I lost my taste several times but never for an extended period of time. I kept eating and finding foods that had a hint of taste, such as Wendy's Chili with their hot sauce, vanilla shakes, chicken fingers with hot honey mustard. All I can suggest is to try different foods and textures, don't just stay with the old home cooked meals, which don't appear to be working...Make a game out of it, go out and try different snacks/entres...he must eat.
Jim