Special episode offering advice on improving health and well-being through food. New recruit John Whaite explores how vegan streaky bacon replicates the texture of meat, Kate Quilton finds out if lettuce can help people sleep, while Helen Lawal uncovers whether any foods can help protect skin from sun damage. Jimmy Doherty is in Alabama to discover why sweet potatoes count as one of the five-a-day, but regular potatoes don't. Matt Tebbutt gets to the bottom of just how much fibre people should be eating for a healthy bowel. Plus, a look at whether black garlic holds the key to staying youthful.