Girls, good day?? I'd love to share your experience and get some advic…

Girls, good day?? I'd love to share your experience and get some advice ?? My son is 21.09 years old and has been eating absolutely everything for the past few weeks but in the last two to three weeks something started happening, either with his appetite or I just don't know. I can't feed him properly. He really loves chicken cheese soup, but he won't eat it all at once... macaroni will be eaten and spit out, with borscht too, sometimes he throws a whole plate, sometimes he eats a couple of spoons and spits it out. He eats baked chicken wings in pieces, likes them. Corn sticks/crackers/cookies give him 2-