Caroline learns easy ways to combat dangerous sedentary habits, Shalin tries strength training without going to the gym, and Sandro gets sweaty for science.

In part one, Caroline convinces volunteers to road-test four popular diets: Keto, Paleo, 5/2 and Flexitarian, Sandro examines which milks are healthiest, Shalin investigates if going gluten-free is safe.

In part-two, Caroline's diet experiment reveals spectacular weight-loss, along with worrying health implications. Shalin lifts the lid on fats and oils and Sandro navigates Australia's confusing food labelling system.