Does Resistant Starch Formed by Cooling Pasta Decrease the Postprandial Glycemic Response in Type 1 Diabetes? A...

Area of Science:

• Nutrition Science
• Endocrinology
• Metabolic Health

Background:

• Culinary processing significantly impacts postprandial glycemia in type 1 diabetes (T1D).
• Cooling cooked starch increases resistant starch (RS) via retrogradation, potentially reducing glucose excursions.
• Resistant starch may offer a dietary strategy for managing blood glucose levels.

Purpose of the Study:

• To evaluate if cooling and reheating pasta improves postprandial glycemia in adults with T1D.
• To determine if this preparation method increases hypoglycemia risk with standard insulin pump bolus calculator use.
• To assess the impact of pasta preparation on glycemic control in T1D management.

Main Methods:

• A randomized, single-blind, crossover study involving 32 adults with T1D on continuous subcutaneous insulin infusion (CSII).
• Participants consumed standardized pasta meals: freshly cooked versus cooled (24h at 4°C) and reheated.
• Interstitial glucose levels were monitored for 180 minutes post-meal, with insulin boluses calculated by pump bolus calculators.

Main Results:

• Cooled/reheated pasta significantly reduced maximum glycemia, glycemic rise, and incremental area under the curve (iAUC) compared to freshly cooked pasta.
• Resistant starch content was higher in cooled/reheated pasta (12.88 g/100 g) versus freshly cooked (8.03 g/100 g).
• No significant difference in the incidence of hypoglycemic episodes was observed between the two pasta preparations.

Conclusions:

• Cooling and reheating pasta increases resistant starch content.
• This preparation method effectively attenuates postprandial glycemia in adults with T1D.
• The strategy appears safe, not increasing early postprandial hypoglycemia risk under typical insulin pump use.