Tutoring biology, as well as hearing new ideas about nutrition, might lead to the topic of blood pH.
On the pH scale, 7 is neutral, below 7, acid, and above 7, alkaline (or base).
Human blood pH range, for health, is between 7.35 and 7.45. For survival, it’s between 6.8 and 7.8, according to conventional wisdom.
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.