When you say the body is meant to be alkaline, what exactly do you mean by "body"? Because there is no way every aspect/part of the body is supposed to have a pH above 7.0, and definitely not the entirety of the gastrointestinal tract, which is supposed to be predominantly acidic (although parts of it are alkaline). That is why a healthy intestinal tract is supposed to be colonised by lactic acid forming bacteria - to maintain the acidity and keep candida in check.
An alkaline pH in the intestines allows candida to morph from it's planktonic yeast form into its mycelial/fungal form. The genitals and skin are also supposed to be slightly acidic. That is why you should never regular alkaline soap to wash your body. Even my Dr told me you should really only use the classic bar of soap to wash your hands, because it strips the protective acid mantle off your skin which actually acts as part of the innate immune system.
These are the details that people often overlook but need to understand, especially here on this forum. It's irresponsible of you to promote the idea that alkalinity in the body = good and acid = bad. It's not that simple. Yes the blood is supposed to be alkaline with a pH of about 7.4. It is true that people do suffer from metabolic acidosis but only under extreme circumstances, such as in respiratory or multi organ failure. However acidity also plays an important role in the human body.
I don't agree with the way Pokermaniac responded, but please make sure you know your subject before you start posting and making broad based generalisations without any scientific basis.
And please read these studies and any others that you can find that are relevant: