Well they could be allergic to prawns (I am).
Someone would eat vomit if they suffered from a sexual fetish linked with an eating disorder. The burning and usually nauseating sensations that surround vomit could be seen as masochistic, for it does suggest a dehumanising/self-punishing aspect.
if they aren't eating they are moulting
Someone would vomit from a Gastric tube feeding because getting something shoved down your body is not a good feeling in any case.
Normally prawns would not, but it depends on the environment where the prawns were raised. If their environment is contaminated with something then they will also become contaminated.
No. It would be considered a factor of bulimia, a dangerous and potentially fatal eating disorder.
They would lack normal eating habits.
Because you suffocated while eating chocolate. ***** That's a possibility, but most likely it would be occult blood.
That's kind of a gross way to think about it, but I suppose the opposite of vomiting would be ingesting, or eating.
they would because its not their own blood and they are not yet used to the new blood
Maybe they think what you're eating looks good.
can Asthma make you vomit blood
Not at all. Shrimp and prawns are a good source of lean protein. They would fit into almost any diet that you are on. They could made to be unhealthy if they are covered in a sauce that is loaded with fat or sugar. Eat them plain or with cocktail sauce or tomato sauce... If you want sauté them use a small amount of olive oil.