A 17-year-old man seen for thirst and unexpected weight loss was found in laboratory examinations on admission to have plasma glucose (PG) markedly elevated to 1,107 mg/d
l and hemoglobin A
1C of 13.5%, although his consciousness was alert. Serum keton body was elevated to 8,460 μg/
l, while arterial pH remained within normal range i.e., 7.36. He was diagnosed with soft-drink ketosis because of a negative serum anti-GAD antibody, a habit of over drinking soft drinks and obesity (BMI 29.9). He was treated with fluids and insulin and hyperglycemia improved shortly. Serum fructose concentration extremely elevated to 517.3 μmol/
l (standard range:<10 μmol/
l, 1 μmol/
l=0.018 mg/d
l) on admission decreased to 67.9 μmol/
l (PG 330 mg/d
l) 1 day and to 18.9 μmol/
l (PG 218 mg/d
l) 11 days after admission. The mean serum fructose concentration of patients with soft-drink ketosis (n=3) is obviously higher than that of patients with diabetic ketoacidosis (n=10) at admission, although mean PG was similar. Markedly elevated serum fructose concentrations may thus play an important role in the pathogenesis of soft-drink ketosis.
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