There are three principal classes of dietary carbohydrates: _______, _______, and _______.

Each gram of lipids yields _______ calories of _______, while each gram of carbohydrates or proteins yields _______ calories.

To say that a carbohydrate is a source of “empty calories” is to say that it provides very few _______ or _______.

Proteins move from the digestive system into circulation in the form of their building blocks, _______. Nearly every _______ source of protein supplies us with a complete, balanced set of _______, but this usually is not the case with proteins that come from ______ sources.

Glycemic load is a measure of how _______ levels are affected by defined portions of given carbohydrates. The _______ the glycemic load, the better, in terms of health.

To be classified as a nutrient, a substance we ingest must do at least one of three things: It must provide us with _______, it must serve as a _______, or it must help _______ the body’s physical processes.

The six classes of nutrients are _______, _______, and _______; and _______, _______, and _______.

Minerals are chemical _______, while vitamins are chemical _______. Because vitamins do not help form bodily structures, every vitamin is needed in strictly _______ amounts.

The central structure of the digestive system is a muscular tube called the ______ that passes through the body from the _______ to the _______•

Eighty percent of our nutrients make the transition out of the digestive system along the length of the _______.

A central function of the digestive system is to get food into a form that can move into the _______.