A Simpler Way to Bolus: New Research Shows Basic Meal Categories Work as Well as Detailed Carb Counting

Carbohydrate counting—weighing or estimating the grams of carbs in every meal—is one of the most challenging parts of managing Type 1 diabetes. For many people, the effort and mental load can get in the way of using newer tools like automated insulin delivery (AID) systems, which work best when they receive accurate meal information.

This new research asks an important question: do people on AID systems really need to count carbs so precisely? Or can a simpler approach work just as well?

Researchers enrolled 31 adolescents and young adults (average age 17.4 years) who were already using automated insulin delivery systems. All participants tried two different ways of telling their pump about meals, switching between them every 4 weeks.

The simple method used three categories: small meals (30 grams of carbs), medium meals (60 grams), and large meals (90 grams). Participants were trained to pick the category that best matched their meal size, rather than counting exact carbs.

The traditional method was standard carbohydrate counting, where participants estimated or measured the exact grams of carbs they ate.

The simple meal categories worked nearly as well as precise carb counting. Time in range—the amount of time blood sugar stayed in the target zone of 70–180 mg/dL—was 64.2% with simple boluses compared to 66.0% with carb counting. This small difference (1.8%) met the study's goal for 'non-inferiority,' meaning the simpler method did not perform meaningfully worse.

Other measures of blood sugar control, like time spent high (above 250 mg/dL) and time spent low (below 70 mg/dL), were also similar between the two approaches.

When asked which method they preferred after the study, 40.6% of participants chose the simple bolus strategy, while 31.3% preferred traditional carb counting, and 28.1% wanted to stick with their original method.

For young people using automated insulin delivery, this research suggests that precise carbohydrate counting may not be required to achieve good blood sugar control. The AID system's ability to adjust insulin delivery appears to be flexible enough to work well with simpler meal information.

This finding could remove a major barrier for some people who find carb counting overwhelming or frustrating. However, this study included a specific group (ages 14–26) using AID systems, so these results may not apply to everyone with Type 1 diabetes, particularly those using other insulin delivery methods.

As always, the best approach to meal bolusing is something you should discuss with your diabetes care team. What works well for one person may not be ideal for another.

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.