To function at its best, the overall pH of our body must be slightly alkaline (7.39). The maximum tolerated acidification is 7.36 and the maximum alkalinization can be up to 7.42. This means that the healthy zone is between these two values.
A pH between 7.36 and 7 is a marker of pathological acidosis. A pH between 7.42 and 7.8 indicates alkalosis. Beyond these limits, life is impossible. These values are very strict.

The ideal value of 7.39 is the blood pH and to a lesser extent that of other fluids circulating in the body (lymph, extracellular and intracellular fluid). A blood pH that is one-half unit away can result in death. While urine pH can be much more variable. Measurements can go up to 6 or even 5 or 4.5 without the person actually being ill.

Each tissue in our body has its own reference pH, which allows it to perform its function in an optimal way. The ideal pH of the small intestine, for example, is 6, while that of the sigmoid colon is 8. Pancreatic juices vary from 7.5 to 8.8. The surface layer of the skin is normally 5.2 while its deeper layers are much more basic with a pH of 7.35. The process of protein digestion requires an acidic environment. This is why the pH of the gastric environment is 2. As for the acidity of the surface layer of the skin, it fulfills the role of a defense barrier by destroying the microbes that try to penetrate the body. These reference values are ideal and meet the precise conditions required for the body to function properly.

So the question is, how do we know the pH of our tissues? Since urine pH mirrors tissue pH, it is very easy to know the pH of the body with urine pH strips. This method is of course less reliable than Louis Claude Vincent's bioelectronic method, but it is easily practiced by everyone.

This simple test nevertheless gives very interesting information on the state of acidification of the soil, provided that it is repeated several days and several times a day in order to obtain an average pH. Indeed, you will notice that depending on the food you ingest, there may be quite marked variations in pH.

Why is urine pH a marker of our tissue pH?

As explained above, in order to stay healthy, it is imperative that the body's pH remains within very strict limits. Since we absorb acids, to stay within acceptable limits, the body gets rid of any excess acids through one of the main elimination routes which is the urinary system. Normal rates of acid excretion by the kidneys give the urine a pH of 7 to 7.5. If the rate of acid excretion from your urine is higher than normal, the pH measured will also be more acidic. It can be concluded that the body is trying to get rid of an excess of acids. If there is excess acid in your urine, it also means that your tissues are saturated with it. This makes it possible to draw interesting conclusions about the state of the soil, but also about the way the body metabolizes acids.

Acids irritate and demineralize tissues. These excesses of acidity are at the origin of many health problems, problems that will affect all the organic spheres and all the tissues: musculo-osteo-articular (attacks of drops, rheumatism, sciatica, arthritis, polyarthritis, osteoarthritis, osteoporosis, cramps, demineralization), skin and mucous membranes (itching, pimples, eczema, herpes, mouth ulcers, cracks...), kidneys (stones) and bladder (cystitis). This can also cause circulatory problems (thinning and erosion of the vessel walls; varicose veins), chronic infectious or immune problems (colds, sinusitis, ear infections, chronic bronchitis), migraines, fatigue, lack of energy, coldness, emotional disturbances (depression, nervousness, irritability, insomnia...) or sexual disturbances (decrease or loss of libido) and in any case, a premature global aging of the body.