Gabor Erdosi and Ivor Cummings chat about the role of the intestinal hormones GIP and GLP-1 on blood sugar and insulin levels.
Whole food is best and processed food is bad, with processed sugars and carbs being especially dangerous.
References:
High Glycemic Index Metabolic Damage – a Pivotal Role of GIP and GLP-1
Authors: Andreas Pfeiffer, Farnaz Keyhani-Nejad
https://www.sciencedirect.com/science/article/pii/S1043276018300468