An unbalanced diet is normally responsible for the change in body pH, almost sure to be a lack of the 8 essential amino acids.
One needs to understand metabolism and the need for protein amino acids, that are essential to life, a lack of amino's will see the body swing one way or the other....
Drinking Vinegar beverages is a ideal neutraliser of acids and alkaline...The stomach acid being approximately pH 2 and drinking vinegars being around pH 3.5, when you consume vinegar, the stomache acid will rise above pH2 , so vinegar does have an alkaline effect on stomache acid, if one is alkaline above pH 7.5 then drinking vinegar will reduce it...
The 8 essential acids are the most important to reduce pH and sugar in the blood, so always drink vinegars just after a meal for best results.
ACV! You can take a spoonful in water just after your meals, for the best health benefits from vinegar, this will also reduce the sugar spike in the blood, after you have consumed carbohydrates, carbs, are converted to glucose....there are two types of carbs, simple carbs, which go straight to the blood and complex which are more healthy and have to be digested. ACV hasn't any amino acids, try to get a brown rice vinegar, that will supply all the essential amino acids for the metabolism.