Yes, you can be sure of that! You are what you eat, breathe, and drink. To get technical, even your skin absorbs sustenance. Add it together through the course of history, and this is you. Time passes, and so have most cells that compose your entire body. Most of “you” is replaced time and again, and the material used is what you consume. So do yourself a favor and drink well in a good place where the air is clean and the food is good!