Browse the evidence

Using caffeine supplements is associated with a significantly higher risk of using non-third-party tested supplements compared to other supplement types.

If you use caffeine supplements, you are at the highest risk of using untested products. Be extra vigilant: look for third-party testing logos (NSF, Informed Choice) on caffeine products, especially pre-workouts, as they are frequently adulterated.

Advanced resistance training systems (Rest-Pause and Sarcoplasmic Stimulating Training) induce significantly higher perceived exertion, pain, and displeasure compared to traditional multi-set training, despite producing lower post-exercise lactate concentrations.

If you are an experienced lifter, advanced techniques like Rest-Pause or Sarcoplasmic Stimulating Training can increase your total training load and volume, which are key for muscle growth. However, be aware that these methods will feel significantly more painful and unpleasant than standard training, even if they produce less lactate. Because of this high discomfort, these systems are best reserved for experienced athletes who can tolerate the psychological burden, rather than beginners.

For non-resistance trained women, distributing resistance training volume across four weekly split-body sessions yields equivalent maximal strength, muscle mass, and explosive power gains compared to two weekly full-body sessions, provided total weekly volume is equated.

If you are new to resistance training, you do not need to commit to four gym days a week to get strong or build muscle. You can achieve the same results with just two full-body sessions per week, as long as you perform the same total amount of work (sets and reps). Choose the schedule that fits your life best, as forcing four sessions may lead to dropping out.

Performing one long resistance training session results in higher perceived effort and discomfort, but also higher session pleasure and preference compared to splitting the same workout into two shorter sessions.

If you enjoy feeling like you've worked hard, do one long session. If you prefer to feel less uncomfortable during the workout, split it. Both approaches are valid; choose based on your psychological preference.

A high-protein breakfast (34g) significantly increases subjective satiety and reduces hunger compared to a low-protein breakfast (6g) in young women with overweight, but this does not translate to reduced daily energy intake.

If you switch to a high-protein breakfast, you will likely feel fuller and less hungry in the hours after eating. However, be aware that this feeling of fullness may not automatically lead to eating less food throughout the rest of the day, as this study showed no difference in total daily energy intake.

Synchronous remote weight management interventions for adults with excess weight (BMI ≥ 27.5 kg/m2) face significant engagement barriers including privacy concerns, time burden, technical issues, and digital exclusion, which can be mitigated by facilitators such as digital competency, tailored feedback, convenience, and professional support.

To succeed with a remote weight management program, prioritize platforms that offer strong privacy protections, ease of use, and professional support. Address technical barriers by ensuring you have reliable internet and basic digital skills. Leverage features like self-monitoring and tailored feedback to maintain engagement, as these are key facilitators identified in the research.

The effectiveness of interventions on fiber intake diminishes over time, with higher effects observed at 9-24 months compared to 36 months and beyond.

If you join a dietary program, expect the biggest benefits in the first two years. To maintain these benefits long-term, you need to connect the program's lessons to your daily life and ongoing support systems, as the structured intervention's effect fades after 3 years.

Moderate or severe gastrointestinal (GI) adverse events during GLP-1 RA treatment are associated with a higher hazard of discontinuation and a lower rate of reinitiation.

GI side effects are a common reason for stopping GLP-1 RA. If you experience moderate or severe GI issues, talk to your provider about management strategies. These side effects are linked to higher discontinuation rates, but they can often be mitigated to help you stay on the medication.

Intermittent empagliflozin administration (up to 14 days/month) improves dietary self-management and reduces energy intake in type 2 diabetes patients, achieving HbA1c and weight loss outcomes equivalent to daily administration.

For type 2 diabetes patients struggling with daily medication adherence or dietary control, an intermittent empagliflozin regimen (10mg, up to 14 days/month) may be a viable strategy. This approach allows patients to take the medication on days they perceive their diet was poor, potentially improving their overall dietary self-management and motivation. Clinical results (HbA1c and weight loss) were equivalent to daily dosing, suggesting that this flexible approach can maintain efficacy while reducing the burden of daily medication.

In emerging economies like Vietnam, the rapid expansion of modern retail and increased availability of ultra-processed foods (UPFs) drives a shift toward unhealthy dietary patterns, contributing to rising obesity and diabetes rates.

For policymakers in emerging economies: Simply having traditional markets is not enough. You must actively regulate the expanding modern retail sector (supermarkets/convenience stores) through labeling, marketing restrictions, and fiscal incentives to ensure healthy food remains affordable and accessible compared to ultra-processed options.

Experts prioritize communication, education, and voluntary standards over strict regulatory constraints (like taxes or advertising bans) when designing food environment policies.

Policymakers should not rely solely on education and voluntary standards. To effectively combat the rise of UPFs, they must implement stricter regulatory measures like taxes and marketing restrictions, despite perceived feasibility challenges, as these are proven to be effective in other contexts.

Long-term adherence to a Low-Carb High-Fat (LCHF) diet is difficult for most patients, leading to decreased efficacy over time compared to low-fat diets, although it may offer short-term benefits for diabetes management.

If you choose a low-carb diet, be aware that sticking to it strictly (e.g., <30g carbs) for more than a year is very difficult for most people and may lead to weight regain or increased LDL cholesterol. Focus on finding a carbohydrate level you can maintain socially and psychologically for years, rather than aiming for extreme ketosis if it causes you to quit.

