6. White flour
Remember when wonder bread made the greatest sandwich? Your 30-something body deserves better. White flour is on the no-no list.
Your body converts white flour into glucose. Glucose is very easily stored as fat. White flour is refined of all the good stuff like fiber. Whole grains are more slowly digested and will help you stay full longer.
Whole wheat and whole grain breads can be an acquired taste, but it is an important one.