Complex Carbohydrates
Both fiber and starch are polysaccharides, meaning they are made up of many units of sugar and resemble a long chain. 
Plant foods, including grains, potatoes and legumes, contain starches.
All carbohydrates, except for fiber, are broken down by your body into monosaccharides as your body digests them. Your body breaks them down into simple sugars so they can be absorbed in your bloodstream and then transported to your cells and converted to energy.
What about fiber, you ask? Fiber isn’t completely broken down in your digestive tract, and some of it remains whole in your body because you lack the enzymes to break it down. This actually confers numerous health benefits.
Kari Hartel, RD, LD is a Registered, Licensed Dietitian and freelance writer based out of St. Louis, MO
