Human blood is slightly alkaline.
In order to experience optimal health, the pH of your body should be slightly Alkaline - between 7.0 to 7.4. I found this on the following website: http://www.phionbalance.com/Discover.aspx
Milk is an acid.
Sugar is an acid.
It is neutral.
Yogurt is slightly alkaline as it smooths the mouth when people have had an spicy dish which is mainly acid. Aicd + Alkaline(base) -> Neutral
Higher is the pH value more alkaline is the fluid so Blood is more alkaline.