15 year old boy survives purely on prana, no food or water for 10 months

[Unbound]

Ah, this is the "Buddha boy" although he insists he is only at the level of a Rinpoche, or at least last time he was asked. Breatharian techniques maximizes the gains from breathing, so I would not say he was completely without food or water, just obtaining the necessities through other means. That being said, if you don't know what you're doing I wouldn't suggest trying this aha