I am also type A and the macrobiotic diet is the best diet I've found. I thought I was dying, but it turned my health around. It is very close to the blood type A diet and made a huge positive impact on my health. I also was overun with candida and it was still the best thing I did. So it must be due to blood type needing the whole grains, beans, vegetables. Meat and chicken did constipate me also.