Testing postprandial informs you how the foods you ate affected your glucose levels
. Pretty simple, avoid those that do.
Here are a few foods to avoid; foods made with white flour [breads, crackers], white rice, pasta/noodles [except Dreamfields brand], starches like potatoes. Eat quality proteins like fish and fowl, nuts and seeds, beans and legumes, fresh vegetables and small amounts of whole grains.
Lastly, exercise 30-60 minutes after meals not before.