It was the largest single change, yes.

I have always eaten healthy food, I go for walks and hikes and bike rides regularly but I wouldn't say that I "work out".

I just developed a massive headache one afternoon, realized it was because I hadn't had my morning cup of joe, felt disgusted with myself as a result, and decided to quit drinking it altogether.

I figure that anything as addictive as that has no place being consumed daily.

I grew out of my nicotine habits and other addictive drug habits years ago for the exact same reasons.