PH Miracle一书的作者Robert Young下面的这番叙述曾给过我本人许多饮食与健康关系方面的启示，希望通过阅读你也有所领悟和收获。
Just our body temperture must be maintained at 98.6 degree Fahrenheit, our blood is ideally maintained at 7.365 pH - very mildly basic. ( A mainstream doctor would accept up to 7.4, but that's problematic, as we'll see later.) Different areas of the body have different specific pH requirements, but the blood needs to stay within a pretty tight range. It's a reliable indicator of internal conditions in genral. Maintaining the alkaline pH of the body fluids, including blood, urine, and sliva(and even , though you don't generally measure these, tears and sweet), is critical for good health. Prime among these is the blood.
Physiological diease and dis-ease are almost the result of too much acid streesing the body's pH balance, to the point where it provokes the body into producing the symptons that we call disease. (More about this confusion later.）Disease also be simply the toxic effects of an external source, such as exposure to air pollution from smoke, cars, or planes, or posions from a toxic dump site, but that is much more rare. Symptoms can be the expression of stress, but they can also be a sign of the body's effort to balance it. Depending on the level and extent of the stress, symptoms may not be obvious or even noticeable. The kicker is that excess acid is something we do to ourselves, thanks to the choices we make. The good news , then, is that once we recognize that fact, we can make different choices. But we must be ready to take resposibility for our acidic life style and dietary choices before we'll be able to make healthy changes.
All of the body's regulatory mechanism (including breathing, circulation, digestion, and glandular function) work to balance the delicate internal acid - base balance. Our bodies cannot tolerate extended acid imbalances. Acidity reveals itself in our bodies in seven stages：
Loss of energy
Sensitivity and irritation(as in IBS)
Mucus and congestion
Harding of soft tissue
Degeneration (cancer, heart disease, stroke, diabetes...)
In the early stages of the inbalance, the symptos may not be very intense and could include such things like skin eruptions, headaches, allergies, colds and flu, and sinus problems. As things get farther out of whack, more serious situation arise. Weakened organs and systems start to give away, resulting in dyfuctional thyroid glands, adrenals, liver, and so on. If tissue pH deviates too far to the acid side, oxygen levels decrease and cellular metabolism will stop. In other words, cell die. You die.
So a decling pH just can't be allowed. To prevent it, when faced with a lot of incoming acid, the blood begins to pull alkaline minerals out of our tissues to compensate. There is a family of base minerals particularly suited to neutralizing, or detoxifying, strong acids, including sodium, potassium, calcium, and magnesium. When these minerals react with acids, they creat much less detrimental substances, which are then eliminated by the body.
Now, a healthy body maintains a reserve supply of these alkaline minerals to meet emergency demands. But if there are insufficient amounts in the diet or in the reserves, they are recruited elsewhere, and may be leached from the blood (as with sodium or potassium), the bone or cartilage (as with calcium), or muscles (as with magnesium)-where they are, of course, needed. This can easily lead to deficiencies-and the many and varied symptoms that come with them.
That's just the tip of of iceberg. If the acid overload gets too great for the blood to balance, excess acid is dumped into the tissue for storage. Then the lymphatic (immune) system must neutralize what it can-and try to get rid of everything else. Unfortunately, "getting rid of" acid from the tissue turns into mean dumping it right back into blood, creating a vicious cycle of drawing still more basic minerals away from their ordinary fuctions and streesing the liver and kidneys besides. Furthermore, if the lymphatic system is overload, or its vessels are not fuctioning properly (a condition often caused by lack of exercise), acid builds up in the connective tissues.
This imbalance in the blood and tissue pH lead to irritation and inflammation and sets the stage for sickness and disease. Acute or recurrent illness result from either the body trying to mobilize minieral reserves to prevent cellular breakdown or emergency attempts to detoxify the body. For example, the body ,may throw off acids through the skin, producing symptons such as eczemma, acne, boils, headahes, muscle cramps, soreness, swelling, irritation, inflammation, and general aches and pains. Chronic symptoms show up when all possibilities of neutralizing or eliminating acids have been exhausted.
When acid wastes build up in the body and enter the bloodstream, the circulation system will try to get rid of them in gas or liquid form, through the lungs or the kidney. If there is too much waste to handle, they are depositioned in various organ systems, including the heart, pancreas, live and colon, or stored in fatty tissue, including the breasts, hips, thighs, belly-and brain. We know these" deposits"by names such as polyps, fluids, cysts, acid crystals, tumors, warts, bumps, growths, masses, blemishs, moles, blisters, sacs, and so on.
This process of acid waste breakdown and disposal could also be called the aging process. Ultimately，it will lead (in the seventh stages of acidity) to degenerative disease, including cancers.
And all this caused by dietary, metabolic, and environmental acids.(Dietary acids are from what you eat and drink; metabolic acids are created as your body processes what you eat and drink, and turns it into energy; environmental acids come from your surroundings, things like the synthetic pillow you may be sleeping on or the smoke you breathe in from the factory a mile or two from your home.)
On the other hand, healthy diet alkaine blood and tissues creat a healthy body.
以上叙述摘自PH Miracle (page 12-15).