Hello,
I would like to help you out by recommending a moderate approach.
However, more importantly, check out Denny Waxman's book "The Great Life Handbook."
He is 30 years macrobiotic and is, in my opinion, one of the best in the country. Very solid.
Without going into too much detail, he emphasizes eating habits. Sitting down to eat (always) while NOT doing other things. Proper habits dictate what one eats. In other words, having your children develop good eating habits will immediately be a healthier choice. No matter what they're consuming.
Check out his website to order a book or take classes.
www.strengthenhealth.org
Good luck!
Lear Blitzstein