Influence of dietary fat on postprandial glucose metabolism (exogenous and endogenous) using intrinsically 13C-enriched durum wheat | British Journal of Nutrition | Cambridge Core
Influence of dietary fat on postprandial glucose metabolism (exogenous and endogenous) using intrinsically 13C-enriched durum wheat - Volume 86 Issue 1
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So it looks that the maximun amount of fat that someone can add to a high glycemic meal is 15 grams otherwise it creates insulin resistance.