For some people the obesity epidemic is easy to explain, we’re sitting around too much and eating far too many calories. Others argue there’s more to it. Casey sits down with Dr Susan Sumner, a US researcher who’s investigating what might explain the differences in obesity and weight loss between individuals. She believes that by understanding our metabolic differences, anti obesity treatments can be tailored to individuals, which could one day help combat the obesity epidemic.

Tonic TV |T-S035 I S01E10