Nah I am surprise with your question jimmythejock :)
Halal foods are those foods which are generally good for the health, the benefits that can get on those foods are greater than harm it might give on the body. And the Haram (not permissible) foods are the exactly opposite of the Halal or permissible foods. The disadvantages it may give is greater than its advantages like drinking wine and eating pork and several others.
Muslims are strict when it comes to food because it affects the conduct of a muslim in performing religious obligations.that must be fulfilled everyday.
Moreover, almost all Haram foods were scientifically proven that those are not really good for the body, either it drives a person lazy, get some illnesses from it or be addicted to it, which in either way are not good for the person's self and daily life.