How could stress possibly increase in a food-gathering population

I want to create a modern population which is adapted to stress. Meaning people could take immense mental pressures without getting into mental disorders. I thought a way to do this would be to bring stress increasing factors in the life of the ancestors of this population nearly a 1000 generations before. (These ancestors live in a forest setting) What I would like to know is
1. Whether such a thing would really make my population stress-proof ?
2. If so how do I introduce stress in the life of the ancestors (there is no fear of losing your job/failing in an exam) ?
3. How much impact could fear of ghosts have ?
Have tagged it as evolution. Couldn't think of any better/any other tag.

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How could stress possibly increase in a food-gathering population

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