Do you know what weight gain can do for you besides emerges disease?
Weight gain on your face is the result of water retension rather than body fat. Consuming too mush of refined sugar and salt can cause water retension, hence making your face look fatter.
The easiest way to prove this is if you were used to have french fries, fast food, high sugar chocolate bars late night right before bad time. You will notice that your face, when you wake up the next morning is puffier than usual and you will feel bloated.
So if you want to get slimmer and sharper face, try to reduce your salt and sugar intake, drink plenty of water, watch your weight, avoid alcohol, and the last is perform facial exercises. For complete tips, please check this video. Cheers!