Browse the evidence

Administration of a novel amino acid formulation (AXA2678) containing essential and non-essential amino acids, including N-acetylcysteine, attenuates skeletal muscle atrophy and prevents intramuscular fat accumulation during short-term (7-day) limb immobilization in healthy young men.

If you are facing a period of forced inactivity (like a cast or bed rest), standard protein or leucine supplements may not be enough to stop muscle loss. A specific blend of essential and non-essential amino acids, including antioxidants like NAC, appears to protect muscle mass and prevent fat infiltration in the muscle during short-term immobilization. This is not a substitute for movement, but a mitigation strategy.

Combining a ketogenic diet with resistance training promotes fat mass reduction in strength-trained individuals, but it does not support muscle mass accretion and may impair absolute strength and power gains compared to conventional diets.

If your goal is to lose fat while maintaining your current strength, a ketogenic diet combined with resistance training is a viable short-term strategy (up to 12 weeks). However, do not expect to build significant new muscle mass or maximize absolute strength/power gains; conventional diets with adequate carbohydrates are superior for those specific hypertrophy and power goals. Monitor protein intake closely (1.6-2.0 g/kg/day) to mitigate potential muscle loss.

Low-bar back-squats (LBBS) allow for greater load lifting compared to high-bar back-squats (HBBS) due to increased hip flexion and posterior hip displacement, which shifts emphasis to stronger hip musculature and decreases the trunk lever arm.

If your goal is to lift the maximum possible weight in a squat, switch to a low-bar back-squat position. Place the bar lower on your traps (over the posterior deltoids) rather than high on your neck. This position allows you to lean your torso forward slightly, which shifts the workload to your stronger hip muscles (glutes/hamstrings) and allows you to handle heavier loads than a high-bar squat. If your goal is to mimic Olympic weightlifting movements (snatch/clean) or emphasize knee-dominant muscles, stick with high-bar.

High-bar back-squats (HBBS) are biomechanically superior to low-bar back-squats (LBBS) for replicating Olympic weightlifting catch positions and emphasizing knee-dominant musculature.

If you are an Olympic weightlifter or want to improve your snatch and clean technique, use the high-bar back-squat. Place the bar high on your traps (below the C7 vertebra) to maintain an upright torso. This position closely mimics the 'catch' phase of Olympic lifts and places more emphasis on your quadriceps (knee musculature). Do not use this variation if your primary goal is to move the maximum possible weight; use low-bar for that.

Ten weeks of high-intensity interval training (HIIT) partially restores muscle proteostasis in obese, insulin-resistant men by increasing the turnover rates of specific proteins, although it does not fully mitigate indicators of poor proteome health.

If you have obesity and insulin resistance, 10 weeks of HIIT (3x/week, cycling at max effort for 1-minute intervals) can significantly improve the turnover and abundance of key muscle proteins. While this doesn't erase all metabolic risks or fully normalize your muscle proteome, it does partially restore a critical aspect of muscle health (proteostasis) that is typically compromised in obesity.

Regular glucosamine supplementation is associated with a statistically significant reduction in all-cause mortality (15% lower risk) and cause-specific mortality for cardiovascular disease, cancer, respiratory, and digestive diseases.

This observational study suggests that regular glucosamine use is linked to a lower risk of death from various causes, including heart disease and cancer. The authors propose this may be due to anti-inflammatory effects or metabolic changes similar to low-carb diets. However, because this is not a randomized trial, it does not prove glucosamine causes these benefits; users might simply have healthier lifestyles. It should not replace standard medical care for chronic diseases.

During the pre-contest phase, bodybuilders often use low-load, high-repetition resistance training with short rest intervals to preserve muscle mass while in a caloric deficit, potentially leveraging metabolic stress.

When cutting for a competition, you can use lighter weights with more reps and shorter rests to help preserve muscle, especially if you are in a large caloric deficit. However, some athletes still prefer heavy loads. Listen to your body and ensure you are training close to failure.

Gut microbiota composition and metabolites play a critical role in the crosstalk between dietary patterns and cardiometabolic health, suggesting personalized dietary strategies based on microbiota profiles.

