[metmom]

This story is wrong somehow. It has to be fake. Fryer grease potatoes and bread would not make someone go blind. Obviously a kid who could maintain this diet for so long has to have other issues as well. But lack of vitamins would not cause blindness in a teenager.

Vitamin A deficiency can.

What Is Vitamin A Deficiency?

https://www.aao.org/eye-health/diseases/vitamin-deficiency

Vitamin A plays an important role in your vision. To see the full spectrum of light, your eye needs to produce certain pigments for your retina to work properly. Vitamin A deficiency stops the production of these pigments, leading to night blindness. Your eye also needs vitamin A to nourish other parts of your eye, including the cornea. Without enough vitamin A, your eyes cannot produce enough moisture to keep them properly lubricated.

Vitamin A deficiency is the leading cause of preventable blindness in children worldwide. An estimated 250,000 to 500,000 children become blind every year because of vitamin A deficiency. Half of these children die within a year of losing their sight.

In pregnant women, vitamin A deficiency causes night blindness and may contribute to maternal mortality. Vitamin A deficiency also harms the immune system (the body’s ability to fight disease). This increases the chance of death from malaria, measles and diarrhea.

[RouxStir]

Re: Vitamin A.

On the other end of the consumption spectrum:

I remember reading about an Arctic expedition that ran out of food...killed a polar bear for food. Turned out okay for those who ate the muscle meat...not so good for the ones who shared the liver. They died. There is so much vitamin A built up in livers of animals that consume certain fish that their liver is highly toxic to humans.