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  • Title: Glycogen storage disease type 1: impact of medium-chain triglycerides on metabolic control and growth.
    Author: Das AM, Lücke T, Meyer U, Hartmann H, Illsinger S.
    Journal: Ann Nutr Metab; 2010; 56(3):225-32. PubMed ID: 20357432.
    Abstract:
    BACKGROUND/OBJECTIVE: Hypoketotic hypoglycaemia and hypertriglyceridaemia are biochemical hallmarks of glycogen storage disease (GSD) 1. Increased malonyl coenzyme A production which compromises oxidation of long-chain fatty acids via carnitine palmitoyltransferase (CPT) 1 inhibition plays a crucial role in the pathogenesis of these complications. Therapy consists primarily of nutritional support including frequent carbohydrate-rich meals. We studied the effect of a diet enriched in medium-chain triglycerides (MCT) on metabolic control/growth in GSD 1 as medium-chain fatty acids can be oxidised independently of CPT 1. METHODS: An adult female, a 1.6-year-old boy with GSD 1a and a 6.5-year-old girl with GSD 1b treated with a classical GSD diet were enrolled; their 'classical GSD diet' was supplemented with MCT fats. Concentrations of glucose, lactate, ketone bodies triglycerides, uric acid, acylcarnitines in blood and organic acids in urine were determined. RESULTS: No clinical or biochemical side-effects were observed. The MCT diet led to a decrease in uric acid concentrations in all patients. Triglyceride levels were reduced only in the youngest patient, while lactate concentrations did not significantly decrease. The MCT diet allowed for a reduction in carbohydrate and caloric intake required to maintain euglycaemia and led to improvement in growth in the two prepubertal patients. CONCLUSIONS: MCT supplementation had a positive effect on metabolic control and growth in our patients suffering from GSD 1.
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