While general healthy dietary patterns are beneficial, individual responses vary. Future personalized nutrition strategies may involve testing gut microbiota to tailor dietary patterns for optimal cardiometabolic health.

High baseline abundance of Bacteroides cellulosilyticus predicts significant weight gain (0.65 kg) in overweight subjects consuming 10.4 g/day of arabinoxylan oligosaccharides (AXOS) for 4 weeks, whereas low abundance predicts weight stability.

If you are overweight and trying to use high-fiber wheat bran supplements (like AXOS) to manage weight, your gut bacteria matter. If you have high levels of Bacteroides cellulosilyticus, you might stay stable. If you have low levels, you might actually gain weight. Standard 'eat more fiber' advice may need personalization based on gut health testing.

Resistance training adaptations (body composition, muscle strength, and functional capacity) are significantly attenuated in elderly women with sarcopenic obesity compared to those without the condition.

For elderly women with sarcopenic obesity, standard resistance training protocols (2x/week) may not yield the same body composition or functional improvements seen in non-obese peers. To see better results, these individuals may need higher training frequencies (3x/week), longer intervention durations, or combined dietary interventions to address the underlying lipotoxicity and anabolic resistance.

Adherence to a carnivore diet (eliminating plant foods) for at least 6 months is associated with self-reported improvements in metabolic health markers, including significant reductions in BMI and HbA1c, and high satisfaction rates, despite reported elevations in LDL-cholesterol.

If you adopt a carnivore diet (eating only animal products) for at least 6 months, you may experience significant weight loss and improved blood sugar control, with high satisfaction. However, be aware that your LDL cholesterol may rise significantly, although other heart health markers like triglycerides often improve. This data comes from a self-reported survey, so individual results may vary, and long-term safety is not fully established.

Long-term Time-Restricted Feeding (16/8 protocol, 4 weeks) improves Wingate Test mean power and total work output in well-trained young men, whereas short-term TRF (1 week) yields no performance or body composition changes.

If you are a trained athlete, try an 8-hour eating window (e.g., 1 PM to 9 PM) for at least 4 weeks while maintaining your normal training and eating enough calories. Do not expect performance changes in the first week; benefits on anaerobic power (like sprinting or HIIT capacity) tend to emerge after a month of consistent adherence.

Short-term time-restricted eating (8-hour window) leads to greater loss of trunk lean mass compared to an extended 12-hour eating window, although total body mass loss is similar.

While your muscle building capacity (MPS) stays the same, you might see a small drop in 'lean mass' on body scans during the first 10 days of an 8-hour eating window. This is likely due to fluid or organ mass changes, not actual muscle loss, especially since your muscle synthesis rates are unchanged. Don't panic if your strength doesn't drop.

A 9-month intensive lifestyle intervention combining high-intensity interval training (HIIT) and Mediterranean diet counseling significantly improves fasting plasma glucose and insulin resistance in obese subjects with baseline insulin resistance.

If you are obese and have insulin resistance, a 9-month program combining high-intensity interval training (HIIT) and Mediterranean diet counseling can significantly lower your fasting blood sugar and improve insulin sensitivity. You need to commit to 2-3 supervised HIIT sessions per week alongside dietary counseling. This approach is particularly effective for those who are already insulin resistant, whereas those with normal insulin sensitivity may not see the same glycemic benefits.

Low-load blood flow restriction (LL-BFR) resistance training produces type I fiber hypertrophy that is at least equal to, and sometimes greater than, type II fiber hypertrophy, contrasting with high-load training which preferentially hypertrophies type II fibers.

To target slow-twitch (Type I) muscle fibers, use low loads (20-50% of your one-rep max) combined with blood flow restriction cuffs. Perform sets to near failure with short rest periods (30 seconds). This method can stimulate growth in these fibers as effectively as, or better than, heavy lifting, which typically favors fast-twitch fibers.

High-load resistance training (HL-RT) produces significantly greater muscle hypertrophy than low-load resistance training with blood flow restriction (LL-RT with BFR) in upper limb exercises.

When training upper body muscles (like biceps or shoulders) with blood flow restriction, you may not get as much muscle growth as you would with heavy weights. If your goal is maximum upper body size, high-load training might be more effective than BFR. However, BFR is still a viable option for rehabilitation or when heavy weights are not possible, just expect potentially smaller gains compared to heavy lifting.

