The man in his early forties felt perfectly well. A desk-based office worker, he had come in for a routine health assessment. The finding of prediabetes surprised him, despite a strong family history of diabetes and cardiovascular disease, recalls Hong Kong family medicine specialist Dr Geoffrey Lau Yue-young. They agreed on three goals: replace sugary drinks with unsweetened alternatives, walk for 20 to 30 minutes most days, and reduce the portion of rice or noodles at dinner. But business...