No offense, but that's complete bullshit, and the sort of tautological reasoning he's mocking. Of course you should eat "not too much" -- eating "too much" is too much!
The key word in that quote is "food", though; the "not too much" is an afterthought.
It's 7 words and you think the last 5 are not important enough to be criticized?
Not if the criticism is a blanket "this is total bullshit".