Question

What happens if a community does not have enough food?

Answer 1

Malnutrition.

Explanation:

The most obvious answer would be malnutrition. Not having enough food causes starvation, and after a while death. While death is not imminent, your body will start to digest it self eventually leading to death. During this time, the "victim" will have little energy, this can lead to less repopulation as they will have no energy.