Diet after DS
Since whatever you eat is technically your 'diet', I suppose there is one after the DS. But it's not like any 'diet' you've ever been on!
Most DSers, once they reach maintenance, eat 2500-3000 calories a day. Most eat 125+ grams of protein a day, all the fat we care to (since we only absorb abut 20% of it, and the body needs at least 30 grams a day to function properly. That means we need a minimum of 150 grams, in order to absorb 30.)
I will soon be 11 years post-DS. A typical day for me would be a half-pound of bacon and a couple of eggs for breakfast, some sort of meat/veggie/sauce casserole for lunch, and dinner might be a steak, salad, a few bites of baked potato, a yeast roll, and a few bites of dessert, along with a glass or two of tea. Along the way, I'll have a couple of snacks, typically cheese, nuts, meat, etc.---something high in protein and fat.
I try to be moderate in my carb intake, but there is NOTHING that I simply never eat. (Unless, of course, I just don't LIKE it!)
There are several FB DS-centered groups where you can talk with long-term DSers. (5+ years post-op.) Everyone's a bit different, but you can get a good idea of what's typical.
