Without choices, they can't make choices. Without choices they can't make good choices OR bad choices. In too many people's minds, "good" is eating what parents say when parents say (where and how and why parents say). That doesn't promote thought, self awareness, good judgment or any other good thing.
Food is for health and sustenance. Eating with other people can be a social situation, ranging (on the good end) from ceremonial to obligatory to courtesy. There's no sense making it hostile or punitive.
photo by Sandra Dodd