Try to go for foods filled with omegas and good fats (fish,eggs,nuts,avocados, etc). You could also research
which foods complement each other(will increase the amount of certain nutrients absorbed). And don't limit your calorie intake, but go for good ones! Also research fooda that are good and less good for your blood type.
Ps.this is just a suggestion, im not a doctor, only have done some research on nutrion and health for myself. (im about to start nutrition school, its my passion.