I have a relative who is a registered dietician. She is the most down to earth mom I know - she doesn't follow any special diets in her house. She is very old school - says that if you eat properly (moderation and simple) you never have to think of this stuff. You'll get the nutrients and vitamins in. She said it's just when you switch to processed foods and prepackaged foods and let that be the majority of your diet - that's when there are problems. A little in moderation ... and you never have to worry about this stuff.
That's pretty much my practice too. I grew up in a household that loved food and were active. No one in my family had weight issues or even thought about it. You ate so that you could go out and play in the park. I guess that's how I view it today. It's energy. So when my kids play hockey, they eat accordingly.
My kids have to eat when they get home. Like another mom, we have stuff used in lunches (granola bars, etc.) that is strictly for lunches - otherwise it would get eaten up. So they can have a sandwich when they get home, fruit, pitas and humus, cheese, a boiled egg. Mine go in and get it themselves. Little ones I put out a few things to nibble away at.
When my kids were little, and starving while I made supper, I put out cut up fresh veggies because that's how they liked vegetables. They wouldn't always eat them cooked. I discovered that kids, when starving, will eat just about anything - so I will chop up an apple or cut up celery sticks. So I always offer stuff like that first when they are ravenous. Clementines. Raw cut up cauliflower. So when I'm making supper, and they stream through hungry, that's on my counter. Then I don't have to worry if they didn't eat their apple at lunch.
I am a baker. Not so much a cook unfortunately! So we always have a supply of baked goods in my house. Moderation. You have them as a treat. Not if you're ravenous. Same with chips, etc. They are for movie night. Popcorn .. snack to take when we watch hockey games. Or if it's a snow day and we're stuck inside. Hot chocolate and cookies after the rink. Ice cream hot day playing outside or at the park. I never really think of it - but treats are part of fun times for us. They are not required .. but we enjoy food.
I don't think I've ever really said no to my kids if they were hungry. Maybe if it's very close to a meal, but if they want to start their salad (are that hungry.. ) go for it.
If someone said to me that I could have one treat a day, I'm not sure how I would react. Some days (PMS) I need (ok want..) my cookie with my tea. And if I want another one in the afternoon ... then I will :) Some days, I'm not so much in need of treats. Some days, I want carbs. Other days, protein. My kids are similar. I think day by day our needs change ... and so does our schedule. I know when we're on vacation we treat ourselves more. Same if we have friends over .. so I think I am more flexible than strict about this stuff. Honestly, if we never stop and think about it, but get the vitamins in ... I'm ok with it. The kids are average sized (maybe on thin side) and healthy - healthy is what I'm looking for.