" Nearly everyone is suffering from a fiber-deficient diet, and that’s just based on the wimpy federal recommendations of fourteen grams per thousand calories, which comes out to be about twenty-five grams per day for women and thirty-eight daily grams for men.1273 That’s a far cry from the hundred grams our bodies were designed to get,1274 based on the diets of modern-day, isolated, hunter-gatherer tribes "

― Michael Greger , How not to diet