Among the yogis of India throughout the centuries there have been those adept in obtaining all their energy requirements from the Sun, while refraining from eating food. In his best-selling book Autobiography of a Yogi, Paramahansa Yogananda wrote of one such lady called Giri Bala and says to her, “Your nourishment is derived from the finer energies of the air and sunlight, and from the cosmic power that recharges your body through the medulla oblongata.” [Those ‘finer energies’ are the same that I refer to in my articles as Pneuma].

He predicts that, “Someday scientists will discover how man can live directly on solar energy,” comparing it to the way chlorophyll collects and stores the Sun’s energy in plants. He cites a speech made by Dr Geo. W Crile in the USA back in 1933 as follows: “This all important radiation, which releases electrical currents for the body’s electrical circuit, the nervous system, is given food by the Sun’s rays. Atoms, Dr Crile says, are solar systems. Atoms are the vehicles that are filled with solar radiance as so many coiled springs. These countless atomfuls of energy are taken in as food. Once in the human body, these tense vehicles, the atoms, are discharged in the body’s protoplasm, the radiance furnishing new chemical energy, new electrical currents. ‘Your body is made up of such atoms,’ Dr Crile said. ‘They are your muscles, brains, and sensory organs, such as the eyes and ears’.”[1]

Just as with looking at the Sun, I add the caveat that nobody should attempt these kinds of practices without the training and supervision of qualified teachers!
 
 
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REFERENCE:
[1] Autobiography of a Yogi, Paramahansa Yogananda, Self Realization Fellowship, USA, 1946, p.396