The document discusses how human relationships with food have changed over the past couple hundred years. It explains that food was scarce for our ancestors and they had to work hard to access food. As a result, their bodies adapted to the uncertainty and they maintained a healthy weight even eating very little at times. The document also mentions a recent study where members of a test group lost 3-10% of their body weight in the first month, with some losing weight in just 10 days.