KARACHI, Pakistan — There's no shortage of sunlight in this city. Overcast days are rare, and the mid-afternoon sun is so searingly bright, I actually have to wince my eyes shut and wait for the sunspots to clear before I can see again.
So imagine my surprise when a recent blood test showed that my vitamin D levels are so low my doctor called for injections.
"Vitamin D shortages can cause muscle failure, bone decay and serious osteoporosis," she told me firmly.
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