Obesity is one of the biggest and costliest public health crises of the 21st century. According to the World Health Organization, 13 percent of the adult population worldwide was obese in 2016, and almost 40 percent of adults over the age of 18 were severely overweight. These numbers, startling as they are, have only increased over the past few years. In fact, data shows that obesity and overweight rates have been steadily climbing over the past five decades, from 14...