Was the first vitamin to be discovered scientifically.

The answer is Thiamine or vitamin b1, it discovered in 1910 .

Thiamine help body to convert ccarbohydrates into energy, which commonly found in rice.

It also helps to metabolize protein. 3 years later, in 1913 vitamin a was found.

What's the question again?

Think it's rice because in many countries rice is the main food so it can be traditionally served all at once.