Antibiotics and other drugs have allowed many millions of people with relatively weak immune systems or suppressed metabolisms to live to adulthood and reproduc

Antibiotics and other drugs have allowed many millions of people with relatively weak immune systems or suppressed metabolisms to live to adulthood and reproduce. This has been going on for a few generations now. I don't think it's a stretch to say various modern epidemics like obesity and cancer could be caught up in this dynamic. Broda Barnes thought this was a major factor back in the 70s. He identified himself as likely genetically defective.