Doctors are trying to puzzle out the spike in the disease which genetic predisposition, diet and exercise can’t fully explain, writes Thomas Fuller:

HE survived the deprivation of the Vietnamese countryside and decades of war, but Pham Van Dang, 70, lay dazed in his hospital bed, the stump of his newly amputated leg sewn up like the seams of a leather bag.
Dang and many younger patients in the diabetes ward at Nguyen Tri Phuong Hospital are casualties of rising affluence, his doctor said. “I see more and more patients with diabetes,” said Dr Tran Quang Khanh, who is chief of the endocrinology department, whose ward receives 20 new patients a day.
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