we have various responses..
with my peg during rad/chemo treatment, i had no weight change.... steady at around 182.. that's with 2800 cal/day and no problems keeping ensure down. my throat was toast and everything was by tube.
during the following yr, my weight remained constant as i used the tube as i wanted.
so, don't suppose that you will lose weight... not everyone does.... a nutritionist can tell you how many cal/day you should try to consume.
cu,
larryb