BMR is very individual -- the calculators online are just estimates. You can get a more accurate number for your current BMR by visiting a local university or lab that has a device for measuring BMR. One such device is the BodyGem -- you can find a list of locations on their website here: http://metabolicratetest.com/b...rimeter-measure-rmr/

As for how your BMR has changed since losing your colon, harder to say. You can certainly compare your actual measurement now with what the formula would estimate for you, but I don't know of any way to reproduce your pre-colectomy metabolism... Perhaps some intrepid soul who is considering surgery will measure their BMR now and later... for science!!

Gee, my question would be why would you want to know (other than idle curiosity) and what would it matter?

Obviously, strictly speaking, your caloric needs would go down slightly, basically due to the tissue loss that does not create that specific energy demand anymore.

However, if you had active UC, your energy demands would be even higher than just the colon itself, because the diseased colon sheds a huge amount of protein from mucosal layer shedding.

So, depending on that, and your ability to absorb nutrients post op, your BMR and caloric needs may not add up. And, to make your mind really fog over, it is not static and changes as you adapt over time! I guess your scales will tell you how well you are doing in the long run...

Jan

The larger effect might be that if your ability to exercise is improved by getting rid of a diseased colon, you'll be perfectly situated to increase your BMR over time.