Popular in the late 1990s and early 2000s, the notion that diet should be adjusted according to blood type is not supported by scientific research, states Science Daily. Instead, the best way to maintain a healthy blood profile, for all blood types, is combining balanced nutrition with regular exercise.
In his 1997 book, "Eat Right For Your Type," Peter J. D'Adamo hypothesized that it was possible to lose weight and increase general health by adjusting diet to blood type. The blood type diet was based on the notion that humans should return to the eating patterns prevalent at the periods during which blood types evolved. Unfortunately, not only is this account of human evolution oversimplified, but there is no evidence that emulating the diets of people whose life expectancy was 25 to 30 years could actually improve the health of modern populations.
According to the American Heart Association, the best diet for cardiovascular health is one comprising a variety of fresh fruits and vegetables, whole grains, low-fat dairy products, nuts, legumes and poultry. Intake of red meat, sweetened drinks and fatty or heavily salted or sweetened foods should be limited as should the amount of saturated fats in the diet.