Medical journalist Michael Mosley sets out to test ten claims about weight loss against the latest research, running each one as a small experiment rather than taking it on faith. He looks at why soup keeps people feeling full longer than the same calories eaten as solid food, and what happens in the brain after a skipped meal, using scans and simple trials to show the effect rather than just describing it. Three volunteers, musician Alex James, radio presenter Amy Lame, and actress Debbie Chazen, try the tips in their own lives on camera, giving the science a real before-and-after rather than a studio demonstration. The program moves through the ten findings one at a time, mixing lab results with the volunteers' daily routines: small changes to meal timing, portion cues, and food choice that add up to measurable weight loss over the course of filming. It plays as a practical checklist backed by evidence rather than a diet pitch, useful for anyone deciding which weight-loss advice is actually worth following.