This just doesn't seem to be empirically true. When I took on demanding jobs I found that I needed to exercise more as I'd need to concentrate for longer stretches of time.
The first position that I took out of college was a fairly demanding (in a good way) and challenging position. At the time I was overweight and began experiencing some early stage diabetes symptoms (constant thirst, fatigue). I've found that I'd want to do more work but lacked the energy. Losing weight and developing a habit of exercise greatly changed that and I have been able to not only work longer hours, but to more productive when working same hours.
Some of the most "hard core" entrepreneurs I know specifically make a point of exercising, even if they do nothing else besides work the entire day.
I also wonder if there any other needs that, if neglected, greatly impact immediate performance (in addition to just being a sort of "deficit spending" in the long term): e.g. if one is an extrovert and is left with no time for social/group interaction is their performance degraded as well (and conversely if an introvert spends all of his time working in a high-interruption open office environment)?
The first position that I took out of college was a fairly demanding (in a good way) and challenging position. At the time I was overweight and began experiencing some early stage diabetes symptoms (constant thirst, fatigue). I've found that I'd want to do more work but lacked the energy. Losing weight and developing a habit of exercise greatly changed that and I have been able to not only work longer hours, but to more productive when working same hours.
Some of the most "hard core" entrepreneurs I know specifically make a point of exercising, even if they do nothing else besides work the entire day.
I also wonder if there any other needs that, if neglected, greatly impact immediate performance (in addition to just being a sort of "deficit spending" in the long term): e.g. if one is an extrovert and is left with no time for social/group interaction is their performance degraded as well (and conversely if an introvert spends all of his time working in a high-interruption open office environment)?