Downloadable mobile applications for starting and ending a timer for use in connection with fasting, that can be controlled with one tap; Downloadable mobile applications for customizing fasting plans, and adjusting plans for fasting and eating periods; Downloadable mobile applications for setting notifications for fasting; Downloadable mobile applications for setting a fasting timer; Downloadable mobile applications for checking a user's fasting status by reviewing and analyzing fasting schedules and logs; Downloadable mobile applications for providing science-based tips and articles about fasting; Downloadable mobile applications for providing various intermittent fasting plans for both beginner and experienced users; Downloadable mobile applications for tracking your weight and fasting; Downloadable mobile applications for syncing data to the platforms of others