I don't want to read too negative but that genotyping thing on that site seems a bit laughable to me. I think the blood type diet, genotype diet, Traditional Chinese Medicine etc are all ways that work pretty well to deflect some of the negative effects of modern foods. I'm perfectly open to the idea that certain combinations of non-optimal foods are better than different combinations of the same or similar foods, in terms of negative health problems. But this doesn't get to the root of the problem, which is to replace non-optimal foods with optimal ones.