As a registered nutritionist myself I remember feeling frustrated when I used to see them not touching any vegetables. That is ok! You are doing a wonderful job as a parent/caregiver even serving the kids these nutritious foods. It helps to remind yourself that and just be patient. Just simply put fruits and vegetables on the table at meal time and if they don't eat it, you can show how much you enjoy it! Last night I had put corn on the table with my regular Indian chicken curry and whole wheat chapati (tortillas). They were delighted to hold the cobs in their little hands and bite into them. My 6 year old did fuss as a few got stuck between her teeth. We helped her by teaching her to bite from the side of her mouth. My 2 year old did enjoy holding it and picking at each kernel.
My kids now prefer corn on the cob rather than steamed corn that is cut from the cob or a bag of steamed corn. Its a good idea to try serving different types of the same food. Maybe they prefer a different texture or temperature of the same food. So what is the trick to get a child to eat more of what you want them to eat? Exposure Exposure Exposure!
If you haven't already noticed but by federal recommendations, school lunches should provide a fruit and a vegetable. At the local public school, I choose my child to eat the lunches provided because I see the health benefits of her being exposed to the 2 vegetables on her tray, a fruit, a protein source and a carbohydrate/starch. Honestly like many other busy parents, I don't know if I will get the chance to pack a healthy lunch for my child everyday!