Is it normal my boyfriend pigs out when he's stressed

When my boyfriend is stressed or nervous he eats massive amounts of food, like grossly large amounts of food, until he pukes. I know of stress eating, but this seems sorta extreme doesn't it? I'm talking like 4,000-6,000+ calories in a sitting, whole boxes of cereal/donuts/pasta, entire pizzas/cakes, really unhealthy junk foods, stuff like that. He's average build, so it's not like he's getting fat from this, it's just these short intervals of gluttonous eating.