If you've ever survived for a week on fruit alone, pounded a treadmill or caught yourself ploughing lengths of the local pool in a vain attempt to make up for the excesses of the night before, don't worry, you're not alone. It seems that more and more of us are trying to convince ourselves that healthy weekday living will preserve the body beautiful, and that the weekend's fast food and alcohol fix can be wiped from the waistline as well as the conscience by using a debit-credit pattern to food, drink and healthy living.