Suni Williams who is still in orbit, has lost a lot of weight.

I wonder if it's related to that. Trying to find a commonality.

This quote was interesting, not sure exactly how true it is -

"Due to changes in metabolism, astronauts consume twice as many calories as an ordinary person: just to maintain their current weight, it takes about 4 thousand calories per day. Williams, doctors suggest, will need about 5 thousand calories."