Habits and cravings are the devil when it comes to dieting. Let's deal with habits first. It takes a good week or two to ease into dieting. "Fast food is so easy and there's a McDonald's on every corner. The hardest thing is to develop the new habit of preparing your meals and taking them with you." The first week is the most difficult, so prepare yourself for some challenges as you abandon your usual routine. For example, you might usually go out for a sub sandwich or burger at lunch. You"ll now have to bring your food with you and resist the temptation of spicing up your meal with the Doritos in the vending machine or your usual can of Coke. It can be a real mental battle to stick to your food plan.