If you make your blood alkaline it will kill you. Same if you make it acidic. Your blood should be nearly pH neutral, and it posesses a chemical mechanism (call buffering) that keeps it from going too high or too low.
This whole alkaline body thing is pure pseudoscience. Trying to push various bodily fluids' pH into ranges they should be is dangerous.
There are no easy or simple answers to any of the problems of disease. When someone suggests a single cure or source for all disease then they are simply and demonstrably wrong. There is NO science whatsoever that supports the notion that disease is caused by the body being 'too acidic' (a concept that is more or less meaningless unless applied to specific fluids in the body).
See the article below.