Answer:
To avoid leaving to get food
Explanation:
When it comes to studying, time management is very important. You want to avoid activities that will draw your attention away from the material you need to master. By bringing snacks to his study sessions, John avoids leaving to get food. This means that he can eat anytime he wants and doesn't need to stop studying in order to go and buy some food. Not being hungry and not having distractions may help him concentrate better and contribute to his success.
