Let's analyze why the idea that proteins always "acidify the body" is an oversimplification and incorrect.
How proteins affect acid-base balance
Proteins are made up of amino acids — organic compounds, each with a unique structure and chemical properties.
From the perspective of their influence on the body's acid-base balance, amino acids are conditionally divided into three groups:
Acidifying amino acids. These are primarily sulfur- and phosphorus-containing amino acids, for example:
These acids enter the bloodstream and temporarily shift the plasma pH towards the acidic side until the buffering systems (mainly bicarbonate) and kidneys neutralize and excrete them.
Alkalizing amino acids. Some amino acids contain side chains with nitrogenous and alkaline groups, for example: glutamine, arginine, lysine, alanine.
These compounds consume protons (H⁺) during metabolism or release ammonia, which binds with protons to form neutral or weakly alkaline compounds (such as urea or glutamate).
Thus, they contribute to alkalizing the internal environment of the body.
Neutral amino acids. Some amino acids have little direct effect on the acid-base balance but can participate in the synthesis of metabolites that indirectly influence the buffering systems.
Why complete protein is balanced nutrition
"Complete protein" provides the body with both acidifying and alkalizing amino acids, ultimately forming a natural metabolic balance.
How the body maintains blood pH
The body strictly regulates the plasma blood pH within the range of 7.35–7.45. The overall acid-base balance is controlled by:
- Blood buffering systems (bicarbonate buffer, protein buffer, phosphate)
- The kidneys, which excrete excess acids or bases
- The lungs, which regulate CO₂ levels (affecting carbonic acid levels)
Thus, no food can radically "acidify" the body if the organs are functioning normally.
Conclusion
The idea that "all proteins acidify the body" is a myth based on a superficial understanding of metabolism. In reality:
- Only a portion of amino acids have an acidifying effect.
- Alkalizing amino acids balance this influence.
- Complete proteins support homeostasis rather than disrupt it.
Therefore, with adequate, balanced protein nutrition, the body maintains a healthy acid-base balance naturally.
