Sunday, December 16, 2007

Nutrition tips

Nutrition tips

Everybody knows that you need to eat the right things if you want to stay healthy and fit. But what are the "right things"? What does your body need in order to help you stay active?

One important answer is glucose. Glucose is the fuel your body needs, especially at the beginning of exercise. Even after you've been exercising for a while and your muscles are getting energy from fat, glucose is still important. It's like gasoline for your body - so keep your gas tank full.

Where do you get glucose? You get it from carbohydrates. Maintain a well-balanced diet and choose lots of fruit and vegetables to go with your grains (pasta, rice, bread, cereal). And remember to eat the right things at the right times - food takes time to digest.

Water is another part of eating healthy. You need water to keep the nutrients circulating in your body and to clear out the waste. And you sweat off a lot of water when you exercise (even if you're swimming). You can get your water from milk, juice, sports drinks - or plain old water.

Here's what to eat and drink before, during and after exercise:

More than 3 hours before exercising

  • Eat a regular meal if you want, since you'll have enough time to digest. Balance a serving of lean meat with a good amount of carbohydrates - rice, spaghetti or bread - plus fruit and vegetables and water, milk or juice.
  • Drink regular amounts of fluid - a glass or two every hour.

Just before exercising

  • Stick with light, easy-to-digest snacks. Go for fruits and fruit snacks, perhaps with a few light carbohydrates (graham crackers, cereal, a muffin).
  • Keep yourself well hydrated so you'll have enough water circulating in your system (but not so much that you feel overfull or will have to keep stopping for restroom breaks).

During exercise

  • Drink an average of a cup of liquid every 15 to 20 minutes.
  • Water will be fine for short exercise periods, especially if you've eaten enough in advance. For exercise lasting more than an hour, you may want to keep your energy up with sports drinks or juice mixed with water.

After exercising

  • If you will be exercising again in the next 24 hours, eat some carbohydrate-rich foods within a half hour of your workout.
  • If you will be exercising again in a day or two, make sure to keep lots of carbohydrates in your diet to keep your glucose gas tank full.

See the section in this feature on "Specific foods" for more details on what to eat.

Sun damage: the basics

Image description

The sun emits harmful ultraviolet (UV) radiation, which can result in skin damage ranging from freckling to cancers. There are essentially three types of UV radiation: UVA and UVB, which penetrate the ozone layer, and UVC, which is the most harmful but for now is absorbed by the ozone layer so does not reach the earth's surface. UV radiation causes damage to the epidermis (the outer layer of the skin) through its effects on connective tissue, DNA, and increased production of free radicals. Free radicals are oxygen-containing molecules that are normally produced and cleared by the body, but are damaging in excessive amounts.

UVA radiation is responsible for photoaging, which is skin damage due to excessive sun exposure. Photoaging describes damage such as premature wrinkling, dry rough leathery skin, freckles, and discolorations (solar lentigines, or age spots) on the face, back of hands, arms, chest, and upper back.

Both UVA and UVB radiation contribute to the risk of developing actinic keratosis (a precancerous condition) and skin cancer. Cancers develop due to damaged DNA and, if not detected early, can result in disfigurement and even death.

Tanning and sunburns are two visible signs of sun damage. Many people think that they are not serious and are part of enjoying the season. However, the damage accumulates over time and results in photoaging or skin cancers. It is well known that fair-skinned individuals have less skin pigmentation and are at a higher risk of sun damage. However, even darker-skinned people are not exempt from developing skin cancers and should also protect their skin from the sun's harmful rays.

So the general rule is that everybody needs to use some form of sun protection! It is recommended that you use a broad-spectrum sunscreen - one that protects you from UVA and UVB radiation - and abide by the following guidelines:

  • Avoid the sun between 10 am and 3 pm (11 am and 4 pm daylight saving time).
  • Wear wide-brimmed hats, long-sleeved shirts, and long pants.
  • Consider wearing sun-protective clothing. Unlike sunscreen, this form of sun protection does not wear off. It is highly protective against UV radiation.
  • Use sunscreens that have a sun protection factor (SPF) of at least 15 and that have both UVA and UVB coverage.
  • Apply sunscreen at least 15 to 30 minutes before going out (follow the instructions on the lable). Reapply every 2 to 3 hours - more often if you are swimming or perspiring.
  • Avoid tanning beds.

SPF stands for sun protection factor. The SPF rates a product's ability to protect an average user's skin from sunburn when the product is used properly. When used properly, an SPF 15 sunscreen protects the skin from 93% of UVB radiation; SPF 30 and SPF 45 sunscreens provide more than 96% protection from UVB.

Even though they block the harmful UV rays, sunscreens do wear off, so it is very important to reapply them frequently. Make sure you use the correct amount of sunscreen, too. Adults should use about 35 mL (about one ounce) of sunscreen to cover their entire body. Generally, a 250 mL (about 8 ounce) bottle should last a family of 4 less than a week.

Saturday, December 15, 2007








Is Alcohol Really Good for You?
by Linda Formichelli

Just a glass or two raises your risks for some scary diseases—and lowers them for others. What’s right and wrong with drinking?

