Young men today have much lower testosterone and sperm counts than men 50 years ago, and the main causes are everyday chemicals, obesity, and poor lifestyle habits.

• Men now have 50% lower sperm counts and up to 30% lower testosterone than men 50 years ago, and microplastics have been found in 100% of tested semen and testicle samples.
• Plastic chemicals like BPA and phthalates, found in food packaging, shampoos, lotions, and water, disrupt hormones; men with the highest phthalate levels have 20% lower testosterone.
• Obesity, junk food, refined sugar, and poor sleep also tank testosterone; one sugary meal can drop testosterone 20% within hours, and five hours of sleep for a week drops it 15%.
• Cancer in people under 50 is rising fast, driven mostly by childhood obesity, ultra-processed food, low fiber intake, and alcohol; 40% of new US cancer cases are linked to obesity.
• Young men are physically weaker than past generations because daily life no longer requires manual work; grip strength predicts overall health and early death.
• Practical fixes: reverse osmosis water filters, HEPA air filters at home, avoid plastic-packaged and to-go foods, eat fruit and fiber, lift weights, and skip TRT or "looksmaxing" peptides because the infertility may be permanent.

Outlook: Without big changes to diet, plastic exposure, and exercise habits, testosterone, sperm counts, and young-adult cancer rates are expected to keep getting worse.