Yes in fact I have found I have more energy and have been extremely productive and require less sleep. I have fasted 21 days annually since 2019. Currently I am water fasting since January 9th and have no issues with not being able to work or complete regular tasks.
Nah. It’s just a desk job. You won’t have any issues. Would be more worried it was in a warehouse or something manual. Sitting at a desk is ideal. I have done up to 14 days and hit 15000 steps a day with no problem.