As you probably know already, your body has to digest whatever you eat. The typical American diet is made up of way too much acidic foods—soda pop, white bread, mayonnaise, processed cheeses, white sugar, etc.—which means our bodies have to work extra hard to neutralize those foods. And why do our bodies neutralize the food? Because it's all about balance. Our bodies know that healthy=balance. When our bodies are worn out or sick, they don't always have the strength to neutralize the acidic foods we eat, so they pull minerals from our organs and bones to help neutralize the acid. It makes me want to cry to think how much I've been overworking my poor little body. In a healthy state our diets should be 60% alkaline, and in an unhealthy state our diets should be 80% alkaline.
Your first thought may be that citrus or tomatoes would be acidic foods, but they are actually alkaline. After our bodies digest the food, whatever remains of each food is either alkaline or acidic. The remains of a lemon are alkaline, so the body doesn't have to do any extra work to neutralize it.
I'm currently working for that 80% alkaline. It's not easy, but it's possible. Today was a frustrating day, and I felt burned out from having to put so much energy into what I eat. I'm tired of it, but that doesn't mean I'm giving up, of course. I'm just tired. But my body is thanking me already.
For more background on alkaline and acidic foods, click here. The charts I've found that divide alkaline from acidic foods vary, as the Web site authors admit, but I liked the chart on this Web site in particular because it gives ranges from High Alkaline to High Acid.