gain than people expect , but can , indirectly , cause gain . n Q : Do I have to avoid certain foods ? n A : No . It is important that no foods be forbidden . n Q : Can my whole family adopt this new eating lifestyle ? n A : Absolutely . A problem with other diets is that you are often on your own . Moreover , I believe that a key responsibility for parents is giving our children healthy ‘ obesity-proofing ’ eating habits ( see Chapter 15 ). n Q : Do I need to buy special supplements or vitamins ? n A : No – not unless you want to make expensive urine .