Toddler suddenly refusing food

I have a 2 year old boy (turned 2 in late February). As of a few weeks ago, he has suddenly went from a great eater to refusing literally everything.

My oldest son started getting pickier around this age so this was expected, however, my youngest is currently on a food strike. He refuses everything, even food I know he loves, and will only eat those damn Little Bites muffins.

He has had a pretty consistent breakfast choice of either eggs or pancake puffs, to which he’s suddenly refused as well. It’s become even foods I know he loves he won’t eat. It’s not a health issue, we just had a well check with his ped. As far as I can see there’s no teeth issues, nothing.

For dinner last night he inhaled 3 slices of pizza and even ate my crust off my plate. As I write this he is at the dinner table having a fit over the SAME pizza he loved last night.

He hasn’t eaten since the pizza last night as he’s refused all food and I refuse to break down and give him muffins and donuts.

I’m at a loss and will take any advice. Do I just let him go hungry?