Its the intra and extra cellular fluids of the organs and tissues that should be more on the alkaline side. And that does not mean more is better. If these fluids are not in balance, that does not necessarily lead to death. It can lead to poor health.
Well a good diet is more where people have issues with. A good diet according to them consists of mostly fresh fruits, vegetables, nuts, and seeds. Very little meat, cooked foods, or grains.