I'm a healthy 36 year old female. I can eat homemade meals or boxed dinners with no issues. I'm able to eat string cheese, pizzas, drink milk, eat breads, have toast, add butter to anything, eat tuna, any kind of fish, eat mushrooms, and more. Now if I eat a grilled cheese, it makes me constipated. If I eat Tuna Helper, I get diarrhea. How is that possible??