Fruits like Apples, plums are 100% Alkaline they like Rain water which is acidic.
If he lived in Germany.... German's they have a bad habit of burning coal in neighbor hoods to heat water. Our curtain in the kitchen windows would turn black from the suit as the coal burning boiler was in our back yard. Maybe that caused his lung cancer.
Unless he was drinking Alkaline water.. water made to be Alkaline naturally or induced with technology then it does not matter what he did or did not eat unless his diet was an Alkaline you are still acidic.
German love to drink carbonated water. Acidic at 2.5 ph. Why they love that bubbly stuff I dont know but it is poison.