Starting the Revolt against Junk Food at Home

I am starting a revolt against junk food.
Too often, I hear, its okay to let them have some junk once in a while (about the kids, about my kid).
ITS NOT OK!!!!
He's addicted to junk food, and like an addict when he gets his hands on a little, he wants a lot.

My son is chubby.
He is in the higher percentile for weight.  I thought I was doing fine by him to let him have a candy once in a while.  Then I found out how much he was getting at preschool, and daycare and Grandma's.  No wonder he has gotten chubby!

I removed the sugar in the house.
I use dates to sweeten things.
I will buy no more processed cold cereals.
 This morning my son had a small serving of blueberry oatmeal with Chia seeds in it and a little soymilk and we shared a smoothie with blueberries, banana, and spinach.

He starts kindergarten in the fall.
I am nervous about the conversations with the school about
NOT using M&Ms to count with
NOT giving him suckers on the bus.
NOT giving him candy, cookies, "fruit" snacks.

Let the other parents roll their eyes,
Let the teachers think I'm mean,
Let my extended family think I am a health-nut-wack-job,
Let my co-workers laugh at my really big salads.

I told my son that vegetables have super-powers.
I do believe this is true.
At first he asked, "what kind of powers?  Can I do this?" (doing a spider-man wrist flick)
I said, "no, but they have the power to help you from getting sick"
He says, "but sugar has the power to make me sick?"
He's catching on...