The Effects of Nextida-GC and Whey Protein on Postprandial Glycemic and Insulinemic Responses When Given 30min Before, 10min Before or With a Standardized Breakfast Test-meal in Healthy Adults With and Without Prediabetes

The goals of this clinical trial are to learn if Nextida-GC (a peptide derived from collagen) will reduce postprandial glucose responses when taken 30 minutes before, 10 minutes before or with the first bite of a breakfast test-meal consisting or bread, margarine and jam with a drink coffee, tea or water (each subject will choose a drink and have the same drink each time). The main questions it aims to answer are: Does Nextida-GC reduce glucose responses more than whey protein? What are the effects of Nextida-GC and whey protein on plasma glucose and serum insulin responses when given 30 minutes before eating, 10 minutes before eating, or with the breakfast test meal? Overall, is it better to take Nextida-GC 30 minutes before eating, 10 minutes before eating, or with the breakfast test meal? Participants will: Come to the research center (INQUIS Clinical Research, Toronto, Ontario, Canada) on 8 separate occasions (with bewteen 3 and 14 days between visits) after an overnight fast of at least 10 hours. Each participant will undergo all 8 treatments (one treatment per visit): Block 1 * 10 grams Nextida-GC in water 30 minutes before eating the test-meal * 10 grams Nextida-GC in water 10 minutes before eating the test-meal * water 30min before eating and 10g Nextida-GC in water with the test-meal * water 30min before eating, and water with the test-meal Block 2 * 10 grams whey protein in water 30 minutes before eating the test-meal * 10 grams whey protein in water 10 minutes before eating the test-meal * water 30min before eating and 10g whey protein in water with the test-meal * water 30min before eating, and water with the test-meal The order of the blocks will be randomized and the order of the treatments within the blocks will be randomized. On each occasions finger-stick blood samples for measuring glucose and insulin will be obtained 30, 10 and 0 minutes before starting to eat the test-meal and 15, 30, 45, 60, 90, 120 and 180 minutes after the first bi