Hi, Ditto, what Ladyhope shared. This is the place for you to come, to learn, to ask questions and to share.
I was 15 when I had my surgery (I'm 66 now) and even though the doctor had me on a "soft diet", to introduce me to foods slowly, I had a piece of pizza (unknown to my parents and doctors) the week after surgery. After being on a very restricted diet for nearly 4 years, I wasn't going to let anyone tell me what to eat. (Finally, I could rebel). So, as every teen does, I learned the hard way.
The best way to start out is with easily digested foods. I didn't do that. I quickly found out that vegetables needed to be very well cooked. I found I could eat raw salad, but not raw carrots or cabbage. But I could eat sauerkraut? Very strange. Balancing "roughage" with carbs (bread or potato) has been important for me. Too much roughage can cause a slight blockage or a case of the "runs". Remember, with an ileostomy, you don't have a colon, and so too much roughage can slow down the passage of food, but the "churning" can cause a loss of fluids. It's really very individual. I love fresh corn on the cob, but only the little "white" silver queen variety agrees with me. I can eat some nuts and not others.
Proteins are generally not a problem, but foods like eggs and fish can cause an odor issue. There are products you can use to put in the pouch to reduce the odors. Some people are very sensitive to spicy foods, while others have no problems with it at all.
So remember to take it slow, and give yourself the chance to test out the foods that interest you. I've made a big switch recently... to more whole grain foods (getting rid of the white stuff). I always thought my system wouldn't tolerate it, but I've found that it hasn't been an issue. I've discovered "healthier eating is better for me", because Ulcerative Colitis is a systemic disease, and although the colon is gone, it can still be present in the body. The elimination of targeted foods (white stuff, dairy, red meat) has resulted in less inflammation (my gums healed) and feeling healthier in general.
Best of luck to you...