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Weight Loss Exercise

Does Conjugated Linoleic Acid Work?

Conjugated linoleic acid is a natural substance found in many of our foods that according to many studies can reduce fat and improve muscle mass in the body. Taken as a supplement with no change in eating or exercise habits, it would not make you lose weight but it could help you lose fat. It is often taken by men looking to lose weight and bodybuild at the same time, but it can also be useful for anyone who is overweight and under-exercising, as any increase in muscle will increase the metabolism, burning more calories.

Conjugated Linoleic Acid

Like many natural weight loss products, conjugated linoleic acid (CLA) combined with a flexible healthy eating plan can lead to gradual long term weight loss and help you get out of the yoyo dieting cycle where you are constantly losing and gaining the same 10, 20 or 50 pounds. Yoyo dieting is very bad for the health. It is better to remain overweight than to keep on losing and gaining, losing and gaining.

CLA SupplementsMost experts (unless they are trying to sell you something) agree that the diet that works best in the long term is the non-diet, where instead of eating special foods and banning others, you eat slightly smaller quantities of a normal healthy diet. If you are currently living entirely on pizza, fries and chocolate, then okay, some changes may be overdue. But you can still have small portions of all of those foods from time to time. If this is the kind of diet that you want, then CLA can help reinforce your plan by boosting your fat loss. Dr Michael Pariza of University of Wisconsin-Madison, reported to the American Chemical Society that CLA “doesn’t make a big fat cell get little. What it rather does is keep a little fat cell from getting big.”

Many studies have been done on CLA. One study published in the Journal of Nutrition found that people taking CLA lost on average six pounds of body fat more than a group that took a placebo. The researchers discovered that you need around 3.4 grams of CLA per day for it to be effective. CLA is found in food, especially meat and dairy products, but supplementation is necessary for most people to reach that level.

Conjugated Linoleic Acid Studies

Another study at Purdue University, Indiana, found that CLA improved insulin levels in about two-thirds of diabetics, and slightly decreased their blood glucose level and triglyceride levels, suggesting that it may help to maintain normal insulin levels. But see your doctor before taking any supplements if you have diabetes.

There are no magic pills for weight loss but if you are willing to commit to reducing your body fat permanently, CLA may help you. Keep in mind that its main effect is to convert fat to muscle, which by itself will not weigh any less. But your body will look slimmer and feel healthier if you do this, and combined with a good weight control eating plan conjugated linoleic acid can help you move toward your ideal weight too.

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Categories
Weight Loss Exercise

Aerobic Fitness declines with age

Ran into this interesting article from Reuters:

Jul 26 (Reuters Health) – Physical fitness is known to wane with age, but a study published Monday shows that the decline gains speed with each decade, regardless of a person’s exercise habits.
The study of 810 healthy adults found that the rate of decline in aerobic fitness was about four times greater among people in their 70s or older, compared with those in their 20s and 30s.

Despite the fact that it boosts aerobic fitness, regular exercise did not change a person’s rate of age-related decline.

However, that does not mean it’s time to retire those running shoes, according to the study authors.

At any given age, people who were at least moderately active were more fit than their sedentary peers, said lead author Dr. Jerome L. Fleg of the National Heart, Lung, and Blood Institute in Bethesda, Maryland.

In addition, he told Reuters Health, research shows that older people can improve their aerobic capacity by getting regular, moderate exercise like walking. The point, according to Fleg, is to help elderly people stay fit enough to perform daily activities — like housework or yard work — and maintain their independence as long as possible.

Fleg and his colleagues at the National Institutes of Health report their findings in Circulation, a medical journal published by the American Heart Association.

The study looked at changes over time in individuals’ VO2max, a measure of aerobic fitness that refers to how much oxygen the body uses during a given activity. The VO2max is the point at which the body can no longer ramp up its oxygen use to keep up with the intensity of the exercise, and the activity rapidly becomes unsustainable.

It’s well known that a person’s VO2max declines with age. But the rate of that decline, Fleg explained, has not been clear-in large part because studies on the subject have typically compared different age groups rather than following the same people over time.

His team’s study included healthy men and women between the ages of 21 and 96 who periodically underwent treadmill tests to gauge their VO2max. The researchers also charted changes in participants’ blood pressure, body composition and lifestyle habits, over an average of eight years of follow-up.

In general, the study found, VO2max declined by 3 to 6 percent per decade while people were in their 20s and 30s. The rate of decline increased with age, going above 20 percent per decade among adults in their 70s or older.

The “good news,” Fleg said, is that active people maintained a higher VO2max than sedentary people their age, pointing to the importance of staying active throughout life.

He noted that older, sedentary adults who want to boost their fitness should consult their doctors before starting to exercise, as should anyone with heart disease.

SOURCE: Circulation, August 2, 2005.
Publish Date: July 26, 2005