When you toast the New Year with a flute of champagne or down a glass of your favorite red wine on the weekends, it can actually be good news for your body: One glass a day (or less) can make your heart stronger and may boost your memory. But have a few too many, and your risks for breast cancer, uterine cancer, and osteoporosis rise fast. So when it comes to drinking, should you or shouldn’t you? Here, experts make sense of the contradictions and help four drinkers (and one abstainer) find the healthiest imbibing strategy.

Can a glass a day keep the doctor—and the pounds—away?

Gabrielle Studenmund, age 31, of Southern Pines, North Carolina, is trying to lose 10 to 20 pounds from her five-foot-five, 155-pound figure. She takes three-mile walks every day and watches calories carefully, but wonders whether giving up the glass of white wine (or sometimes two) that she has every night with dinner would make losing weight easier. At the same time, she doesn’t want to say no if wine is really helping her stave off Alzheimer’s, a heart attack, or some other scary disease.

What the experts say
The wine is probably doing more good than ill. In a study of almost 50,000 women, those who drank moderately (one drink per day) gained less weight than women who abstained—and less than those who had two or more drinks per day. It’s not clear why, but study author Eric Rimm, associate professor of epidemiology and nutrition at Harvard School of Public Health, thinks that alcohol may help burn calories. Plus, alcoholic beverages have no fat and typically have fewer calories than popular non-alcoholic beverages. A 5-ounce glass of red wine has 125 calories, for instance, but a Venti Cappuccino from Starbucks weighs in at 180.

Still, Gabrielle needs to watch what she eats when she’s drinking. Since alcohol often lowers inhibitions, she runs the risk of noshing to excess. To avoid that problem, it’s best to portion out your goodies beforehand and put away leftovers quickly, says Katherine Zeratsky, a registered dietitian for the Mayo Clinic.

Down the road, Gabrielle’s well-behaved taste for wine should pay off in a lower risk for dementia, heart disease, and certain cancers. Alcohol may keep her brain sharp by increasing blood flow upstairs, says David Hanson, founder of AlcoholInformation.org and professor emeritus of sociology at the State University of New York at Potsdam. Moderate drinking also seems to raise HDL (good) cholesterol and lower LDL (bad) cholesterol, while decreasing blood pressure. It may even cut the risk of type 2 diabetes by improving the body’s sensitivity to insulin. How does alcohol pull all that off? Nobody knows for sure, Hanson says, although the calorie burning and improvements in blood chemistry linked to drinking may explain it.

Will drinking too much make me age faster?

Lisa Concepcion Giassa, 36, of Bogota, New Jersey, goes out every other night during the week with the girls for a pitcher of margaritas or sangria, and downs two to three drinks per outing. On the weekends she gets a little more crazy. “For me,” she says, “it’s five drinks and three shots, with water in between.” She prides herself on being the one who can put it away and still have her wits about her. Lisa isn’t oblivious to the immediate dangers—like car accidents or simply falling down—but she’s more worried about premature aging and the risks of a disease like breast cancer or osteoporosis.

What the experts say
Alcohol by itself won’t make Lisa look old before her time. However, Rimm says, “Partyers tend to eat miscellaneous things at the bar (like greasy nachos, cheesy potato skins, and chicken wings) that aren’t great for them,” which can lead to that chunky, middle-aged look. People who drink this way are also more likely than nondrinkers to smoke and to breathe in secondhand smoke in bars, which contributes to wrinkles and higher risks of heart disease and cancer. (Alcohol may also dehydrate you, and that’s never good for the skin.)

But the real problem with binge drinking—or even just two drinks a day for women—is the toll it takes on the inside of your body, not the outside. “If you have more than seven drinks per week, it actually reduces bone mass,” says Janet Greenhut, MD, MPH, senior medical consultant at HealthMedia, which provides online behaviorial help, like alcohol counseling, for health plans and employers. “Also, if someone is in the habit of binge drinking—having four or more drinks in a two-hour period—she’s more prone to falls, and she’s at higher risk for fracture because her bone mass is lower.”

Studies clearly show, too, that more than one drink a day makes you more prone to breast cancer. Researchers at the European Cancer Conference recently reported that the risk rises 10 percent for women who have between one and two drinks a day, compared with women who have less than one, and the risk increases by 30 percent at more than three drinks per day. And don’t think you lower the risk by drinking wine instead of beer or something harder. The same research says any kind of alcohol ups the risk. Uterine-cancer risks go up at two or more drinks per day, as well. What does alcohol have against breasts and uteruses? Experts say it seems to boost estrogen levels, which in some cases cranks up cancer risks.

Does having a drink or two take a toll on my energy?

Eliana Agudelo, 33, of San Francisco loves rock climbing, hiking, and marathons. “It’s part of who I am,” she says. “Being outdoors makes me feel alive, energetic, and connected to the Earth.” She also loves a good microbrew after a day outdoors and a glass of wine a few nights a week. She wants to know if she’d stay in better shape or have more energy if she didn’t drink at all.

