You know, all I monitor is blood work. I have an overwhelming good HDL to Trig ratio...which (according to my doctor) is probably the single best measurement of what the hell is going on in your body.
My athletes eat fries and chips for lunch. They eat Trix for breakfast. They drink tons of soda. Getting them to move to protein at every meal, some fiber at every meal, and fish oil has radically changed their skin tone, athletic ability (they don't pass out in class) and mood.
So, long story short: ANYTHING you do is better than what most Americans do. In soups and stews, add root veggies, cut up three different fruits for dessert (no idea why...but kids will eat a mixture of three fruits. One, no. Three...yummee, Daddy). My kids are actually pretty good about things. My youngest is a carboholic and I am...just between you and me...worried about it long term. She thrives without carbs, but can't stop once she goes down the sugar/chocalate/sweets road.
So. Do your best. Do anything. Do.
Your kids may not thank you now, but they will get it...