Just check it out yourself, then you may know and do not have to believe anyone else!
Use the apple with your juice and test your pH afterwards when you have to pee, by testing your pee and saliva!
Do it this way several times and then drop out the apple or what you may be concerned about and test your self to see what difference it may make and how different you may feel from doing this!
The process needs to be done repeatedly for several times at different times of the month to get correct overall info tho!
You may do this with any kind of foods which you may be eating to find out what you may want to learn about!
There is "NO" Reason for a person to have a dull moment the rest of your Life, for there is always something "NEW" to learn every day if we choose to learn!