Ornish diet/lifestyle questions

I am just learning about the Ornish diet and I have a few questions
about several things I do not understand:

1) How can corn and potatoes be acceptable? Aren't they starches that
convert to sugar in the stomach?

2) No nuts and seeds. Legumes are okay. Fine. Technically, peanuts are
legumes. Are peanuts and peanut butter not acceptable?

3) Sugar is not allowed yet in some of Dr. Ornish's recipes, sugar and
honey are sometimes ingredients. What gives?

4) Grains such as whole wheat are okay. Does that make bread okay? If
so, certain sandwiches must be okay then, right? Say, a Polaner fruit
spread sandwich? Ever hear of Ezekiel bread (sprouted grain bread)? Is
this any good?

5) Is popcorn okay? As long as it's air-popped? As long as no oil,
butter, etc. is slathered on it?

6) People on this board often say, for example, "1 cup brown rice". Is
this 1 cup before cooking it or after?

Thank you.