In the cited website and video, there is a claim that lemons alkalize the body.
This is false. Lemons do not alkalize the body:
The pH of lemon juice is 2-2.6, so lemons are acidic, not alkaline.
The body uses pH buffers to avoid the pH of blood being changed:
When an acid or base is added to the body, the buffers just
mentioned bind or release H+, thereby minimizing the change in pH.
Buffering in extracellular fluid [including blood] occurs rapidly, in minutes.
So, neither acidic nor alkaline foods change pH of the blood.
Now, from where the claims that lemons alkalize the body originate?
- Lemons contain citrate:
Citrus fruits...contain natural citrate and the highest citrate level exists in lemon.
- Citrate supplements can be used to alkalinize urine
Citrates are used for alkalinization of urine (as alternatives to sodium bicarbonate) in conditions where long-term maintenance of an alkaline urine is desirable (e.g., management of uric acid and cystine calculi of the urinary tract).
- However, this effect doesn't happen from drinking lemonade:
It has been known that citraturic effect of potassium citrate was due to net alkaline load produced by its oxidation to bicarbonate and its renal excretion. In spite of this, lemonade treatment has not caused urinary alkaline load due to low pH of lemon juice.
- Lemons do not alkalize the body.
- Citrate from supplements alkalizes the urine.
- Citrate from lemons does not alkalize the urine.