A 43-year-old man is referred to you for an incidental finding of elevated hemoglobin. Laboratory results are as follows:
Hemoglobin
185 g/L (130-170)
Mean corpuscular volume
92 fL (60-100)
White blood cells
7.8×1037.8×103 / L (4-10)
Platelets
250×103250×103 / L (130-400)
His BMI is 23. He has type 2 diabetes for which he takes gliclazide MR 60 mg daily. Which one of the following features on history could explain his laboratory abnormality?
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