Sorry, I don't follow. Are you extending the metaphor or answering literally? Candy is the fossil fuel-intensive lifestyle and eating vegetables is choosing to cut back.
I thought candy was delicious CO2 intensive food. Not a complete lifestyle.
Although, food is just one part of the equation. I've never said diet is the only change necessary to make. A person in the first world would do more by not using AC and heating than switching to a different diet, so one might optimize there. Although, not many want to optimize there, so it's easier to change the diet if they wish to lower their footprint.