The Alkaline Diet Concepts

Seem to be simple.  They are don't eat grain, dairy, meat and excess salt.  The one thing I'm concerned about is that the list of foods which are claimed to be alkaline don't really seem to be alkaline.  They list tomato which I know is acidic because when I had my kidney/bladder infection it bothered my bladder very much and in order to neutralize it I had to take baking soda.  However, the principles are not bad and the food list seems reasonable.  The only thing I would worry about is a lack of protein (not complete proteins) but protein in general.