Figure 1 Mean serum levels at timed intervals. (A) Mean serum sulphate levels relative to baseline of all 14 patients during the 3‐h fasting period (o) and during the 3 h after ingestion of 75 g of glucose (•). (B) Mean glucose levels of patients relative to baseline during the 3 h after ingestion of 75 g of glucose: (•) all 14 patients, (o) excluding the three patients with diabetes or glucose intolerance.