Your body is not an inconvenience standing between you and productivity.

Treating the body as an obstacle sets up a fight you cannot win, since the thing you are fighting is the only means you have of doing anything. Its needs are not interruptions to the work, they are the conditions under which work is possible at all. The frustration usually comes from a plan that never accounted for a human being carrying it out.

When you feel irritated at needing to eat, sleep, or move, notice the framing. Adjust the plan rather than resenting the requirement. The requirement is not going to change.