Your friend eats too much junk food, how would you be able to bring about a change in her/his attitude towards food?
I would make my friend aware of the harmful effects of junk food. This creates a cognitive dissonance between the cognitions that "junk food is harmful" and "I eat junk food". To reduce this dissonance, my friend would likely change their behaviour and stop eating junk food.
I could also use the two-step attitude change method. I would first show positive feelings towards my friend, and then change my own habit of consuming junk food by substituting it with a health drink. Seeing me change my behaviour, my friend is likely to imitate me and change their attitude.
If my friend constantly falls ill because of eating junk food instead of proper meals, they are likely to develop a negative attitude towards junk food and a positive attitude towards healthy food.
Explanation
The answer uses three concepts from the textbook to explain attitude change: cognitive dissonance, the two-step attitude change process (using oneself as a role model), and learning attitudes through punishment (falling ill). It strictly adheres to the provided context.