How about a totally breast fed baby who has signs and symptoms before 1 year old?
See http://www.freerepublic.com/focus/f-news/1676158/posts?page=67#67
Sorry link doesn't work for me, but funny you should mention baby and diet, I have experienced that first hand recently.
My grandbaby was born last September 21. He was totally breast fed. He was colicky, throwing up, not sleeping well, crying, screaming, etc. They said, "Don't worry, when he is three months all that will change." Then it was four months, five, six, seven and he was still hell on wheels. Did I mention he and his Mom and Dad live in my house? You couldn't hold him without him arching his back and squirming all around.
My lovely daughter-in-law then eliminated all milk products from her diet. Voila! We have a perfect angel (as angelic a baby can be) who now naps, no longer throws up milk, and smiles at us.
I know this little story is anecdotal as to a link between diet and behaviour, but I have experienced a behaviour change too with a change in diet. I wouldn't have believed it myself.
As my genius brother says, "What you don't eat can't kill you."