Can a person be fed fat through an IV or would astronauts need to put on massive weight before long missions?
That would be an awkward detail left out of sci-fi.
Bears put on massive weight, and might gain up 4 kg per day according to this [0] article. And up to 30% of their body weight is lost during hibernation according to this [1] one.
Forget space travel, I expect a Tessier-Ashpool type situation where billionaires and members of Congress and whatnot are only briefly woken up every few decades to make a few decisions and so retain their grip on power by never dying.
