As with any question of overeating, each person has a different reason/story for their behavior. Would you call it a choice or an addiction when a person is having difficulty changing a life time habit, because of a radical change in metabolism?
As a personal observation, I was always considered painfully thin and ate as much of everything as I wanted to. This all changed about 20 years ago, when I started gaining a pound or two every month. At first I chalked it up to normal aging, and only made small changes. Then I started getting serious about it, and tried various ‘diets’ without much success.
With the onset of ‘Pre-diabetes’ my doctor referred me to a dietitian, and she worked with me on a healthy eating plan I can stick to. My downfall is not exercising, rather than overeating. I much prefer to just sit here, or do small amounts of housework. I have never been an active person, even when I was young. I was always the subject of teasing in gym class, last in everything.