Not stupid at all, in fact I asked almost the same thing when I first started Heathers diet! I'm IBS C and assumed that if the greasy fatty food gave most people D, shouldn't it help me go?? I'm sure I won't explain it as medically as Heather did but the basic thing is....
Anytime you eat anything, it signals your colon to contract, something called a peristolic trigger. Most people with IBS D eat something and there colon goes spastic and pushes it out before the body can absorb the excess water and thus you get D. If someone prone to C eats the greasy food it triggers this peristolic reaction and our colons spasm so tight nothing gets through and thats what casues the C. The greasy, fatty food sits like a big lump in our spasmed colon and our body absorbs to much of the water making it even harder to pass.
Eating all safe foods, like rice and pasta(soluble fiber) will keep the colon from spasming. Now I have to be careful to make sure I still get enough insoluble fiber, if I eat nothing but soluble fiber my C is actually worse! Its a balancing act for me, one I'm still working on! If I cheat and do have the big, juicy greasy cheeseburger and fry I do feel SO much worse! Talk about the bloating being even worse than usual if thats possible. Thats the general explanation, I'm sure Heather can elaborate for you!
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Taking it one day at a time.....
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Re: distinction between trigger foods for C and D
