Term paper on Nutrition

Nutrition Essays

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Nutrition is the science that deals with food and how the body uses

it. All living things need food to live. The food supplies energy, which

people need to perform certain actions. Food also provides substances

that the body needs to build and repair its tissues and to regulate its

organs and organ systems.

Food provides certain chemical substances needed in order for a

person to maintain good health. These chemical substances are called

nutrients. Nutrients can perform three important functions. They provide

materials for building, repairing, or maintaining body tissues. They help

regulate body processes. They serve as fuel to provide energy. The

body needs energy to maintain all its functions. People who do not get

enough nutrients are sometimes lazy and are unwilling to work.

The foods we eat contain thousands of different chemicals. Our

body, however, only needs only a few dozen of these chemicals in order

to stay healthy. These are the nutrients that the body needs. Nutrients

are divided into six main groups. They are (1)water, (2)carbohydrates,

(3)fats, (4)proteins, (5)minerals, (6)vitamins. Water, carbohydrates, fats,

and proteins are called macronutrients. Since macro means large, the

body needs these four nutrients in large amounts. Minerals and vitamins

are called micronutrients (because micro means small). The body needs

only small amounts of these nutrients.

Water is the most important nutrient. Our bodies can survive

without other nutrients for several weeks, but we can only go without

water for about one week. Water is needed in great amounts because

the body consists largely of water. Between 50 and 75 percent of a

normal person's body weight is made up of water. The body needs water

to carry out all of its life processes. Watery solutions help dissolve other

nutrients and carry them to all of the tissues. The body also needs water

to carry away waste products and to cool itself. Adults should drink

about 2 1/2 quarts of water every day.

The carbohydrates, fats, and proteins are needed because they have

nutrients which provide energy.

Carbohydrates include all sugars and starches. They are the main

source of energy for living things. There are two types of carbohydrates,

simple and complex. Simple carbohydrates include sugars and have a

simple molecular structure. Complex carbohydrates include starches and

have a larger and more complicated molecular structure. The structure

consists of many simple carbohydrates linked together.

Fats are a highly concentrated source of energy. All fats are

composed of an alcohol called glycerol and substances called fatty acids.

A fatty acid consists of a long chain of carbon atoms. There are three

types of fatty acids. They are saturated, monounsaturated, and

polysaturated. This is a chart that describes the amount of fat per

serving. The bold words can be found on many food products in the

supermarket.

Fat free: less than 0.5 grams of fat per serving

Saturated fat free: less than 0.5 grams of saturated fat per serving, and the

level of trans fatty acids does not exceed 1% of total fat

Low fat: 3 gram or less per serving and, if the serving is 30 grams or less

or 2 tablespoons or less, per 50 grams of the food

Low saturated fat: 1 grams or less per serving and not more than 15% of

calories from saturated fatty acids

Reduced or Less fat: at least 25% less per serving than compared food

Proteins serve as one of the main building materials for the body.

Skin, cartilage, muscle, and hair are made up largely of proteins. Protein

also contains enzymes which speed up chemical reactions. Cells could

not function without these enzymes. Proteins also serve as hormones

(chemical messengers) and as antibodies (disease fighting chemicals).

Proteins are large, complex molecules made up of smaller units called

amino acids. The body must have a sufficient supply of twenty amino

acids. It can produce eleven of them in sufficient amounts. The nine

others are called essential amino acids. The body cannot make these

amino acids. They must come from food. The best sources of protein

are cheese, eggs, lean meat, fish, and milk. The proteins in these foods

are called complete proteins. They are called this because they contain

adequate amounts of all the essential amino acids. Cereal grains, legumes

(plants of the pea family), vegetables, and nuts also supply proteins to the

body. These proteins are called incomplete proteins because they do not

have adequate amounts of one or more of the essential amino acids.

Although the vitamins and minerals are only needed in small

amounts, they are still important to the body. Minerals are needed for

growth, to maintain tissues, to regulate body functions, and maintenance

of body structures. These minerals are not to be confused with rock

minerals. Minerals are inorganic compounds. This means that they are

not created by living things. The required minerals are calcium,

magnesium, phosphorus chlorine, potassium, sodium, and sulfur.

Calcium, magnesium, and phosphorus are important for the bones and the

teeth. Calcium, which is mostly found in milk products, is also necessary

for blood clotting. Cereals and meats provide phosphorus. Whole grain

cereals, nuts, and lettuce, are good sources of magnesium. People need

only small amounts of minerals each day. Vitamins are needed in order

for a person to have good health. Vitamins regulate chemical reactions by

which the body converts food into energy and tissues. There are 13

vitamins. The main vitamins are A, B-1, B-2, B-12, C, D, E, and K.

Vitamin A is necessary for healthy skin and development of the bones.

This vitamin can be found in liver, green and yellow vegetables, and milk.

Vitamin B-1 is necessary for changing starches and sugars into energy. It

is found in meat and whole grain cereals. Vitamin B-2 is needed for

complicated chemical reactions that take place during the body's use of

food. This is found in milk, cheese, fish, liver, and green vegetables.

Vitamin B-12 is needed for forming red blood cells and for a healthy

nervous system. B-12 is found in animal products such as liver. Vitamin

C is needed for the maintenance of the ligaments, tendons, and other

supportive tissues. Vitamin C is found in fruits and potatoes. Vitamin D

is necessary for the body's use of calcium. Vitamin D is found in milk and

fish. Vitamin E helps maintain cell membranes. It is found in vegetable

oils, whole grain cereals, meats, fruits, and vegetables. Vitamin K is

necessary for blood clotting and is found in lettuce.

A balanced diet is the key to having good health. A balanced diet

includes every kind of nutrient. The food we eat directly effects our

health. A good diet will help prevent certain illnesses and help in the

recovery from others. An improper diet increases the risk of various

diseases. Nutrition experts recommend that the daily diet include a

certain number of servings from each of the five food groups: (1)

vegetables, (2) fruits, (3) breads, cereals, rice, and pasta, (4) milk,

yogurt, and cheese, and (5) meat, poultry, fish, dried beans and peas,

eggs, and nuts.

Energy is important for people to get through their day. The amount

of energy varies for every person....

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