Slippery elm KM? thats interesting. I always have a container of the powder on hand in case any of my four footed ones get a tummy upset. Its very soothing in that way..specially when mixed with just a little good honey...have never thought of it as a laxative. I know it can be purchased in capsule form now.
From the little I know as woman age, specially when you have had children, organs etc can become slightly out of alignment

A prolapsed uterus for example can alter the position of bowel and bladder and cause constipation....and if I am wrong please let me know someone! Would hate to have my facts wrong! As far as I know this is my problem..not the food.
Hope your food plan is going well. Having spent the weekend taking advantage of the lovely weather and putting my big flower garden to bed I have missed out my daily walks..just have to get out there today and get at least half an hours walk before work. Bye for now.