High acid diet is not good for you (this incluces dairy).Your body has a natural acid/alkaline balance. Medications, sugars, poor diet and stress can all make the body more acidic.
When the body is acidic, yeast, bacteria, viruses and cancer can thrive. And conversely, when the body is alkaline, foreign bacteria, viruses, yeast and cancers can not live.
Our body has a natural balance called homeostasis. When we are too acidic, minerals like calcium are leached from our bones to help alkalize the body. Another way our body tries to protect us from acid is to buffer it with fat and store it in the body.
Luckily, there are ways to naturally boost your PH which should stay at 7.365. Eating more green vegetables and less sugars, meat and dairy. There are also some great supplements out there that are alkalizing as well.