2. Episode 2

In the second of this four-part series, Jacques charts the story of the fitness industry and examines the links between exercise and weight loss. He speaks to the former Global Head of Health at PepsiCo and poses the question: why does the food industry put so much money into promoting exercise? Peretti also examines some of the pharmaceutical solutions available for weight-loss, as he tells the story of the race to find a safe and effective pill to make us thin.

3. Episode 3

Jacques Peretti continues his examination of the weight-loss industry and discovers how the World Health Organisation's recognition of obesity as an epidemic provided millions of new customers for the industry. He also explores some of the latest developments in bariatric surgery and asks how far these trends will go.

4. Episode 4

In the final instalment of this four-part series, Jacques Peretti asks why the world's population continues to get fatter, despite the fact that billions are spent on weight loss every year. He travels to America to investigate the parallels between food companies and the tobacco industry and meets the activists battling to introduce laws to tax fatty and sugary foods - and facing fierce resistance from industry.