Did you ever hear that John Harvey Kellogg created corn flakes to decrease interest in sex? Well, according to Keri Glassman, nutritionist and author of The New You and Improved Diet (Rodale, Dec 2012), with the amount of sugar in the cereal, he may have been on the right track. Too many sweets cause spikes and crashes in blood level, which will ultimately zap your testosterone. The amount of testosterone in men and women is directly related to libido and sex drive.