Why do I always fart at night in office?

by the way I dont fart in the morning but in evening when Im duty I can't control my fart that it will just release on its own. Like Im scared someone might hear it or it might have a had smell or something by the way Im Asian and I bring my dinner my dinner is always rice with meal like fried spring rolls or rice with fried chicken and its always happen so when I feel Im about to fart I will run to bathroom to just fart
Why do I always fart at night in office?
Post Opinion