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RE: The History Of Vaccine Series
Fortunately, these sort of nutritional deficiencies are not seen in most countries nowadays, but once the world had to struggle with a high prevalence of vitamin deficiencies. Scurvy was one of the more common ones due to Vit C being essential for humans and famines being so common. However, some other deficiencies, especially those of Vit B (B1 and B12 especially) are still seen, even in developed countries.
Great post!
The B vitamins come from animal products and very difficult to obtain if you don't have the land for chickens for their eggs and goats for their milk or the cash to buy B rich food. Most poor people in the past had enough land to grow their own food. Now all the land is being taken over by factory farms or turned into parkland.