I only have very mild IBS, but my mom used to have it a lot worse -- she told me that she'd have to go 10 times a day, so I assume she had IBS-D! However, for the past 6 months she's been on a diet mainly to lose weight, but was thrilled to find that her IBS is 90% better now! She's also lost about
30 lbs and has now reached her goal weight :) She got the diet plan from a book, I don't remember the name, but here is the gist of it:
With every meal, eat whole grains / fiber, healthy fats, and protein (vegetarian or meat sources). Lots of fruit and veggies. Eat low-fat dairy as snacks or incorporate into meals.
Strictly limit "bad" fats, sodium, and sugar / simple carbs.
Eat a meal or snack every few hours -- you should never get really hungry, and this keeps your metabolism steady.
A typical meal plan:
Breakfast: oatmeal or high-fiber/low-sugar cereal with fruit and nuts, maybe a veggie patty (like imitation sausage) for extra protien if desired.
Lunch: sandwich made from whole wheat bread, turkey, avocado, spinach leaves, a drizzle of vinegairette or a low-fat condiment like mustard.
Dinner: whole grain pasta with sauted shrimp or chicken and veggies; or salmon with sides of brown rice and veggies, etc.
Snacks: fat-free cottage cheese with dried cranberries and cinnamon or light yogurt; fresh fruit and/or nuts, etc.
No desserts, except perhaps something healthy like fruit (quite an accomplishment for a former chocoholic! :) )
Anyways, I know everyone is different and this may not work for everyone, but I just thought I'd share just in case it helps someone!