This document promotes a book called "Smart Blood Sugar" that provides a "Diabetes Reversal Recipe" developed by Dr. Marlene Merritt. The recipe claims to enable diabetics to lower their blood sugar without restrictive diets by flipping their cells' blood sugar "switch" back on. The summary describes how a 59-year old man named John lowered his fasting blood sugar by 120 points in 2 days by following the recipe and was able to stop taking insulin. The document asserts that the recipe works through calibrating nutrients to reverse insulin resistance and allow cells to efficiently burn sugar again.