Shift-work or chronic jet-lag have profound consequences on circadian and metabolic events in the body. Animals that are forced to eat during their resting period show increased <answer>body mass</answer> and altered expression of clock and metabolic genes.[medical citation needed] In humans, shift-work that favors irregular eating times is associated with altered insulin sensitivity and higher <answer>body mass</answer>. Shift-work also leads to increased metabolic risks for cardio-metabolic syndrome, hypertension, inflammation.
Animals that eat during resting periods show what body increase?
body mass