Intermittent fasting is a technique where you adjust your eating schedule between two states: the fed state (the period of time during which you eat) and the fasted state (the period of time when you do not eat). This optimizes fat-burning periods when you're cutting, and minimizes fat accumulation during a bulk due to the increase in resting metabolism and utilizing body fat for fuel.
You may drink water or consume extremely low-calorie beverages such as herbal tea and black coffee during the fasted state, otherwise the fasted state breaks and you enter the fed state.
Does chewing gum break intermittent fasting?