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January 3, 2007 | Issue 97 | ||
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Low in Calories, High in Nutrients
Echoing numerous animal studies published in years past, new research on humans is finding that eating a diet full of low-calorie, nutrient-rich foods like fruits, vegetables, and whole grains appears to slow the aging process.
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Body Temperatures, Insulin
The latest study, from Louisiana State University, compared healthy overweight people following a typically calorie-rich American diet with healthy, overweight people on a 900-calorie-a-day diet.
After six months, the low-calorie eaters not only lost a lot of weight but also had significantly lower insulin levels and body temperatures compared to the high-calorie eaters.* Both animal and human studies have shown that those with lower body temperatures tend to live longer, as do those with lower fasting insulin levels, wrote lead author Dr. Eric Ravussin and team.
What’s more, less DNA damage was occurring in the low-calorie dieters, which is very important information, pointed out the authors, because one of the many theories of aging is that there is more DNA damaging happening. Smokers, for example, have more DNA damage.
1,800 Vs. 2,700 Calories
In related new research, scientists from Washington University in St. Louis compared 28 adults who had been following a low-calorie (about 1,800 calories daily), nutritionally-packed diet for the last 3 to 15 years with 28 adults eating a typical high-calorie Western diet (about 2,700 calories daily).**
For both groups, the scientists measured several biochemical indicators linked with aging and longevity, including a thyroid hormone called T3, involved in the control of body temperature and cell metabolism. Low levels of T3, lead investigator Dr. Luigi Fontana and team explained, may slow down aging. They observed reduced concentrations of T3 only in the low-calorie dieters.
In the low-calorie group, levels of two other thyroid hormones – T4 and TSH – were normal, indicating that this 1,800-calorie-a-day group was not afflicted with a thyroid disease called hypothyroidism.
An earlier study by Dr. Fontana and colleagues also affirmed the anti-aging, disease-fighting power of low-calorie, nutrient-dense diets for humans. The scientists compared 18 people who for several years had been following diets ranging from 1,100 to 1,950 calories daily with 18 other people who ate 1,975 to 3,550 calories per day.***
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Pritikin Perspective - Healthy Living Made Easier
Pritikin Perspective is a publication for Alumni of the Pritikin Longevity Center. It is dedicated to helping people make healthy changes in their lives. The articles in this publication should not be considered specific medical advice, as each individual circumstance is different. You are strongly encouraged to seek medical advice before beginning a program of diet and exercise.
Editor/Writer: Eugenia Killoran.
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