youre not a big fan of IIFYM because of amino acids? w0t?
The only way sodium makes you hold extra water is when your intake is all over the place. When you have a constant intake level, no matter how high or low, your water retention will remain the same. There is this hormone called aldosterone that is responsible for the reabsorbtion of sodium filtered through the kidneys. It's levels move around based on your sodium intake and you either excrete more or less sodium through urine based on it.
http://hyper.ahajournals.org/content/15/4/376.full.pdf
Also physically active people need WAY more sodium than sedentary people because you lose a ton through sweat. ELECTROLYTES
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There is absolutely zero evidence that keto is superior to any other dietary guidelines in the healthy population, especially in fat loss.
Makronutrient, Mikronutrient, ketons, this guy can spell!