1927 study: Carbohydrate consumption improves glucose tolerance while fat and fasting induce insulin resistance
Summary
A 1927 preliminary study by Dr. J. Shirley Sweeney investigating how different dietary macronutrient compositions affect glucose tolerance test results in healthy young subjects. The study found that a high-carbohydrate diet sensitizes the body to future carbohydrate loads (improving glucose tolerance), while high-fat diets and starvation create an insulin resistance-like effect where blood sugar remains elevated after a glucose challenge. This early research provided foundational evidence for the concept of metabolic adaptation to diet composition.
Source
Twitter / X1927 study: Carbohydrate consumption improves glucose tolerance while fat and fasting induce insulin resistancemeatrition.comKey quotes
· 3 pulledThe first dose of glucose sensitizes the insulin-secreting mechanism, so that in response to the second dose the islet cells secrete insulin more readily and more abundantly at a lower level of hyperglycaemia.
Sweeney, in 1927, attempted to explain the variations in sugar tolerance found in normal subjects on different diets.
Carbohydrates sensitize the body to future carbohydrates, while fat and starving create an insulin resistance effect where blood sugar stays high after a sudden assault of glucose.
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