Nearly all fruits and vegetables (especially raw) will have alkaline reactions in the body- this includes citrus fruits and tomatoes too (
...that's beyond me as well).
Most animal protein (meat) will cause acidity in the body. Note that refined sugars and starches aren't food anyway as the body has a very difficult time digesting/using them as a nutrition source.
It is also important to know that the human body is VERY efficient at maintaining a perfect balance of pH 7.4. One must have an ultra extreme diet or other underlying disease factors to offset this balance. Hyperventilation is a type of alkalosis, and is very easily treated. Diabetic acidosis is potentially fatal, most often occurring in Type one diabetics.