January 7th, 2012 
The human body has two essential components that enable it to dispose of waste acid resulting from its operation: it is the kidneys and lungs.
Some acids are difficult to remove, and it takes care of the kidney. This work is long and difficult and disposal is limited in quantity. Therefore, avoid overloading.
Other acids are easier to remove because they are transformed into a substance that has the ability to “evaporate”. This form of disposal is limited to the lungs. It’s a job a lot easier than the previous one, which is coupled with respiration.
It is important to understand these mechanisms because it is an important key in practice: are excreted through the lungs acids called “volatile”, mainly from the degradation of plant proteins. fixed acids “non volatile”, mainly from animal protein degradation are eliminated by the kidneys.
This is the case of proteins. There is no question as to remove their constituent amino acids are essential for the proper functioning of the body but it is important to ensure intakes. Amino acids from animal protein (meat, chicken, fish …) contain strong acids (sulfuric and phosphoric) and purines that provide their own acidic compounds (uric acid). They are highly acidifying.
Amino acids of plant proteins, including cereals are more easily eliminated. Coffee (caffeine), black tea (caffeine) and cocoa (theobromine) are rich in purine, and are classified as acid-forming foods. It is the same for white sugar, bleached wheat flour and its derivatives, fats processing.
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