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A classic example concerns the "epidemic" of pellagra, considered an infection early in the century, and which accounted annually for 250,000 cases and 7000 deaths in 15 Southern cotton-growing US ...

Collagen is a protein found in connective tissues in your body. It is located in your skin, bones, tendons, and ligaments. Its main job is to give tissues structure and help them withstand stretching ...

It manifested first as scaly skin patches, hence the name it was given in an Italian dialect: pellagra, meaning ‘rough skin’. Then gums would bleed, teeth fall out, diarrhoea set in, and, most scarily ...