Understanding the percentages of HbA1c for diabetes and DV for nutrition

Measuring HbA1C gives an overall picture of what a person’s average blood sugar levels have been over a period of three months. — 123rf.com

In response to my recent column about diabetes, reader F.D. sends this question: “Question on (A1C) test: Please explain how does this test know to take an average of three months, and not two months or one week?

“I take my blood level check everyday and that gives an answer at that precise moment of time, which I understand.