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What is a Nutrient?

A nutrient is any substance in food that:

Provides energy
Helps your body "burn" another nutrient to provide energy
Helps build or repair tissue

The different types of nutrients include:


About Proteins

Proteins are an important part of your bones, muscles, and skin. In fact, proteins are in every living cell in your body. Inside cells, proteins perform many functions, including:

Helping to break down food for energy
Building structures
Breaking down toxins

Proteins are made up of building blocks called amino acids. Your body can make some amino acids but not others. Proteins that you get from meat and other animal products contain all the amino acids you need. These include both those your body can make and those it can't. Proteins from meat and other animal products are known as complete protein.

Proteins from plant products are incomplete proteins. That means that the proteins from one plant product don't contain all the amino acids your body needs. But another plant product may have the amino acids that the first one is missing. To get complete protein from plants, you need to eat a variety of plant foods. For instance, eating rice with beans or peanut butter with bread will give you complete protein.

You may have seen ads for protein powders and shakes that say their products contain amino acids that your body can't make. Although this is true, most people can get all the protein they need from food and don't need protein supplements.

Good Sources of Protein
Good sources of protein include:

Fish and shellfish
Red meat (beef, pork, lamb)
Peanut butter
Nut butters
Soy products (tofu, tempeh, vegetarian burgers)
Milk products (cheese, cottage cheese, yogurt)

About Carbohydrates

The foods you eat contain different types of carbohydrates (kar-boh-HEYE-drayts). Some kinds are better for you than others. The different types of carbohydrates are:

Sugars are found naturally in fruits, vegetables, milk, and milk products. Foods such as cakes and cookies have had sugars added. Table sugar also is an added sugar. All of these sugars can be converted in your body to glucose, or blood sugar. Your cells "burn" glucose for energy.
Starches are broken down in your body into sugars. Starches are found in certain vegetables, such as potatoes, beans, peas, and corn. They are also found in breads, cereals, and grains.
Dietary fibers are carbohydrates that your body cannot digest. They pass through your body without being broken down into sugars. Even though your body does not get energy from fiber, you still need fiber to stay healthy. Fiber helps get rid of excess fats in the intestine, which helps prevent heart disease. Fiber also helps push food through the intestines, which helps prevent constipation. Foods high in fiber include fruits, vegetables, beans, peas, nuts, seeds, and whole-grain foods (such as whole-wheat bread, oatmeal, and brown rice).

Healthy and Unhealthy Carbohydrates
In general, you want to limit carbohydrates that increase your blood glucose levels. If your blood glucose stays high for too long, you can develop type 2 diabetes. To keep your blood glucose in check, limit the amount of table sugar you eat. Also, limit foods with added sugars. You can tell if a food has added sugars by looking at the ingredients list on the package. Look for terms such as:

Corn sweetener
Corn syrup
High-fructose corn syrup
Brown sugar
Invert sugar
Malt syrup

You also should limit the amount of white potatoes you eat. Eating white potatoes occasionally is fine because they contain important vitamins and minerals. But your body rapidly digests the starch in white potatoes. This can raise your blood glucose level.

Healthy carbohydrates include:

Natural sugars in fruits, vegetables, milk, and milk products
Dietary fiber
Starches in whole-grain foods, beans, peas, and corn

About Fat

Your body needs some fat to function properly. Fat:

Is a source of energy
Is used by your body to make substances it needs
Helps your body absorb certain vitamins from food
But not all fats are the same. Some are better for your health than others. To help prevent heart disease and stroke, most of the fats you eat should be monounsaturated (mon-oh-uhn-SACH-uh-ray-tid) and polyunsaturated (pol-ee-uhn-SACH-uh-ray-tid) fats.

