| Energy from the foods we eat
come from four classes of nutrients: carbohydrates, protein, fat, and alcohol. With 9 calories per gram, fat is the most energy-dense of the nutrients. Carbohy- drates and protein contain 4 calories per gram, while alcohol contains 7 calories per gram. Although alcohol is very energy- dense, it is extremely deficient in nutrients. A key to remember when consuming nutrients is that ANY nu- trient consumed in excess of bodily needs is converted to fat for storage. Simply put, there is no one nutrient category more "fat- tening" than another, which is one of the main difficulties for the American public trying to understand and maintain a healthy bal- ance in their diets. |
| The
role of carbohydrates is to supply the body with the fuel
(glu- cose) that is uses for energetic production. The consumption of car- bohydrates helps to spare proteins to be used for their role in repair and building. Carbohydrates are found almost exclusively in plant foods, such as fruits, nuts, vegetables, grains, peas, and beans. Out of animal foods, only milk and mild products carry a significant amount of carbohydrates. Carbohydrates come in two forms: 1. Starches (or complex carbohydrates), and 2. Sugars (or simple carbohydrates). Simple carbohydrates are also called simple sugars, and they in- clude fructose (sugar from fruits and honey), lactose (sugar from milk), and sucrose (table sugar). Because of the high concentration of sugars, fruits are a natural source of simple sugars. Complex carbohydrates are sugars that are formed of a more complex, longer chain. Fiber and starch are forms of complex car- bohydrates, and can be found in foods such as beans, peas, vege- tables, and whole grains. For your diet, unrefined foods such as fruits, vegetables, beans, peas, and whole grain products will serve you best as opposed to refined foods, such as candy, soda, desserts, and sugar. Large amounts of simple carbohydrates in unrefined foods have been linked to certain disorders such as diabetes and hypoglycemia (low blood sugar). And in addition to potential health problems, un- refined foods are generally very high in calories and fats and offer very little, if any, of the vitamins and minerals needed in a well bal- anced diet. Your best bet is to limit the consumption of simple carbohydrates isolated from foods. These refined sugars should not exceed 10% of the total carbohydrate intake due to the fact that these food sources have no nutrient value. |
| The
role of fat is an important one in the body. Dietary
fats, or lipids, can be broken down into two types of basic components: 1. animal fats - generally very high in saturated fat 2. plant fats - higher in monounsaturated fats, such as olive, peanut, and canola oils. 95% of the fat you consume is in the form of triglycerides, which also happens to be the major storage form of fat in the body's fat tissues. The role of fat in the body is to cushion vital organs, provide in- sulation against rapid heat loss, and is involved in nerve conduction and the structure of body tissue. Fat is also a player in the absorp- tion and transport of fat-soluble vitamins (a, d, e, k) and essential fatty acids. The current U.S. dietary goal is to reduce fat intake to no more than 30% of total calories, and intake of saturated fat should be no more than 10%. |
Protein is essential for
growth and development and is known as |
ESSENTIAL
AMINO ACIDS |
| Water,
which composes approximately 70 percent of the human body, is the most basic nutrient and is essential to life. H20 is the main transporter of nutrients, helps maintain body temperature, is the liquid form for cell processes, and is essential for carrying waste from the body. Water intake requirement can be simply equated as one quart to every 1,000 calories consumed. The body may be able to survive up to several weeks without food, but it cannot survive without water for longer than five days. Water is absorbed from food and liquids through the stomach, mainly in the large intestine, but the rate of absorption depends on the temperature of the water. Intake of H20 comes from water within solid foods, liquids and through water within the cells from oxidation. The intake of water should balance the output of this nutrient from stool and urine ex- cretion, sweat, and respiration loss. |
| Photo: Grove Pashley |