athletesbadbeetrootbestcancercarbohydratecausechangescholesterolcoffeecoldcoviddietdietsdoneatingevidencefatgivegivesgoodhealthkillknowlonglowmakemicrobiomemightmuchneedperformanceprobioticsresearchreviewsleepstudysupplementssweetenerstimetrainingukususewaterwellwillwrong