You will replace them with lighter oils and whole grains. In the first few weeks, they will complain because of the different taste. However, you have watched their calorie intake and it is the same. As a parent, you will have to break the vicious processed flour and sugar habits of your children. This is not like narcotics addiction. However, when your kid complains that they are hungry it is because they are addicted to the sugars in the foods. It will take at least three weeks to wean them off of cakes, cookies and sugar cereals.