You can view eating in the modern world as a life-or-death matter. Protracted poor eating leads to unwanted weight gain that increases the likelihood of obesity, diabetes, heart disease, certain cancers, Alzheimer's disease, and depression all of which can lead to your demise.
For prehistoric man eating was also a life-or-death matter but not eventually.
Every time he needed to hunt a large animal to feed himself and his clan, it was kill or be killed. Talk about a stressful meal preparation.