or resistance exercise.

Engaging in regular physical activity, particularly high-intensity or resistance training, can help lower circulating estradiol levels in women. This benefit occurs independently of weight loss, meaning you can gain hormonal advantages even if your weight stays the same. Aim for varied exercise types, including resistance training, for potentially stronger effects.

Bariatric surgery (Roux-en-Y gastric bypass and sleeve gastrectomy) significantly increases HDL-C levels and improves HDL functionality (cholesterol efflux capacity and apoA-I exchange rate) in obese patients, particularly with sustained effects observed at 12 months post-surgery.

If you have severe obesity and are considering bariatric surgery, know that it is the most effective way to significantly boost your HDL cholesterol levels and improve how well your HDL functions (specifically its ability to remove cholesterol). Studies show that Roux-en-Y gastric bypass and sleeve gastrectomy can increase HDL-C by 30-32% over five years, far outperforming medical therapy alone. However, full functional benefits, such as improved cholesterol efflux, may take up to 12 months to manifest, so patience and adherence to post-surgical care are crucial.

Ephedrine ingestion (1 mg/kg) significantly increases early-phase power output (first 10 seconds) during high-intensity anaerobic exercise (Wingate test) by stimulating the central nervous system rather than skeletal muscle metabolism.

If you take 1 mg of ephedrine per kg of body weight 90 minutes before a short, maximal effort (like a 30-second sprint), you may generate slightly more power in the first 10 seconds. This benefit comes from nervous system stimulation, not muscle fuel. However, the effect vanishes after 15 seconds, and the safety risks (cardiovascular and cognitive) likely outweigh this marginal, short-lived gain for most non-elite users.

Caffeine ingestion (5 mg/kg) significantly increases time to exhaustion and oxygen deficit during supramaximal anaerobic exercise (MAOD test) by enhancing skeletal muscle metabolism and epinephrine release, rather than just CNS arousal.

Take 5 mg of caffeine per kg of body weight 90 minutes before a high-intensity, short-duration effort (like a hard cycling sprint to exhaustion). You can expect to last about 8% longer. This works by boosting adrenaline, which helps your muscles produce energy anaerobically. This benefit applies even if you drink coffee regularly.

Adaptogens (specifically Rhodiola rosea SHR-5, Schisandra chinensis, and Eleutherococcus senticosus) improve mental performance, attention, and endurance in states of fatigue by upregulating the stress-sensor protein Hsp70, which inhibits nitric oxide synthase II and prevents stress-induced ATP depletion.

If you are experiencing mental fatigue or burnout, specific adaptogenic extracts like Rhodiola rosea (SHR-5) taken at 576mg daily for 4 weeks may help improve your attention and reduce fatigue symptoms. Unlike caffeine, these are intended to help your body handle stress more efficiently rather than forcing energy, potentially avoiding the 'crash' associated with stimulants.

Peripheral administration of PYY 3-36 significantly inhibits food intake in humans by acting on hypothalamic Y2 receptors to suppress orexigenic NPY neurons.

Your gut naturally releases a hormone called PYY 3-36 after eating to tell your brain you are full. Research shows that maintaining or enhancing this signal can significantly reduce how much you eat. While current treatments focus on other pathways, understanding this natural mechanism highlights the importance of foods that stimulate gut hormone release for satiety.

Sibutramine (10-30 mg/day) produces significant, dose-dependent weight loss in obese adults over 24 weeks when combined with caloric restriction and lifestyle modification, with effects reversing upon discontinuation.

Take sibutramine (10-30mg daily) alongside a strict diet (1200-1500 kcal) and daily exercise. Expect significant weight loss (9-12%) over 6 months, but understand that stopping the medication will likely lead to weight regain. This drug is a tool to help you lose weight, not a permanent fix.

Engaging in moderate physical activity, specifically brisk walking for approximately 5 hours per week (27 MET-h/wk), significantly reduces the risk of invasive breast cancer in postmenopausal women.

If you are postmenopausal, aim for about one hour of brisk walking every day. You do not need to do high-intensity interval training or heavy lifting to lower your breast cancer risk. Consistency with moderate activity like brisk walking is the key factor identified in this study. If you were previously inactive, starting this routine now can still provide a protective benefit.

High plasma levels of Trimethylamine N-Oxide (TMAO) promote atherosclerosis and cardiovascular disease risk by impairing reverse cholesterol transport (RCT) and promoting foam cell formation.

High levels of TMAO, produced when your gut bacteria process nutrients like choline (eggs, meat) and carnitine (red meat), are linked to higher cardiovascular risk. This happens because TMAO impairs your body's ability to remove cholesterol from arteries (Reverse Cholesterol Transport). While you can't easily change your genes, understanding that gut bacteria play a key role suggests that dietary strategies might need to consider microbiome health, not just nutrient content.

During the menopausal transition and early postmenopause, sleep symptoms (difficulty falling asleep, nighttime awakening, early morning awakening) are significantly associated with vasomotor symptoms (hot flashes), psychological distress (depressed mood, anxiety), and perceived health, rather than being driven solely by hormonal changes like FSH or estradiol levels.

If you are experiencing sleep issues during menopause, look beyond just hormone levels. Address hot flashes, manage stress, and monitor your mood, as these factors are strongly linked to sleep quality. Improving your overall perceived health and managing vasomotor symptoms may be more effective for sleep than focusing on hormonal markers alone.