If humans had the metabolism of a hummingbird, they would have to eat about 155,000 calories a day.
Picture from Hummingbirds.net
They may be the tiniest birds on the planet, but hummingbirds are the biggest eaters. In fact, no animal has a faster metabolism—roughly 100 times that of an elephant. Hummingbirds burn food so fast they often eat 1-1/2 to 3 times their weight in nectar and insects per day.