I’m not surprised if you have never heard of pH balance with reference to our physical health. Eat more fruits and vegetables. We have heard this for decades. We thought (I thought) it was all about nutrition, and perhaps it was, but there was more to know. Quoting from this article, Acid-Alkaline Balance and Its Importance to Your Health, I am listing the adverse results of prolonged pH imbalance in the body. (Click the link if you wish to read the entire article.)
Impaired enzyme activity
Inflammation and organ damage
Proliferation of harmful microorganisms
Here is a link to one of many online lists of acidic and alkaline foods. (Click on the link if you wish to read it.) Not all vegetables and fruits are alkaline. All kinds of foods are listed with their acidic or alkaline ratings. Most people that suffer from pH imbalance in the USA are more acidic than alkaline, because we consume too much soda, coffee, alcohol, meat, and fish, and not enough water, vegetables, and fruits.
May we all live long and healthy lives.