By the time the live shows roll around next month, the star wants her acts to be in the best possible shape, mentally and physically, and to help this happen, all fast food is banned. Kelly will be keeping a close eye on them to ensure no naughty snacking takes place.
For advice on how to get your food balance right, the Eatwell Plate is a great at-a-glance guide that shows how much of what you eat should come from each food group. It is suitable for most people - whether healthy, overweight, meat eaters or vegetarian, regardless of ethnic origin. It does not apply, however, to young children as they have different nutritional needs.
For the rest of us, here is some very helpful advice from Sian Burton, spokesperson for the BDA: "Eating a variety of foods can help you manage your weight, improve general wellbeing and reduce the risk of conditions including: heart disease, stroke, some cancers, diabetes and osteoporosis. All you need to do is eat sensibly, choose a range of foods in the correct proportions and have a variety of foods and fluids."