a change in your diet and exercise plan could just mean that your body is flushing excess water you may have been holding prior to your change. Depending on how bad your previous diet was and how much you cleaned it up, there could be enough changes to warrant the body pissing (literally, lol) excess water away. Also, the addition of exercise is likely to increase your fluid intake, and you may not even realize it since youre doing it as a response to thirst and not forcing the extra consumption. Lastly, eating better foods may mean you are consuming more fluids through that means as well, which would also mean the need to flush more water out. Whole foods like fruits and vegetables and even fresh meat contain quite a bit more water than their processed counterparts (in most regards anyways, there are exceptions: damn devious manufacturers add water to some product to increase the weight and make it seem like you are getting more for your money. Processed ham is a good example of this, but i am getting off topic). stick to what you are doing, give your body another week or so to find a new balance, and see what happens then. If you feel any negative effects other than having to pee more often, see a doctor immediately.