LOS ANGELES — He knows he sounds like a snake-oil salesman.
It’s not every day, after all, that a tenured professor at a prestigious university starts peddling a mail-order diet to melt away belly fat, rejuvenate worn-out cells, prevent diseases ranging from diabetes to cancer — and, for good measure, turn back the clock on aging.
But biochemist Valter Longo is convinced that science is on his side.
