Nov 28, - Teenagers are smart enough to appreciate the benefits of a healthy diet, but they are also easily tempted by fast and tasty junk food. The following foods will help: breakfast cereal with milk and fruit. dried fruit and nuts. yoghurt and fruit. English muffin with peanut butter and honey. banana and peanut-butter sandwich. fresh fruit smoothie with milk and/or yoghurt. low-fat muesli bar. small muffins made with oats or wholemeal flour and fruit or.