That's what someone asked me the other day - she said it seems the people who care most about food have the most problems. When I was pregnant with Levi, I was working in the public schools, and I ate school lunch every day. I "cared" about nutrition enough that I bought whole wheat bread vs. white, and I tried to have a dark leafy green salad with dinner. That was about it. And yet Levi still came out with colic and reflux. My girls I ate different things, and still the same scenario.
I think having health problems leads people on a quest to find a solution. It is no fun having a baby that cries all the time. It is no fun not feeling good. Actually, I was so miserable during Levi's pregnancy. I realized if that was what chronic health problems were like I would do whatever I could to prevent them. However, I didn't really change anything in our diets too much until he was about 8 months old. Restrictive diets can be damaging to some, and not others. But I think all in all, if your body is healthy - if you have good bacteria, it doesn't matter what you eat. You can eat junk, you can eat vegan, you can eat paleo, you can eat whole foods, whatever, and your body can handle it.
Just thought I'd say that in case anyone has wondered.