" If we consider the last forty years of research as a test of Mayer’s hypothesis that physical activity induces weight loss or even inhibits weight gain, it’s clear the hypothesis leads nowhere meaningful. What Mayer initially insisted had to be true, so much so that he publicly accused the “enemies of exercise” of propagating “pseudo-science,” had devolved over the intervening decades into an analysis of whether the prescription of an exercise program would inhibit weight gain by three ounces each month or accelerate it by two. "

― Gary Taubes , Good Calories, Bad Calories: Challenging the Conventional Wisdom on Diet, Weight Control, and Disease