Yes I had all the test done including absorbtion, and ill presume overcome has too. Dont know what you've tried must overcome, if you say what you've tried someone on here might be able to suggest something new to try.it was actually 15,000 calories but keep in mind a very high % of that is through additional suppliments, ie calcium/calorie drinks such as the ones you give to elderly people to make sure they are getting enough, plus proteen drinks such as you would take if you were on an exercise regime and so on. So it wasn't all food though I did have 7 meals a day.Though my doctors like many don't have the greatest of understandings of IBS, and I have even less, they have said something to the effect of a lot of the nutriants will be flushed out as D, I know I have a fast metabolism and my last good doctor was in the process of working out a theory that my other doctors do not carew about, he thinks my body uses a large amount of calories just in normal operation but he has also noticed that at various times (more so when ill or having an IBS epesode) that my thyroid and liver start to ramp up their activity which obviously uses up a lot more energy. He thought this could be a problem as if my body keeps doing this often not only will i struggle to gain weight but more so that it might cause too much stress on my liver and cause issues later in life, my other doc's who have looked at the results just think the readings where high but as it was for a short period of time it doesn't matter.I know alot about finance and very little about biology so I dont even know if i have the story right let alone an opinion on what to believe. To be honest if I can stop the ibs symptoms the D, stomach crtamps, sickness, headaches, dizziness, hot flushes and the fact i get cramps in hands and feet as well as going red and blue id be happy enough with that.