Meal Composition May Matter More Than Insulin Type for Blood Sugar Control

Researchers wanted to understand how different factors affect blood sugar control in people with Type 1 diabetes using the MiniMed 780G advanced hybrid closed-loop system. They studied 12 adults over 11 weeks, testing two types of rapid-acting insulin: faster-acting insulin aspart (FiAsp) and standard insulin aspart.

Each participant ate 12 standardized meals containing 60 grams of carbohydrate but with different fat and protein combinations. Meals were eaten at different times of day, and participants sometimes received their full insulin dose and sometimes just half. The main goal was to see which insulin kept blood sugar in the target range (3.9-10.0 mmol/L) for the longest time after eating.

When researchers combined all meal types, times, and insulin doses, faster-acting insulin aspart showed a slight advantage over standard insulin aspart for keeping blood sugar in range after meals. However, this difference was modest and not quite statistically significant. The advantage was most noticeable after morning meals.

Neither insulin type performed notably better when participants received a reduced insulin dose (50% of the normal amount) or when eating different types of meals.

The research revealed that meal composition had a more substantial impact on blood sugar control than which insulin was used. High-fat, low-protein meals kept blood sugar most stable, with an average of 83.7% of the time in range. High-fat, high-protein meals performed less well at 74.7%, and low-fat, low-protein meals had the most difficulty, with just 62% of time in range.

This suggests that including fat and protein in your meals—even at the same carbohydrate level—may help moderate blood sugar swings more effectively than insulin choice alone.

The study found that morning meals presented more challenges for blood sugar management than evening meals, regardless of which insulin type was used. This aligns with what many people with Type 1 diabetes experience in daily life—morning insulin sensitivity and metabolism can be different from the rest of the day.

These findings come from a small study in adults using a closed-loop system, so results may not apply to everyone or all insulin delivery methods. If you're curious about how meal composition or timing affects your own blood sugar patterns, discussing your observations with your healthcare team can help guide personalized management strategies.

Source: Diabetes technology & therapeutics. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.