Agriculture
Growing Healthier Tomato Plants
Hungry bug seeks hot meal
Chicken Eggs as Drug Factories
Amphibians
Frogs and Toads
Salamanders and Newts
Tree Frogs
Animals
Roach Love Songs
G-Tunes with a Message
Professor Ant
Behavior
The chemistry of sleeplessness
Why Cats Nap and Whales Snooze
Supersonic Splash
Birds
Mockingbirds
Swans
Doves
Chemistry and Materials
Small but WISE
Putting the Squeeze on Toothpaste
Gooey Secrets of Mussel Power
Computers
The solar system's biggest junkyard
It's a Small E-mail World After All
Supersonic Splash
Dinosaurs and Fossils
Ancient Critter Caught Shedding Its Skin
Have shell, will travel
Some Dinos Dined on Grass
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Unnatural Disasters
Arctic Algae Show Climate Change
Pollution at the ends of the Earth
Environment
Plant Gas
Food Web Woes
Lessons from a Lonely Tortoise
Finding the Past
A Big Discovery about Little People
A Long Haul
Writing on eggshells
Fish
White Tip Sharks
Eels
Tiger Sharks
Food and Nutrition
Building a Food Pyramid
Chew for Health
Food for Life
GSAT English Rules
Subject and Verb Agreement
Adjectives and Adverbs
Who vs. That vs. Which
GSAT Exam Preparation Jamaica
GSAT Scholarship
Results of GSAT are in schools this week
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Exams Jamaica Scholarships
GSAT Exam Preparation
2014 GSAT Results for Jamaican Kids
GSAT stars reap scholarship glory
GSAT Mathematics
Secrets of an Ancient Computer
Prime Time for Cicadas
Detecting True Art
Human Body
From Stem Cell to Any Cell
Don't Eat That Sandwich!
Flu Patrol
Invertebrates
Caterpillars
Dragonflies
Squid
Mammals
Deers
Gray Whale
Mule
Parents
How children learn
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
Einstein's Skateboard
One ring around them all
The Mirror Universe of Antimatter
Plants
Farms sprout in cities
Stalking Plants by Scent
Nature's Alphabet
Reptiles
Box Turtles
Boa Constrictors
Iguanas
Space and Astronomy
Saturn's Spongy Moon
A Family in Space
A Moon's Icy Spray
Technology and Engineering
Machine Copy
Reach for the Sky
Searching for Alien Life
The Parts of Speech
What is a Verb?
What is a Preposition?
Problems with Prepositions
Transportation
Ready, unplug, drive
Troubles with Hubble
Reach for the Sky
Weather
Watering the Air
Recipe for a Hurricane
Weekend Weather Really Is Different
Add your Article

