You can't have instant oats because of the GI. Since they're broken down into such small pieces, they have a higher GI and thus are absorbed more quickly by your system, which means you'll feel hungry sooner than if you'd eaten steel cut or slow-cooking oats. A serving size is 1/2 c uncooked oats made with 1 cup of skim milk (or water, if you prefer). You put that in the microwave for 2 1/2 minutes, stir, then microwave another minute or two (make sure to watch it because the oats have a tendency to boil over). You can mix in fruit if you like (oats and fruit are both acceptable after the first two weeks of the SBD). I buy my oats from Asda...these:
They're 38p for 500g!
Green beans are fine, too! If you're going with canned, you need to make sure they aren't packed in sugared water (this holds true for all canned veggies). Like I said before, I do limit sweetcorn, petit pois, and parsnips because they're relatively high GI....they're okay in small quantities though. Honestly, though, having been doing the SBD for a while, I've kinda lost my taste for stuff that's overly sweet -- I have to choke down a piece or two of roasted parsnip...more than that and it's just too much sweetness!
You can also have wholemeal bread in Phase 2 -- I've been making my own, but Asda's fresh for a week wholemeal bread is perfectly acceptable as well! Wholemeal pitas have become my snack of choice....with a little sundried tomato hummus....mmmmmmmmmmmm!
If you're doing the SBD, I really would suggest that you pop into
www.southbeach-diet-plan.com/forum if you have any questions or just want to talk to other people who are doing it. I've found some really good recipes over there and the FAQs are very comprehensive and the people are very supportive.