Child will not eat anything but fruit

My son used to be the best eater, he would eat anything I put in front of him. A couple months ago he started refusing a lot of his favourites. He limited himself to fruit, yogurt, granola bars, pasta and chicken. I have tried to sneak veggies into his pasta and he literally picks it out and throws it.

Now for the past week he will won’t even eat yogurt, granola bars. Just fruit and sometimes throws that as well. He will only drink half of his milk. No water or juice.

I just don’t know what to do. He won’t eat anything but fruit. It’s so bad we run out of fruit within the first couple days after doing groceries. Ugh I’m scared he’s not getting the right nutrients to help him grow.