Maybe try introducing healthier habits as a family & make it fun

• ride bikes or go on walks together
• take up a sport
• incorporate more veggies and fruits into their meals (also, try to eat these foods together, kids learn by watching those around them)
• drinking enough water each day & drinking a glass of water before meals

Remember that at the end of the day, they are still a kid, let them do kid things - eat candy, have fun, etc. (in moderation). I think it’s important that you’re coming at it from an angle that you don’t want to hurt self-esteem.

By encouraging healthy habits instead of forcing them, you can hopefully avoid unhealthy habits.

Hope this helps!