Food Unwrapped kicks off 2019 with a diet special full of hints and hacks for how to beat that post-Christmas bulge. Kate Quilton hits the surf in Australia to find out if replacing carb and meat classics with popular veg and fruit-based alternatives is a good way to cut calories. Dr Helen Lawal follows nine people who've been on three of the nation's favourite diets for nine months, to uncover the truth about long-term dieting. Jimmy Doherty finds out which foods and drinks can help during endurance training, and Matt Tebbutt goes dry for a month to see if ditching booze can make him look younger.