There is a whole…school of thought called metabolic typing which addresses this. The diet seems to be really helpful for some (and not for others). If you search on metabolic typing you’ll find several threads on the t-mag forum including one by Kelly Baggett. Also www.bloodph.com, www.healthexcel.com, and www.mercola.com.
OK remind me: how do I post a t-mag thread without including my login?
Also Berardi’s info is approaching things from a different angle then metabolic typing. In Berardi’s info (which is A standard approach), all food affects everyone the same. Metabolic typing points to the fact that the same food affects different people differently e.g. a given food may make me more acid, and you more alkaline. I’m not positive, but it may be that the metabolic typing diet addresses blood ph (thus the title of one of the sites) while Berardi’s more conventional approach reflects what things do to urine pH (which as you can guess may or may not reflect blood pH).
By the way, I posted a new topic fond on Mercolas blog. Fascinating! The main reason why I did not buy dead/shelf probiotics has now been refuted. Excellent! Now I can buy some without worries about efficiency losses because of the source` / packaging / shelf-time. :0)