Foods high in monounsaturated fats include:

Olive oil
Peanut oil
Canola oil
Most nuts

Foods high in polyunsaturated fats include:

Safflower oil
Corn oil
Sunflower oil
Soybean oil
Cottonseed oil

Healthy and Unhealthy Fats

Omega-3 (oh-MAY-guh) fatty acids are a type of polyunsaturated fat that appear to reduce your risk of heart disease. Good sources of omega-3s are fatty fish. These include salmon, trout, herring, mackerel, anchovies, and sardines. You can also get omega-3s from plant sources. These include ground flaxseed (linseed), flaxseed oil, and walnuts. Small amounts are also found in soybean and canola oils.

Less healthy kinds of fats are saturated and trans fats. They can increase your risk of heart disease by causing the buildup of a fatty substance in the arteries carrying oxygen-rich blood to your heart. When this happens, your heart does not get all the blood it needs to work properly. The result can be chest pain or a heart attack. These fats can also increase your risk of stroke by causing the buildup of the same fatty substance in arteries carrying blood to your brain. Research also suggests that eating lots of trans fats may increase your risk of breast cancer.

Foods high in saturated fats include:

Red meat (beef, pork, lamb)
Whole milk and whole milk products
Coconut oil
Palm oil
Trans fats are found in foods made with hydrogenated (heye-DROJ-uh-nay-ted) and partially hydrogenated oils. Look on the ingredients list on the food package to see if the food contains these oils. You are likely to find them in commercial baked goods, such as crackers, cookies, and cakes. Trans fats are also found in fried foods, such as doughnuts and french fries. Stick or hard margarine and shortening are also high in trans fats.

As with saturated and trans fats, eating too much cholesterol (koh-LESS-tur-ol) can raise your risk of heart disease and stroke. Cholesterol is a fat-like substance found in animal products, such as:

Red meat
Egg yolks
Milk and milk products
Although monounsaturated and polyunsaturated fats are better for your health than saturated and trans fats, eating large amounts of any fat can cause weight gain. You should eat fats in moderation. And make sure that fatty foods don't replace more nutritious foods, such as fruits, vegetables, and whole grains.

About Vitamins

Vitamins are substances found in foods that your body needs for growth and health. There are 13 vitamins your body needs. Each vitamin has specific jobs. Below is a list of the vitamins, some of their actions, and good food sources.
About Minerals

Like vitamins, minerals are substances found in food that your body needs for growth and health. There are two kinds of minerals: macrominerals and trace minerals. Macrominerals are minerals your body needs in larger amounts. They include calcium, phosphorus, magnesium, sodium, potassium, and chloride. Your body needs just small amounts of trace minerals. These include iron, copper, iodine, zinc, fluoride, and selenium.

Water is an important part of your body. In fact, it makes up more than 60 percent of your body weight. Among other functions, water:

Moistens tissues, such as those around your mouth, eyes, and nose
Regulates your body temperature
Cushions your joints
Helps your body get nutrients
Flushes out waste products

How Much Water Should I Drink?

Without water, you would die in a few days. So it's important that you get enough water. But how much water is enough? Experts generally recommend that you drink six to eight 8-ounce glasses of fluid every day. But it doesn't have to be all water. You could satisfy some of your fluid needs by drinking milk, tea, soda, coffee, or juice, which are composed mostly of water. Just remember that juice and sodas are high in sugar. Many fruits and vegetables, such as watermelon and tomatoes, are also mostly water.

If you're being physically active and sweating a lot, you'll need more fluid. You'll also need more if the weather is hot. Women who are pregnant should drink about 10 cups of fluids daily. And women who breastfeed should drink about 13 cups of fluids daily.

It's generally not a good idea to use thirst alone as a guide for when to drink. By the time you're thirsty, you may already be a bit dehydrated. On the other hand, you don't need to be constantly carrying around water bottles and drinking lots of water. You are probably getting all the fluid you need if you are rarely thirsty and you produce a little more than six cups of colorless or slightly yellow urine a day. Dark urine can be a signal that you need more fluid
Healthy Eating
Nutrition Basics

On this page you will find a good detail most important food nutrients.