Should your eating habits be based on the red stuff running through your veins? There's a diet if you're tall, a diet if you're short, a diet if you're fat, a diet if you're not too fat, and now, there's a diet based on your blood type. But is this bloody diet worth its weight in plasma or will it go the way of so many other overnight sensations? Read on to get the inside scoop on the diet that will have you seeing red. At the heart of the Blood Type Diet is a belief that your blood holds the key to what you should eat. Created by Dr. Peter J. D'Adamo, the diet boils down to a few key eating habits, which are based on your blood type. Of course, like any smart diet, the Blood Type Diet also leans heavily on exercise and gives advice on which exercises suit your blood best. If you've got Type A Blood, the Blood Type Diet insists your body will respond best to a vegetarian diet. Since you're more likely to wind up with cancer, diabetes, and heart...