Woooaaahhh, do not reduce water intake and do not keep carbs to an absolute minimum. Bad news.
Carbohydrate will fuel his workouts/fight. If he trains daily with a 'minumum amount of carbs' he will eventually deplete his body of glycogen. Protein will have to be sacrificed for energy so he'll lose muscle mass. Plus it's a terrible idea to go into a fight with low muscle glycogen levels.
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