Thursday, November 29, 2007

Our Food 2

An overview of how dietary fat gets digested, packaged, and sent to various tissues for storage or energy.

Energy and Ecosystems (Natural Environments)

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Photosynthesis: energy from the sun is captured by plants and used to make food. Most of this energy is used to carry on the plant's life activities, the rest of the energy is passed on as food to the next level of the food chain.

Energy flows in a simple food chain. At each level of the food chain, about 90% of the energy is lost in the form of heat. Therefore, as you move up the food chain, there is less energy available.

NOTE!! Each organism in the food chain is only transfering one-tenth of its energy to the next organism.

Energy and Ecosystems (human impacts)

People can impact their environment in negative ways. For example, water contamination pollutes otherwise clean water. As a consequence we can no longer use that water to grow our food or to drink. Contaminated water becoimes a poison.

This film is based on the the brief to develop sustainable housing for urban megalopolis in China in 2020.

Our food (Food labels)

Food Labels Tell the Story!

From the Label to the Table!

Rosie in an apron

What is in food?

Food provides your body with all of the materials it needs to grow, and to be healthy and active. These are some of the building blocks in food.

CARBOHYDRATES are the body's main source of fuel. Starchy foods like breads, spaghetti, rice, potatoes, corn and cereals are made up mostly of carbohydrates. Sugary foods like candy, jam and syrups also are carbohydrates. Some carbohydrates, called fiber or roughage, are hard to digest. They help move waste through the digestive system.

FATS include butter, margarine, lard, shortening, and cooking oil. Cheese, cream, chocolate, some meats and many desserts have a lot of fat. Fats are very concentrated sources of energy, so only a little is needed.

PROTEINS, are important for growth and repair of the body. Protein-rich foods include eggs, milk products, meat, dried beans, chicken, turkey, and fish. The body also can use protein as fuel for movement and growth.

MINERALS are found in small amounts in foods. They are needed for many of the body's functions. For example, calcium is used to build bones and teeth, and also is important for muscles and the nervous system. Iron becomes part of red blood cells.

VITAMINS are other chemicals found naturally in food. They are needed in very small amounts by the body.

Did you know that WATER also is a major part of almost all food?

picture of a food label with the above notes shown for each section

Nutrition Facts -- the Labels on Food Products

Beginning in 1994, the US government began requiring manufacturers to put information about nutritional value on food labels. You can use this information to make better choices about what you eat -- watch for the following information:

  1. Pay close attention to serving sizes.

  2. Products labeled "light" or "lite" must have 1/3 fewer calories or 1/2 the fat of the foods to which they are compared. "Light" also can mean that salt has been reduced by 1/2.

  3. Look for foods with lower levels of saturated fats.

  4. The sodium level tells you how much salt is in food.

  5. Look for Products that have more fiber and less sugar.

  6. Vitamins and minerals help your body function properly.

  7. Calcium is important for bones and teeth.

  8. Use the "percentage of daily values" section of the label as a guide for daily planning.

  9. The amount of calories a person needs each day depends on many factors, including exercise.


Wednesday, November 28, 2007


Food web

The Energy Chain

Did you know that bears climb trees because of the sun?
Sun Plant Bear Bear Climb
AEnergy from the sun creates wind and rain. The wind helps scatter seeds for new plant and tree growth. Rain provides needed water.
BTrees and plants grow because they take energy from the sun and convert it to CHEMICAL ENERGY through a process called PHOTOSYNTHESIS. The chemical energy is stored in the plant as potential energy.
CWhen a bear eats a plant, the stored energy from the plant is converted to muscle energy...

...and the bear can climb a tree! So the sun allows the tree to grow and gives the bear the energy to climb it!

Water cycle