For some odd reason many people don't get the idea of "too much" or "moderation" unless some "expert" explains the concept after charging a lot of money to impart a bit of common sense.
So here it is : eating a carrot a day can be good for your health.
Eating a 2 pound bag of carrots every day will eventually poison you.
Same for any food /drink or activity.
Find someone that runs on soft ground (IE not on hard pavement) a few miles a week and most likey that person will be in good health.
On the other find a competitive runner and by the age of 50 (much less often) they will talk about injuries and bad knees.
BTW, since this is a backpacking forum, the same goes for heavy loads (50lbs and up)
"I used to regularly carry 50lbs plus..." is a comment usually followed by "but now because of bad knees..."