"Peter Webb"  wrote in message
news:cb7rtc$mic$1{at}darwin.ediacara.org...
> The adaptations that occur in response to cardio training are harder to
> explain. These include increased capillaries, more mitochondria, and
> numerous others. However, none of these seem to have a downside. Being
> fitter in a cardio sense always seems better than being unfit (unlike the
> situation with muscle vs fat). So why does your body lose these
adaptations
> to exercise when the exercise stops? What is the environmental advantage
of
> becomong unfit when we don't exercise? Why doesn't your body just
implement
> the adaptations to exercise even if you aren't exercising?

The responses you describe would seem to increase the requirement for food.
Needing more food is not always adaptive.
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