Supposedly so
In India there are those who supposedly liv eon breath
(There is not much food in some communities;})
The thinking is that plant life has the synethesis of light through photosynthesis in plant life, when the body vibrates at a certain level the light is ingestible without the middle plant man

I think breathe is necessary for every thing, but I suppose if one wannted to live on sushine the vibratory level would respond positively to breathe

Although one has to breath no matter vege, ominivore, or sunlight eater

Do you think that vi-brators are sneaking food?

In the autobiograph of a yogi, parmahansa yoganandas biograph, he knew of one suchh woman and her excerpt is in that book, also Masters of the far east is another 4 or 5 part series of a trip to meet the Himalayan saints all sorts of Jesus liek miracles were performed for food and weather

The bible does say we have domain, I think this is quite literally meant

There is no such thing as a true breatharian - it is a myth. You have a digestion system for a reason. It is not there for show. Fasting has its place, but to permanently give up food and water means death. People who claim they are breatharians are sneaking it on the sly.

Maybe I should rephrase the questions:

1)Can breatharians purportedly sustain the same amount of physical activity as non-breatharians?
2)I am confused on whether breatharians purportedly require sunlight. And how about air?