This is for the question about simple carbs.
Complex carbs are the healthy ones-fruit, vegetables, and WHOLE grains like brown rice, oatmeal, and WHOLE grain bread and cereals-like shredded wheat.
Simple carbs are the processed ones-white flour, white bread or any bread, even wheat, that is not "whole" grain. What this means, is that if it is not whole grain, then the grains have been overly processed-meaning not as much nutrition, fiber, etc. in them. Most popular cereals are also processed-Frosted Flakes, Corn Pops, and the like are so overly processed that they hold none of the nutrition of the natural grain. Sugar is also a simple carbohdrate. Fruit is a complex carb-but fruit JUICE is a simple carb-because all of the pulp, skin, and elements that contain the nutrients and fiber have been stripped away-leaving you with only the juice.
Donuts and pastries are the worst-because they are a double dose of simple carbs-the white flour and sugar combo.

