Grizzly bears can eat up to 58,000 calories per day and even more as they prepare to hibernate.
And before they head off for their long sleep they eat large quantities of berries and salmon, sending their blood-pressure through the roof.
Yet Grizzlies don’t suffer from heart attacks or other issues from their eating habits and large fat storage.
Now doctors in Washington State University are studying the creatures to see if they can give humans some help.
"When I thought about obesity, I thought about Yogi Bear," Kevin Corbit told The Wall Street Journal.
But Corbit said bears do bring with them a problem.
They might just rip your face off if you aren’t careful.
So Corbit distracts his patients with honey while doing his work.
One early finding is that bears can adjust how they respond to insulin.
That’s the hormone that helps with the breakdown of fat and sugar in the food we eat.