How reducing carbohydrates help in diabetes Carbohydrates are the primary macronutrient that significantly impact blood sugar levels. When you consume carbohydrates, they are broken down into glucose, which enters the bloodstream, causing blood sugar levels to rise. For individuals with diabetes, especially type 2 diabetes, the body struggles to regulate blood sugar effectively. By reducing carbohydrate intake, you can minimize the influx of glucose into the bloodstream, helping to stabilize blo