Do you all think it would be exhausting to be 600 pounds in weight?

Hi All. I am watching 600 pound life and I am thinking How just How can anyone eat enough to keep that way? I nibble all day long and get a little fat if I don't work it off I am 10 pounds too fat, but 600? Who is making food or feeding these people? I wouldn't keep feeding a bedridden or housebound person under my supervision, it would be cruel to let someone get that way. . Gosh just can't understand it. Anyone know of people that big and if so who feeds them?