I agree with myth 3 that it isn't any particular food but the amount. But if people who have a hard time following a diet can slowly stop eating certain foods they normally enjoy, they can begin to lose weight. For instance, rather than drinking a soft drink, drink water. Rather than having ice cream for dessert every night, have some yogurt or fresh fruit. Rather than having potato chips for a snack, eat some raw carrot sticks. It's basically about changing you bad habits one by one.