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Calories a day, extra meal daily, fast food only. how many calories? 770. reporter: why? this man is paying them to. dr. samuel klein is a researcher at washington university medical school in st. louis trying to understand why weight gain leads to diseases like diabetes and hypertension and how that relates to fat in the live and muscles. at some point research on rats alone just is not enough. somebody has to eat the food. this way it has to come to people. announcer: attention overweight volunteers. reporter: a radio ad offered a cash incentive up to $3,500 depending how long it would take. once i got to work i called right away. reporter: so did nurse dawn freeman. it probably took a month reporter: to get approved? to get approved. reporter: so they ate every day from one of five restaurants until their weight went up a target 5%, 6%. dawn in eight weeks went from 170 to 186. doesn t look like a lot. but here s how it felt. for two weeks it was all ri ....