Allulose and Glucose Metabolism: Context from a Published Case Series

In a case report published by Designs for Health, generally healthy adults consumed allulose gummies with meals while researchers tracked their glucose throughout the day. The report offers a real-world look at allulose alongside carbohydrate-containing meals.*

Allulose, also called D-psicose, is a rare sugar found naturally in small amounts in foods such as figs, raisins, jackfruit, and maple syrup. The body processes allulose differently from regular sugar. Most absorbed allulose leaves the body through the urine rather than being used for energy. As a result, allulose provides about 70% of the sweetness of table sugar but contributes very few calories.

Researchers have studied allulose as an alternative to regular sugar and for its potential role in supporting healthy glucose metabolism in people whose blood sugar is already within the normal range.* When consumed with carbohydrates, small amounts of allulose may help support a healthy post-meal glucose response.* Researchers are studying several ways allulose may have this effect. It may influence how carbohydrates are broken down, how glucose is absorbed in the intestine, and how the liver processes and stores glucose.*

In the published case series, researchers used CGM data to examine post-meal glucose, average glucose over 24 hours, and glycemic variability on days participants consumed the allulose-containing gummies and days they did not.

The gummy formula also included soluble tapioca fiber, which the report described as a prebiotic resistant starch. Prebiotics help nourish beneficial bacteria in the gut.* Resistant starch is a type of carbohydrate that passes through the small intestine without being fully digested and can help support a healthy gut environment.* Researchers have also studied prebiotic fiber and blood sugar response, including the potential role of resistant starch in supporting healthy post-meal glucose and insulin responses.*

The formula also contained heat-treated Lactobacillus casei, which the report described as a postbiotic. Unlike probiotics, postbiotics do not contain live microorganisms but may provide compounds that help support gut health.*

These ingredients broadened the formula beyond allulose alone. While allulose was included for its potential role in supporting a healthy post-meal glucose response, the resistant starch has been studied for its potential role in supporting the gut and healthy glucose metabolism.* Because the gummy contained multiple ingredients, however, the case series cannot determine how much each ingredient contributed to the findings.

The case report followed 15 generally healthy adults without diagnosed diabetes during a six-day self-monitoring period. Participants continued their usual diets and daily routines rather than eating standardized meals. They wore CGMs that measured glucose every five minutes and logged meals, supplement intake, sleep, movement, hydration, and symptoms. Researchers used this information to examine post-meal glucose, average glucose over 24 hours, and changes in glucose throughout the day.

The primary analysis included eight participants with complete six-day CGM data and sufficient adherence to the study protocol.

The case series had several important limitations. Participants did not follow standardized diets or formally record what their meals contained, so meals and carbohydrate intake could differ between comparison days. The primary analysis included only eight participants, and the study had no blinding or placebo control. The gummies also contained ingredients besides allulose, so researchers could not determine the contribution of allulose alone.

This report describes the experiences of a small group of people who used an allulose-containing gummy with meals. It cannot show cause and effect, tell us whether other people would have the same experience, or determine the effects of any individual ingredient. It should not be used as a supplementation plan.