T1, E2: Six Brits, all on a personal weight-loss journey, travel to Tonga, which has one of the world’s highest rates of obesity. There they meet Ofeina who is fighting to turn around the island's obesity crisis. The group is shocked by the types of food the average Tongan eats, but a traditional diet of raw fish is not a hit. Will they manage to lose any weight by the end of the week?