What the experts say
A few drinks a week shouldn’t affect Eliana’s performance, says Eric Rimm, a professor at Harvard School of Public Health, whether she’s at the gym, in a road race, or on the trail. However, if alcoholic drinks end up cutting into her water intake during the day, she may get dehydrated. That can leave anyone feeling tired and less eager to work out. One more thing: Eliana should deep-six any drinking right before an athletic event or outing, as it takes four to six hours for the body to break down alcohol. Leave the beer at home, in other words, when you’re rock climbing, and get high on nature when you’re hiking. Otherwise, the risk of a bad fall rises fast.

Could my drinking lead to alcoholism?

The latest numbers from the National Institute on Alcohol Abuse and Alcoholism are discouraging: one in three people will become hooked, to some degree, on alcohol at some point in their lives, and only one-quarter of people with a problem will get treated. Connie Stelter, 41, of St. Paul, Minnesota, has often wondered whether she might need help. She currently has just two drinks a week, but it wasn’t long ago when four or five drinks three times a week was her norm. The heavy drinking happened after she suffered a divorce, two job layoffs, a burglary, and then more relationship turmoil. Now she worries she’ll end up like her brother, an alcoholic. “I know my drinking has really curbed my potential,” she says. Connie wants to know how to tell if she really has a problem, and, if so, what to do next.

What the experts say
Just wondering if you have a problem is a strong hint that you might, says Kevin Wildenhaus, PhD, director of behaviorial science for HealthMedia. (To take a quick test, click on Do I Have a Drinking Problem?). Connie’s family history is another red flag. “People who have a family history of alcoholism have about three times the risk of becoming alcoholics,” Rimm says. “Some say that it could be that you grew up in a setting exposed to alcohol, but even those who grew up apart from their parents have a higher risk.” Most experts classify alcoholism as a disease because of the genetic component and the tendency of some people to become psychologically and physically addicted. They say that Connie shouldn’t blame her brother for a personal failing. That attitude may lead her to blame herself and not seek help if she really does have a problem. Instead, Connie should talk to her doctor or a counselor.

Am I missing out on the benefits of drinking?

Laura Faeth, 44, of Boulder, Colorado, stopped drinking three years ago after experiencing a ton of abdominal pain during a night of partying. “I took it as a sign that my body didn’t want alcohol anymore,” she says. Now she finds socializing just as much fun when she’s sober. But since her father died of pancreatic cancer at age 53 and his mom died of breast cancer at 50, Laura can’t stop wondering whether she could lower her cancer risks by having some red wine every few days.

What the experts say
Women who don’t drink at all do have a slightly higher risk for certain diseases than women who drink just a little. But that’s no reason for Laura to start having wine with dinner in place of, say, water, or to throw down a few at the holiday party while toasting good health. (For tips on avoiding alcohol, click on Sneaky Ways to Just Say ‘No’) “We know so much about how to be healthy already,” Rimm says. “If you’re worried about the risk of diabetes and you’re eating right, for example, adding alcohol won’t do much more for you.”

The same goes for cancer: Ditching cigarettes, eating more fruits and veggies, avoiding too much sun exposure, keeping your weight under control, and getting regular exercise pack a lot more prevention than a bottle of Bordeaux.

Obesity hurts a woman's chances of conception






CHICAGO (Reuters) - Obesity decreases the chances that a woman will get pregnant, and the more obese she is, the worse her prospects of conception, Dutch researchers said on Tuesday. ADVERTISEMENT



Researchers at the Academic Medical Center in Amsterdam looked at how obesity affects women who are still ovulating but having trouble with conception.

The study, published in the journal Human Reproduction, included more than 3,000 couples between 2002 and 2004 in 24 hospitals in the Netherlands.

Dr. Jan Willem van der Steeg and colleagues looked at the relationship between fertility in these women and their body mass index, a ratio of weight to height. Women with a BMI of 30 or higher are considered obese.

The women had to be ovulating and have at least one working Fallopian tube, and the men had to have a normal semen analysis.

The researchers found that women with a BMI of 30 or higher had significantly lower probability of becoming pregnant naturally, compared with normal weight women who had BMIs of between 21 and 29.

"In the case of a woman with a BMI of 35, the probability of spontaneous pregnancy was 26 percent lower, and in the case of a woman with a BMI of 40, it was 43 percent lower," van der Steeg said in a statement.

One reason for this may be the hormone leptin, which regulates appetite and energy expenditure and is secreted in fatty tissues.

"It is possible that obese women may have disturbed hormone levels, which decrease the chances of successful fertilization and implantation," he said.

Obesity is already known to disrupt ovulation, and the Dutch study now suggests it can lower pregnancy rates compared with women of normal weight.

However, the researchers did not track the timing and frequency of sexual intercourse, which may have affected the results. Some studies have shown that obesity is linked with less frequent sex and reduced sexual desire.

The researchers said the finding should be tested in further studies, especially given the rising rates of obesity.

"Owing to the fact that more women of child bearing age are becoming overweight and obese, this is a worrying finding," they wrote.

(Reporting by Julie Steenhuysen; editing by Mohammad Zargham)

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