Intermittent fasting can help you lose weight if you stick with the intermittent fasting and don't give in to eating when you shouldn't.
To lose 3 % of body weight it can take up to 2 weeks of intermittent fasting and to lose 8% of body weight it can take up to 12 to 24 weeks if you stick with the intermittent fasting.
Exercising along with the intermittent fasting can help you lose the weight much faster and within a year you should be able to lose 100 lbs of weight if that's what you're trying to do.
During intermittent fasting you need to avoid any calories which also means avoiding chewing gum because it also contains calories.
You should be able to lose 1 to 5 lbs per month depending on how often you do the intermittent fasting.