Sustained high plasma mannose less sensitive to fluctuating blood glucose in glycogen storage disease type Ia children

Plasma mannose is suggested to be largely generated from liver glycogen-oriented glucose-6-phosphate. This study examined plasma mannose in glycogen storage disease type Ia (GSD Ia) lacking conversion of glucose-6-phosphate to glucose in the liver. We initially examined fasting—and postprandial 2 h—plasma mannose and other blood carbohydrates and lipids for seven GSD Ia children receiving dietary interventions using cornstarch and six healthy age-matched children. Next, one-day successive intra-individual parameter changes were examined for six affected and two control children. Although there were no significant differences in fasting—and postprandial 2 h—glucose and insulin levels, the mannose level of the affected group was invariably much higher than that of the control group ( p