90 to 130 is a big range. 90 wouldn't be enough for me on the training schedule you're keeping. My understanding is it's only hard on your kidneys if you're not using the amino acids to build or repair muscle. But I'll defer to those with more knowledge of the subject.




If you don't have enough when you need them, you start converting amino acids (from muscle) to glucose--muscle and many other tissues can use fat and its breakdown products for fuel, but your brain and red blood cells are pretty much dependent on glucose.
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So, increasing quality carbohydrates will also benefit your workouts and help insure that your workouts don't result in losing muscle.