Weight loss of 20% or higher with newer GLP-1RAs raises concerns for nutritional deficiency and sarcopenia, necessitating monitoring similar to post-bariatric surgery care.

If you are losing a lot of weight (20% or more) on a GLP-1RA, ask your doctor about monitoring for nutritional deficiencies and muscle loss. You may need a dietitian to help you ensure you are getting enough protein and nutrients, similar to post-bariatric surgery guidelines.

Bariatric surgery induces substantial and durable weight loss in adults with severe obesity, with 89.3% of patients achieving ≥20% weight loss in the short term (0-9 years) and 81.2% maintaining this loss in the long term (10-24 years).

For individuals with severe obesity (BMI ≥40 or ≥35 with health issues), bariatric surgery is the most effective method for achieving and maintaining significant weight loss. While lifestyle changes are crucial, they rarely result in the >20% weight loss seen with surgery. Surgery provides durable benefits for over a decade, making it a viable long-term solution for severe obesity.

EULAR guidelines recommend early and aggressive screening and management of traditional cardiovascular disease (CVD) risk factors and metabolic syndrome components for all patients with rheumatoid arthritis (RA) and psoriatic arthritis (PsA).

If you have RA or PsA, ask your doctor about a comprehensive cardiovascular risk assessment, not just joint care. This includes checking for metabolic syndrome components (blood pressure, lipids, blood sugar, waist size). Follow EULAR guidelines which suggest aggressive management of these risks, potentially using medications like statins or newer diabetes drugs (SGLT2/GLP1) if appropriate, alongside lifestyle changes like quitting smoking and eating healthily.

Bodybuilding peak-week strategies involving carbohydrate supercompensation and acute water manipulation significantly increase the intracellular-to-extracellular water ratio (ICW/ECW) and phase angle, indicating fluid shifts from subcutaneous to intracellular compartments.

If you are a competitive bodybuilder, your peak week strategy of high carbohydrate intake combined with initial high water intake followed by a reduction can effectively shift water from under the skin into the muscles. This increases muscle fullness and definition (higher phase angle) even if your total body weight or total water volume decreases slightly. Monitor your bioelectrical impedance if possible to track this shift.

Neuromuscular electrical stimulation-based resistance training (NMES-RT) is the most robust and consistent intervention for increasing skeletal muscle mass in the paralyzed limbs of persons with chronic, motor complete spinal cord injury.

For individuals with chronic, complete spinal cord injury aiming to increase muscle mass, NMES-based resistance training (specifically the Dudley Protocol) is the most effective current strategy. This involves performing 3-4 sets of 10 electrically stimulated knee extensions twice weekly with progressive resistance. While other methods like FES cycling or pharmacological treatments exist, NMES-RT yields the largest and most consistent muscle growth, particularly in the quadriceps.

Gut microbiota composition, specifically the abundance of Blautia and Firmicutes, modulates lipid metabolism outcomes in response to personalized nutrition, with risk genotype carriers showing increased Blautia abundance associated with improved HDL and LDL levels.

Your gut bacteria play a role in how your body processes fats and cholesterol, especially if you have the FTO risk genotype. A personalized diet that increases microbial diversity (like the PN intervention did) may help improve your lipid profile by fostering beneficial bacteria like Blautia.

Dietary supplement intake in gym users is associated with a higher prevalence of slight alterations in liver (AST) and kidney (urea) function markers compared to non-users.

If you take dietary supplements regularly, get your liver (AST) and kidney (urea) markers checked periodically. While the changes found in this study were 'slight' and not necessarily damaging, they indicate that your organs are processing a higher load, and monitoring ensures you catch any trends early.

Intensive lifestyle intervention reduces total mortality and cardiovascular mortality in type 2 diabetes patients, with hazard ratios similar to those seen with SGLT2 inhibitors and GLP-1 agonists, although these reductions did not reach statistical significance in the Look AHEAD trial.

Lifestyle changes may help you live longer, even if the study didn't prove it statistically. The trend (21% lower risk of death) is similar to what powerful diabetes drugs achieve. Don't let the 'non-significant' label stop you from pursuing lifestyle changes for longevity.