Low-Protein Flour vs. High-Protein Flour: How Should Diabetics Choose?

When choosing between high-protein and low-protein flour, diabetic patients should prioritize total carbohydrate intake and glycemic index (GI) rather than protein content.The difference in protein content between high-protein and low-protein flour (high-protein: about 12–14%; low-protein: about 8–10%) has little direct effect on blood glucose. Processing methods, dietary fiber content, and portion size are far more important.It is recommended to choose fiber-rich alternatives such as whole wheat flour and mixed grain flour, and control total intake.
I. Differences and Similarities Between High-Protein and Low-Protein Flour

1. Similar core ingredients
   Both are mainly composed of carbohydrates (about 70–75%). The difference in protein content does not affect total carbohydrates.Whether it is high-protein flour (e.g., bread flour) or low-protein flour (e.g., cake flour), both are converted into glucose in the body and ultimately affect blood glucose levels.
2. Processing method and glycemic index
   Refined flour (whether high- or low-protein) has low dietary fiber and a high GI (about 85) because bran and germ are removed, which may cause a rapid rise in blood glucose.In comparison, whole wheat flour has a lower GI (about 50–60) and is more suitable for diabetics.
   II. Precautions
3. Prioritize whole-grain or mixed-grain flour
   Whole wheat flour, buckwheat flour, oat flour, etc., are rich in dietary fiber and minerals, which can slow sugar absorption.For example, whole wheat bread has a GI value about 30% lower than white bread, making it more beneficial for stable blood glucose.
4. Control single serving size
   Even low-GI flour requires portion control.It is recommended that staple food per meal should not exceed 50–75 grams (raw weight), paired with protein (e.g., eggs, beans) and vegetables to reduce the overall glycemic load.
5. Avoid refined flour products
   Highly processed foods such as cakes, biscuits, and white bread usually use refined high- or low-protein flour and may contain added sugar, so they should be avoided as much as possible.