In contrast, our most common ways of generating energy today are woefully inefficient, as summarized in table 6.1 and figure 6.3. Digesting a candy bar is merely 0.00000001% efficient, in the sense that it releases a mere ten-trillionth of the energy mc2 that it contains. If your stomach were even 0.001% efficient, then you’d only need to eat a single meal for the rest of your life.
