Hi Dhara,
1] A high protein diet is given for weight loss only in case where the person is working out... so that the person doesnt lose the lean body mass, but only the extra fat weight. for those who are not working out, the extra protein might not really work for weight loss, but may rather lead to increse in the muscle weight of the body. hence we can decide on the protein part only if you are working out.
2] same again , whether or not protein will work in weight loss depends on the above mentioned factor, and anywaz protein are a little difficult to digest, taking too much protein for you dinner might lead to indigestion , gas formation and other such problems, hence it is best to avoid too much protein for dinner, if you are taking mung soup, for dinner, nmake sure that the amount of water is more , and a very minimum amount of mung used. if possible, take this soup at around 7.00 - 7.30, to make sure that it gets digested well.
3] dont decrease your water intake, as your body needs a lot of water while you are on a weight loss regime, to get rid of the toxins produced in the body due to increased metabolic rate as well s the break down of the fat cells. rather more is the urination , healthier is the weight loss. the weight increse that u notice after so much of water intake is becoz, your weight is not only your fat weight but also , muscles , bones and water in ypour body contribuite to the weight. water being highly mobile, it quickly shifts to the instestine , and you will notice an increased frequency of urination. hence dont worry abt this weight, as this will be gone at the end of day. just make sure , you dont over do this and bloat your stomach, it will leave you with a very uneasy feeling, hence take only a glass or 2 at one time, and keep some gap for your next water intake.