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> 5 cups of coffee per day is going to get most people moving.

You could even hypothesise that people who live more hectic lives (and thus move more) are likely to drink more coffee.

Another simple approach is that the 'cultural context' of coffee drinkers, and the perception of oneself as productive, is going to lead to a more healthy nutrition & lifestyle, to fit the pattern. I believe people naturally are harmonious in their behavior.

Another explanation is that people with bad livers can't handle coffee (slow to break it down), so this is just selection-bias.