Viscoelastic or Viscoplastic Glucose Theory (VGT #78): A Sensitivity Analysis of the Baseline Selection for Normalized Fasting Plasma Glucose to Study Two Symptoms of Postprandial Plasma Glucose and Glucose Fluctuation versus 3 Causes of FPG, Carbohydrates/Sugar Grams, and Post-Meal Walking Steps Based on GH-Method: Math-Physical Medicine and the Utilization of the VGT Energy Tool (No. 668)