Food Unwrapped jets off to find out the best foodie hacks, tips and tricks to help you feel great on your summer holiday. Jimmy Doherty discovers the truth about crash diets, reveals what it really means to stay fuller for longer and explores whether astronauts could hold the key to weight loss. Kate Quilton delves into the multi-million-pound collagen drinks market, and finds out how shots of the liquid claim to boost your skin's appearance. In Valencia, Matt Tebbutt checks out tiger nut milk, Spain's secret summer-friendly superfood. And Dr Helen Lawal investigates whether popping weight-loss pills can help summer slimmers.