primitive" peoples all over the world appear to intuitively understand this balance.
From this chart we can begin to understand why civilization's diet is so acidic. Western civilization's diet consists mostly of roots, seeds, and animal muscles. This is translated into a burger (the bun is seeds, the meat is a muscle) and french fries (roots). This is translated into a fancy steak (muscle), potato (root) and peas (seeds). The standard rice and beans dish is nothing more than seeds (acid-forming).
When one has this awareness, it becomes easy to determine how lacking civilization's diet is in green-leafy foods. The only green-leafy food that is eaten seems to be commercial iceberg lettuce grown in mineral-deficient soils. To reverse an acidic condition, one should eat 1-2 organic green salads each day and drink a green vegetable juice and/or a juice containing a green superfood powder.
What we are looking for is a balance between acidity and alkalinity. Generally, most people are too acidic from eating the acid-forming "root, seed, muscle" diet throughout their lives. People in this category should eat more alkaline foods. Once a person has established a balance and can "feel" or "instinctively know" when one is too acidic or too alkaline, then it becomes important to eat acidic and alkaline foods in a balance to each other as needed. If you are not sure what your body needs, generally err on the side of eating more chlorophyll-rich green-leafy vegetables.
Many people have a prejudice against acidic foods. Remember, if a food is acidic, that is not a bad thing. We need to eat foods that are both acidic and alkaline - and we require these in a balance to each other. Neither is more important than the other. However, alkaline food is usually more important in the beginning years of changing our eating habits.