The Color of Health

Nature is full of color, from rainbows and roses to butterfly wings and peacock tails. Even the fruits and vegetables you eat often have distinctive colors: intensely blue blueberries, deeply red strawberries, richly green broccoli, vividly orange carrots. Plants and animals often use color to attract attention. Deep, rich colors also provide another, important benefit for plants. Scientists have shown that the substances responsible for these colors actually help protect plants from chemical damage. "When we see plants, we see a lot of different colors," says Wayne Askew. "In particular, we see a lot of reds and greens and yellows." Askew is a professor of nutrition at the University of Utah. The good news for us is that, when we eat colorful fruits and vegetables, the pigments (or colorings) protect us, too. Built-in sunscreen The pigments responsible for plant color belong to a class of chemicals known as antioxidants. Plants make antioxidants to protect themselves from the sun's ultraviolet (UV) light. Ultraviolet light causes chemicals called free radicals to form within plant cells. If free radicals move through plant cells without being neutralized or eliminated, they can begin to destroy parts of the plant. Antioxidants stop free radicals in their tracks, shielding cells from harm. Typically, an intensely colored plant has more of these protective chemicals than a paler one does. Free radicals aren't a problem just for plants. They also affect people and animals. And ultraviolet light isn't the only source of these damaging chemicals. If you breathe polluted air, such as smog, automobile exhaust, or discharges from a factory, you take in chemicals that also cause such damage, Askew says. And, the body itself produces free radicals as it processes food. White suit All organisms use oxygen to convert food into energy, just as burning wood in a fireplace produces heat. At the same time, oxygen is involved in the production of free radicals that are often very similar to compounds needed by a cell to stay healthy. Free radicals are like a friendly dog that's just been out in the mud, says James Joseph. He's a nutrition researcher at Tufts University. If you play with the dog while wearing a white suit, the dog will leave muddy paw prints. Unfortunately, the dirt may permanently stain the suit. It's not as if the dog meant to hurt you, Joseph says. After all, it didn't try to bite you. It merely wanted to bond with you. Similarly, free radicals can bond with molecules in a cell, changing the molecules into forms that aren't as useful or good for the cell as the originals were. For example, free radicals can attack lipids—molecules that form a fence around cells to allow only certain chemicals to travel in and out of cells. They can also damage DNA, the genetic material that serves as the master plan for a cell and governs how it works. Proteins, the molecules in a cell that actually do the work of processing food, also face problems if they run into free radicals. In general, free radicals can keep a cell from functioning properly. Sunscreen on the inside Our bodies have natural defenses for fighting off free radicals. The body makes certain molecules, known as antioxidants or repair enzymes, that stop free radicals before they can harm us. It's like a video game of opposing chemical reactions in which good-guy repair enzymes battle bad-guy free radicals for control of cell and body. While we're young, our defenses are pretty strong. However, our natural defenses get weaker as we get older. The body's built-in stoppers can only go so far without extra help. And we can sometimes see the effects of free-radical, or oxidative, damage directly. Wrinkled skin, for example, is one sign of skin-cell damage. Certain cancers and heart disease are linked to free radicals. Overeating and obesity are linked to oxidative damage. We can help by sending in reinforcements: antioxidants. For people, this means a lifestyle of consistently eating a variety of fruits and vegetables with intense colors. Joseph compares eating fruits and vegetables to "putting on sunscreen for the inside of your body." Recently, the U.S. Department of Agriculture released new guidelines that recommended we eat five to nine servings of fruits and vegetables each day. Colorful food The key to fighting free radicals with fruits and vegetables is to mix and match colors. Go for very bright colors and for many different colors. If you're looking for greens, spinach, broccoli, and dark green lettuces do the job. Pale iceberg lettuce packs little chemical bang per bite. For reds, strawberries and other berries are best, and tomatoes are tremendous. Carrots, oranges, sweet potatoes, and squash all shine among the yellow/orange foods. In general, fresh fruits and vegetables are great, but dried or frozen forms of these foods can also be healthy. Blue or purple foods, in particular, can be very beneficial, Joseph says. Have blueberries, Concord grapes, and eggplant, for example, on your menu as often as you can. These blue foods contain hundreds of healthful chemicals not found anywhere else, he says. Joseph's research on how chemicals in blueberries affect brain function in rats even suggests that these chemicals may help our own brains work more efficiently. Wouldn't it be nice to be both healthier and smarter? An antioxidant vitamin? Antioxidants are just chemical compounds. Why can't we just make a good antioxidant pill? People who have tried to make pills with antioxidants in them have found that the pills don't seem to work as well as eating the fruits and vegetables themselves. The different amounts of different antioxidants in the same food appear to work together to fight free radicals more effectively than the ingredients do by themselves, Askew says. Nature has already worked out the right balance in plants. Scientists have a long way to go before they'll really understand how much of each antioxidant chemical works best. So, the next time you're at a supermarket, you can shop for your own personal chemistry experiment. Pick out interesting fruits and vegetables with lots of different colors, then get to work in the kitchen. You might try preparing something that you've never tasted before, or you just might create a meal that's both beautiful to look at and delicious to eat. And, as you digest your meal, those colorful antioxidants will start doing their own chemistry on the inside, neutralizing free radicals and keeping you healthy.

The Color of Health
The Color of Health








Designed and Powered by HBJamaica.com™