Homeostasis is the maintaining of a stable and healthy environment in any organism. Any disease is fundamentally a disruption of this stability, causing some kind of disorder in the organism's inner functions.
C.your perception of stress
Most likely they will gain weight fairly quick, it depends on how many calories they burn in a day though.
A. more successful
Hope this helps.
Heres 4, pick your favorites haha
.Trying to Keep Up with Others
.Forgetting About the Unexpected
.Using Outdated Software
.Forgetting About the Small Items