For adults with type 1 diabetes, changing the glycemic index of foods does not meaningfully alter blood glucose patterns over four weeks, whether they eat a lower or higher amount of carbohydrates.
Mechanism
Synthesis from 1 study
Whether you eat fast or slow carbs doesn’t change your blood sugar much if the total amount of carbs stays the same. More carbs mean more insulin is needed; fewer carbs mean more fat gets released, which makes insulin work less well. These two effects cancel each other out, so blood sugar stays...
Most probable mechanism
When someone eats a lot of carbs, their body needs more insulin to handle the sugar, no matter if the carbs are fast or slow to digest. If they eat fewer carbs, their body needs less insulin, and fat breaks down more, which makes it harder for muscles to take up sugar. These two effects — how much insulin is needed and how well muscles respond to it — balance out so that blood sugar doesn’t change much based on whether the carbs are high or low glycemic, as long as the total carb amount stays the same.
Total dietary carbohydrate intake determines the magnitude of postprandial glucose elevation and the corresponding insulin requirement.
High-glycemic index carbohydrates accelerate glucose absorption, increasing insulin demand, but this is counterbalanced by higher total carbohydrate intake reducing the relative impact of glycemic differences.
Low-carbohydrate intake reduces insulin availability, leading to increased lipolysis and elevated free fatty acids in circulation.
Elevated free fatty acids impair insulin signaling in muscle and liver tissue, reducing glucose uptake and increasing hepatic glucose output.
The combined effect of increased insulin demand from high-carbohydrate diets and reduced insulin sensitivity from low-carbohydrate diets results in comparable net glucose exposure, variability, and time in range regardless of glycemic index.
Evidence from Studies
Supporting (1)
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Effects of Dietary Carbohydrate Concentration and Glycemic Index on Blood Glucose Variability and Free Fatty Acids in Individuals with Type 1 Diabetes
Contradicting (0)
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