Health has to be a priority. You can't wait until you get sick, then decide to make a change. You may be able to bounce back, but you also may be so far down the wrong side of the track. Most you can change, but sometimes it's irreversible.
I get it. Life gets crazy and hectic from time to time. This is true. Other pressing matters will pop up. This is true. The fact still remains, you get one body and one life. Why not tret it as best as possible?