Viscoelastic or Viscoplastic Glucose Theory (VGT #49): Investigating the Contribution Margin of Carbs/Sugar Intake Amount and Post-Meal Walking K-Steps on PPG Formation Using 4 Validations: VGT (Viscoelasticity/Plasticity Theory), LEGT (Linear Elastic Glucose Theory), EFT (Energy Theory via Fourier Transform), Along with 8 Sub-Cellular Pathology Pathways with Sensor PPG, Carbs, and K-Steps Data from an ~4-Year Period from 5/8/18 to 3/25/2022 Based on the GH-Method: Math-Physical Medicine (No. 634)