Eating just prawns?

Hi,i dont know why but all i can eat is prawns. What will happen if i just survive on prawns and nothing else. I eat a lot and i have no appetite for anything else. Can i carry on just eating prawns without any major side effects?Is anyone else like this with prawns or any type of food? If i cant have one type of food i dont eat anything. Why does this happen?I buy prawns so often, and its quick - just defrosting them then eating them straight away. I love prawns. Any ideas/comments/advice/input would be appreciated!