Hmmmmm, that does give me something to think about (thanks for your response, btw). That's pretty much what I had read about the blood-type diet: that O's do best with low carb, and that the other types do better with a different plan. Every time I've started Atkins I have felt absolutely sick for the first three days, and that's mainly why I quit each time. Maybe I should just go a different route and see what happens.