Educational documentaries can significantly increase intentions to reduce meat consumption, but these intentions do not predict actual consumption.

While watching a documentary might make you *want* to eat less meat, it won't necessarily make you *do* it. The study shows a significant increase in intentions, but no change in actual consumption. To make real changes, focus on practical, small-scale adjustments to your environment and habits rather than relying on informational interventions.

Time-restricted eating (TRE) with a 10-hour window, when combined with caloric restriction, leads to greater lean mass loss compared to caloric restriction alone.

If you use a 10-hour eating window to lose weight, be aware that you might lose more muscle than if you just counted calories without a time limit. To counter this, ensure you are eating enough protein within your 10-hour window, perhaps spreading it out evenly.

Higher acculturation levels moderate the effectiveness of the MyPlate intervention, with the most acculturated participants showing the greatest reductions in waist circumference.

If you are recently immigrated or less acculturated to US food systems, standard MyPlate advice might be less effective for reducing belly fat. You may need more personalized guidance that integrates your traditional healthy foods with US dietary guidelines.

Meal timing, specifically higher-calorie breakfasts and overnight fasting, helps prevent obesity.

Eat a larger breakfast and finish eating earlier in the evening. This aligns with your body's natural clock and may help prevent obesity. Avoid skipping breakfast and late-night snacking.

Personalized Type 2 Diabetes management, which tailors pharmacotherapy to individual phenotypic, clinical, and personal factors, improves medication adherence, patient satisfaction, and health outcomes compared to rigid algorithmic approaches.

Work with your doctor to build a treatment plan that fits your specific health profile (like kidney or heart status) and your personal life (like fear of hypoglycemia or preference for pills vs. injections). This collaborative approach leads to better adherence and fewer complications than following a generic, one-size-fits-all checklist.

Personalized glycemic targets should be less aggressive in older patients or those with reduced life expectancy to minimize hypoglycemia risk and polypharmacy burden.

If you are older or have other serious health conditions, your doctor may aim for a higher blood sugar target to keep you safe from dangerous lows and side effects. This focuses on your quality of life rather than just a number.

Home-based training (HBT) is a viable alternative to supervised exercise training (SET) when SET is not feasible, provided it is structured and monitored.

If you can't go to a supervised program, start a home-based walking plan. Walk 3 times a week, starting with 20 minutes and building up to 60. Use a pedometer or smartwatch to track your activity, and consider logging your pain levels. This is just as effective as supervised exercise if you monitor yourself.

A 3-year worksite lifestyle intervention significantly improves cardiovascular health metrics in middle-aged adults, but the effect attenuates to non-significance after the first year when intervention intensity is reduced.

If you are implementing a lifestyle change for heart health, expect significant benefits in the first year if you engage actively with coaching and tracking tools. However, do not assume these benefits will persist automatically if you stop engaging with the program after the first year. To maintain gains, you must either continue with periodic check-ins or independently maintain the high level of behavioral effort established during the initial intensive phase.

A lifestyle intervention is effective in improving cardiovascular health metrics in individuals with low baseline subclinical atherosclerosis, but ineffective in those with high baseline subclinical atherosclerosis.

If you have significant underlying cardiovascular disease (high subclinical atherosclerosis), standard lifestyle advice (diet, exercise, no smoking) may not be enough to improve your health metrics. You likely need more intensive, specialized medical or behavioral interventions. Do not assume that standard lifestyle changes will yield the same results as they do for healthier individuals.

Adherence to low-carbohydrate (LCD) and very low-carbohydrate ketogenic diets (VLCKD) is significantly lower than adherence to vegan or vegetarian diets, with attrition rates often exceeding 40-60% in long-term trials, leading to a convergence of metabolic outcomes between diet groups over time.

If you are trying a low-carb or keto diet for diabetes or weight loss, expect that sticking to it is the hardest part. Many people drop out or stop strictly following the diet within a year, causing their results to look like those of people on other diets. To succeed, focus on sustainability over perfection. If strict keto (<50g carbs) feels too restrictive or socially isolating, a moderate low-carb approach (<130g carbs) might be easier to maintain long-term, even if the initial weight loss is slower. The key is not the specific number of grams, but your ability to keep the diet going.

Pre-contest bodybuilding preparation is associated with worsened psychological status, including increased fatigue, mood disturbance, and perceived stress, alongside reduced recovery.

Be prepared for mental fatigue and mood swings during your cut. This study shows that total mood disturbance increases by 35% and fatigue by 23% during the pre-contest phase. This is likely due to the combination of low energy availability and high training stress. Prioritize sleep and stress management strategies, as perceived recovery drops significantly.

The current food environment in Dutch supermarkets and out-of-home chains predominantly promotes energy-dense, nutrient-poor products, with 79% of supermarket assortment and 90% of out-of-home assortment falling outside healthy dietary guidelines (Schijf van Vijf).

Recognize that the default food environment is engineered to promote unhealthy eating. 79% of supermarket items and 90% of out-of-home items do not meet basic healthy dietary guidelines. To eat healthily, you must actively seek out specific healthy items rather than assuming they are the norm, as they are often less promoted and less accessible than unhealthy alternatives.