Despite many claims to the contrary, the blood type diet does not have any actual known scientific basis. This diet is based on the theory that initially all human beings had only one blood type, type A. Human kind was mostly eating meat during their initial forays into existence. With that thought in mind it is believed that nowadays people with blood type A should do low carb diets. Next, human kind mastered agriculture and started eating flour based food products.
The adherents to this diet claim that this is when the B blood type appeared. Therefore, low protein diets are recommended for people with the B blood type. Where this leaves blood type O, or mixed blood types is anyone’s guess. Typically, blood type diets brings poor results at just minus 2-5 kilo. These people are lucky. In many instances these diets show no result at all.