I'd like Steve to write about how to measure the improvements that the life hacks we apply to our selves impact on our performance. For instance, if I try a vegan diet how could I measure whether my alertness, consciousness, intelligence and overall well being improves or not compared to a vegetarian diet, for instance.
I'm I true believer on the phrase "If you can not measure it, you can not improve it", but seems to me that personal performance is an elusive dimension to measure.
Thanks.
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