Uncontrolled diabetes can blind a person overnight: Dr V Mohan

On the Figuring Out podcast, Dr V Mohan, a diabetology expert, said diabetic retinopathy can cause sudden blindness. High sugar damages retinal vessels, which leak and sprout fragile new ones. "They'll easily burst, flooding the retina with blood so overnight you can go blind," he said. Cataracts also strike diabetics earlier.