Fasting is not merely to give up food, drink and intimacy, but rather it is to be conscious of Allah in everything we do.
The Messenger of Allah (PBUH) said, “There are many who fast, who gain nothing of their fast except hunger; and there are many who stand for the night prayer, who gain nothing of their prayer except sleeplessness” (Ibn Mājah). Thus, we should protect our fasts from being ruined due to our sins.