You must be familiar with the term "Freshman 15" referring to the 15 pounds every newbie at college gains during the first year...well, that term is alive and well at Atlas Air due to the catering that is available on most freighter flights.
We lovingly call it "Body by Atlas"...and every FNG feels the pressure to uphold that tradition!!
Yes, the catering is usually very good...but also mostly that there is little to do on long haul flights but solve the world's problems, complain about Atlas, complain about Atlas management (!!), and eat, eat, and eat some more...
Good luck.