Jean-Paul Sartre in one of his famous plays said, “Hell is—other people.” I think most of us might sympathize with that claim depending on the day and the person we’re dealing with. On the flip side, people can be the source of our greatest joys. His sentiment, regardless, speaks to the strong impact others can have on us. Whether we like it or not, we all live (and need to live) in some relation to others. None of us exist in a vacuum, and research on extreme isolation suggests the real hell on earth might be exactly that. So make no mistake—how people make us feel is not just the stuff of poetry and philosophy. Other people can and do influence our immediate physiology as well as our ongoing health. What does this process look like though? How does it play out in our lives? Let’s examine a few examples. (This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)