I'm not sure how you got that from reading the article. "As an example, exercise and daily caffeine intake emerged as strong predictors of mood for one particip

I'm not sure how you got that from reading the article. "As an example, exercise and daily caffeine intake emerged as strong predictors of mood for one participant, but for another, it was sleep and stress that were more predictive, while in a third subject, the top predictors were brain function and cognitive responses to rewards."