Glycemic Index Evaluation of Flaxseed Oats Sourdough Bread

Background: Glycemic index (GI) is a numerical system that ranks carbohydrate-containing foods by how much they raise blood glucose level. Understanding GI is beneficial in diet management, especially for weight loss or diabetic people. Various types of food, such as functional foods, have recently gained attention for their health benefits, with sourdough bread being a notable example. As sourdough bread becomes a preferred option for weight and diabetes management, disclosing its glycemic index is crucial. Objective: This study aims to assess the glycemic index of a newly available bread, the flaxseed oats sourdough bread. Methodology: Ten healthy subjects aged between 23 to 37 years old were recruited (mean 28.7 ± 4.4 years) and required to fast and then consume 50 g of available carbohydrate portions of test and reference foods. Finger capillary blood samples were collected at the start (fasting, 0 minute) and 15, 30, 45, 60, 90 and 120 minutes after consumption. The GI was calculated from the ratio of incremental area under the curve (iAUC) to reference food. Result: The results show that flaxseed oats sourdough bread has a GI of 37.3 which is classified as low GI. Conclusion: Determining the GI value of this bread provides valuable data that can enhance dietary recommendations for weight and diabetes management. Implementing a low GI diet nationwide necessitates ongoing research, public education, and collaboration with food manufacturers to ensure consumers have access to healthier carbohydrate options.