WHY AM I TIRED AFTER INCREASING PROTEIN INTAKE?

I AM 6 MONTHS POST OP AND LOST 118 POUNDS. I HAVE HIT MY FIRST "REAL" PATEAU SO I HAVE INCREASED MY PROTEIN AND WATER INTAKE. I KNOW I NEED TO INCREASE MY WALKING ALSO BUT I HAVE A QUESTION. SINCE I HAVE INCREASED THE PROTEIN I AM VERY TIRED. CAN ANYONE EXPLAIN?????

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