The potassium and calcium found the orange are essential minerals that are left behind to balance the the body's pH.

Acid - Alkaline Diet - How to Avoid Damaging Effects Leading to Chronic Disease You might not know it...but that orange you ate with breakfast was alkalizing to your system. Let's forget for a moment that you just added some much needed vitamin C and thousands of phytonutrients to your body. The body's pH is that of its tissue and fluids, after all of the digestive processes are complete. It is little known that the the acidity of the orange itself (or any citrus fruit) has nothing to do with the residue in the body after digestion. But that orange had an acid pH, didn't it. It has been widely accepted for some time now that many chronic conditions may be caused or exacerbated by over. But did you know that you've actually taken a step in maintaining a healthy pH balance.

Minerals such as calcium, magnesium, potassium, and sodium that are extracted through this process help the body balance the pH levels against too much acidity or alkalinity.