Hi Jen,
You might give him a lot of beans, soy and other protein rich products and I suppose he east eggs and milk ? If yes, you have nothing to worry about - except those sweets LOL ; ). My sister's son did not like meat when he was a toddler, later on he started eating it without a problem - kids go through all kind of weird stages with food, don't worry too much. As long as he is healthy and happy he is doing fantastic ; ) !!!