"eat healthy food as much as possible."

I usually stop, if my body signals me I had enough.

(might seem like pedantery, but I know some people do believe it literally, that it is healthy to just fill themself up with "healthy food", but it is not).

I think the commenter meant such that as much as possible of your diet consists of healthy rather than unhealthy food — NOT as great a quantity as you can take in.