It's because kids like bright colours and advertisers know that. Try and go for the same vibrant packaging, but in food that is lower in fat and salt. This will get them used to questioning the foods they eat. If you involve kids in decision making processes it becomes more stimulating for them and provides positive reinforcement by linking a good time with the notion of healthy food. This doesn't mean being evangelistic about it all - moderation is an important lesson.
Junk food can be okay as long as it's balanced against a more healthy approach.
South China Morning Post Publishers Ltd. All rights reserved.