You’re focused. You use your time well so that you can accomplish as much as possible. Because you’re busy, you don’t have time to exercise, and you grab some fast food because it’s quicker.
That makes about as much sense as trying to save time by never buying gasoline, then having to walk to work when the car dies.
Healthy habits increase our energy and improve both our performance and our satisfaction on the job. It may take more time, but in the end, preserving your own health makes possible everything else you want to do.