Most blanket statements about nutrition are irresponsible and don't even make sense if you really think about them. (okay, so we all can agree that hydrogenated oils are really bad for you, but ykwim!) Not every type O or every vegetarian or every woman or every person with colon cancer should eat the same things, take the same supplements, etc. There are plenty of vegetarians out there who are type O, and are very healthy, maybe even healthier than if they were following the high animal protein recommendations of said diet. There are so many factors to consider on an INDIVIDUAL basis when considering what kind of diet to follow. And sometimes you have to change a diet that's worked wonderfully for you for years because people change. You have to consider your metabolism, your allergies, foods that just "don't agree with you," blood type could be a factor for some people so could your constitutions (kapha, vitta, dosha), and the list goes on. If the recommendations for your type work for you, that's wonderful and you should absolutely do what works best for you, your dc, your family in general, but don't believe every blanket statement that is out there, work with different ideas to incorporate a number of them and create eating habits that are healthy for you, the INDIVIDUAL.