Would you believe someone could live on a liquid diet devoid of water and purely comprised of Coca-Cola for half a century? Meet Roberto Pedreira, a 70-year-old gentleman with a carbonation fixation that would make fizzy drink aficionados foam at the mouth. This man claims that for the last 50 years, not a single drop of water has passed his lips, just an unwatered-down devotion to the classic cola.

Doctors are scratching their heads, and probably checking his blood work for traces of the Real Thing, as Pedreira’s bizarre beverage choice isn’t exactly in line with the nutritional pyramid. And when it’s time to take his medicine, forget about a sip of H2O—this guy wants his pills with a side of pop. Despite the potential health pitfalls of such a diet, it seems that Pedreira has somehow defied conventional wisdom and hydration norms to keep on ticking with a Coke in hand.

As we ponder the implications of such an unconventional diet, it’s tough not to wonder about Pedreira’s grocery bills. It’s not clear whether he’s loyal to one particular brand of cola, but one thing’s for sure: his willpower to resist the lure of a crisp, refreshing glass of water is nothing short of astounding—or questionably sane.