Peer-reviewed research concerning metabolic, summarized and appraised in plain language with every source cited.
This study looked at how a lifetime of endurance exercise affects heart health and muscle strength in older men. It followed 59 men, average age 67, who had been doing…
This study set out to compare how different types of exercise affect muscle metabolism and insulin sensitivity in the short term. Twelve healthy young men did three sessions: sprint intervals…
This study looked at whether vitamin D changes how well metformin (a common diabetes drug that lowers blood sugar) can bring down prolactin (a pituitary hormone that suppresses testosterone when…
This study looked at whether a man's TyG index tracks with his risk of low testosterone as he ages. The TyG index is a simple score figured from fasting blood…
This study looked at whether a quick, low-effort high-intensity interval training routine (REHIT) could improve blood sugar control after meals and over a full day in healthy, active middle-aged men.…
This study set out to see if moderate-intensity walking could improve glucose tolerance after a night of partial sleep restriction, as high-intensity exercise has been shown to do. Eleven healthy,…
This study set out to see how swapping some animal protein for plant protein affects gut bacteria and tryptophan processing in men at risk for heart and metabolic problems. It…
This study looked at how high-intensity interval training (HIIT), where short bursts of hard effort alternate with easier recovery periods, with or without L-citrulline (an amino acid that may boost…
This systematic review set out to assess how GLP-1 receptor agonists (a class of diabetes and weight-loss drugs) affect male reproductive hormones, semen quality, and metabolic health. It pooled data…
This study looked at whether vitamin D levels are linked to metabolic health, measured by the TyG index (a score from fasting blood sugar and triglycerides that flags insulin resistance,…
This study looked at whether adding avocado and mango to the diet improves blood vessel function and metabolic health in adults with prediabetes. It was a randomized trial where 82…
This study compared two exercise approaches, high-intensity functional training (HIFT) and traditional resistance training (RT), for improving metabolic, inflammatory, and physical health in overweight men. Thirty-four men with an average…
This study looked at whether the quality and amount of carbohydrates in a man's diet affect sperm DNA damage, a common problem in unexplained infertility. Researchers compared 300 Iranian men…
This systematic review and meta-analysis looked at how combining aerobic exercise with other interventions affects metabolic, heart, and inflammation markers in men. It pooled data from 14 randomized controlled trials…
This study looked at what drives low testosterone in U.S. men, going beyond aging to include habits and life circumstances. It analyzed over 10,000 men aged 18 and up from…
This study compared two approaches to resistance training, linear periodization (a steady progression of weight up and reps down over months) and undulating periodization (varying weight and reps week to…
This study compared two forms of omega-3 supplements, structured triglycerides (STGs) and physical mixtures (PMs), to see which better boosts blood EPA levels and muscle performance. Twenty-eight healthy young men…
This study looked at how a man's testosterone and SHBG relate to where his body stores fat. SHBG, or sex hormone-binding globulin, is a protein that binds testosterone and sets…
This umbrella review (a review of other reviews) set out to catalogue what damages male fertility. It gathered 43 systematic reviews and meta-analyses published between 2000 and 2025, covering 67…
This is a narrative review (an expert summary of existing research, not a new experiment) asking whether testosterone replacement therapy (TRT) could help men with low testosterone hold onto muscle…