A Primer on Osmolality
One of the obvious realities of being a runner is that the harder we work, the more energy our bodies burn; thus the more energy we need to replace in order to feed the engine. The ironic twist to that equation is that the harder we work, the more reluctant our body is to absorb the calories it requires. The science is pretty clear; at the pointy end of the output spectrum, our stomach goes offline (to spare blood for use in our legs), and both the quantity and form of calories that we can process becomes limited.
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