Since having a stoma, I can't eat most fruit and veg, they cause blockages. I assume the same would be true for whole grains, nuts and seeds, so I've never tried them.
I'm actually just a few weeks post-op from another surgery right now, which gave me my third stoma. I'm actually feeling positive about food, as I feel so much better than before the surgery! I'm eating a lot of low-fibre breakfast cereals, bananas, pureed fruit, biscuits, puddings (in hospital they were serving me sponge and custard a lot), crackers and cheese, eggs, sandwiches on white bread (tuna, salmon). For main meals, I've been eating home-made things: shepherd's pie (with no onion!), chicken, rice, roast dinners (lean meat with very well cooked veg and gravy), with some vegetables - avocados, well-cooked carrots and broccoli. I've also been craving toffees, and eating lots of them! Eating homemade bread too. And now my stomach has settled I'm back to drinking Coke, though I'm not sure that would be a good idea for everyone!
(Immediately after surgery, in hospital, I was on bowel rest at first, having TPN, then built up to pureed food, soup and yoghurt, Fortisip supplements, then soft food, over the course of a several days, before moving to a normal but strictly low fibre diet.)