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Carbohydrates are one of the three main nutrients in food. Alternative names for carbohydrate are Starches; Simple sugars; Sugars; Complex carbohydrates; Diet - carbohydrates; Simple carbohydrates. Carbohydrates (carbs) are the body's major source of energy. There are two main types of carbohydrates - sugars and starches.

The body breaks down carbs into the sugar glucose, which the body's cells need. Glucose is absorbed into the bloodstream, which makes the sugar level in the blood go up. As the sugar level rises in the body, the pancreas releases a hormone called insulin. Insulin is needed to move glucose from the blood into the cells, where it can be used as a source of energy.

Food Sources

Carbohydrates are classified as simple or complex. The classification depends on the chemical structure of the particular food source and reflects how quickly the sugar is digested and absorbed. Simple carbohydrates have one (single) or two (double) sugars while complex carbohydrates have three or more.

Examples of single sugars from foods include fructose (found in fruits) and galactose (found in milk products). Double sugars include lactose (found in dairy), maltose (found in certain vegetables and in beer), and sucrose (table sugar). Honey is also a double sugar, but unlike table sugar, contains a small amount of vitamins and minerals.

Complex carbohydrates, often referred to as "starchy" foods, include:

  • Whole grain breads and cereals
  • Starchy vegetables
  • Legumes

Simple carbohydrates that contain vitamins and minerals occur naturally in:

Simple carbohydrates are also found in processed and refined sugars such as:

  • Candy
  • Table sugar
  • Syrups (not including natural syrups such as maple)
  • Regular (non-diet) carbonated beverages, such as soda

Refined sugars provide calories, but lack vitamins, minerals, and fiber. Such simple sugars are often called "empty calories" and can lead to weight gain. Also, many refined foods, such as white flour, sugar, and polished rice, lack B vitamins and other important nutrients unless they are marked "enriched." It is healthiest to obtain carbohydrates, vitamins, and other nutrients in as natural a form as possible -- for example, from fruit instead of table sugar.

Side Effects

Excessive carbohydrates can cause an increase in the total caloric intake, causing obesity.

Deficient carbohydrates can cause a lack of calories (malnutrition), or excessive intake of fats to make up the calories.


For most people, between 40% and 60% of total calories should come from carbohydrates, preferably from complex carbohydrates (starches) and naturally occurring sugars. Complex carbohydrates provide calories, vitamins, minerals, and fiber.

Foods that are high in processed, refined simple sugars provide calories, but they have few nutritional benefits. It is wise to limit such sugars.

To increase complex carbohydrates and healthy nutrients:

  • Eat more fruits and vegetables.
  • Eat more whole grains, rice, breads, and cereals.
  • Eat more legumes (beans, lentils, and dried peas).

Here are recommended serving sizes for foods high in carbohydrates:

  • Vegetables: 1 cup of raw vegetables, or 1/2 cup cooked vegetables, or 3/4 cup of vegetable juice
  • Fruits: 1 medium size fruit (such as 1 medium apple or 1 medium orange), 1/2 cup of a canned or chopped fruit, or 3/4 cup of fruit juice
  • Breads and cereals: 1 slice of bread; 1 ounce or 2/3 cup of ready-to-eat cereal; 1/2 cup of cooked rice, pasta, or cereal; 1/2 cup of cooked dry beans, lentils, or dried peas
  • Dairy: 1 cup of skim or lowfat milk

Here is a sample 2,000 Calorie menu of which 50-60% of the total calories are from carbohydrates.

  • Breakfast
  1. 1 cup of raspberries
  2. 1 1/2 cups of unsweetened cereal, with 1/2 sliced banana
  3. 1 cup of skim milk
  4. 1 slice of whole wheat toast
  5. 1 teaspoon of margarine
  6. 1 teaspoon of jelly
  7. Coffee or tea

  • Lunch
  1. turkey pita pocket sandwich (2 slices of whole wheat pita bread, 3 ounces of lean turkey breast )
  2. 1/2 cup of shredded lettuce
  3. 1/2 cup of diced tomatoes
  4. 1/2 cup of green peppers
  5. 1 tablespoon of salad dressing
  6. 1 cup of skim milk
  7. 2 fresh, medium-sized peaches
  • Dinner
  1. 4 ounces of broiled salmon with 3 tablespoons of lemon juice, sprinkled with paprika
  2. 1 cup of pasta
  3. 1 dinner roll
  4. 1 steamed broccoli stalks with black pepper
  5. salad:
    1 cup lettuce
    1/4 cup of sliced mushrooms
    1/2 cup of sliced tomatoes
    1/2 cup of sliced carrots
    1 tablespoon of salad dressing
    1/2 cup frozen unsweetened strawberries, sweetened with 1 teaspoon of sugar
    1-inch slice of angel food cake
    1 cup of skim milk

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