英文阅读：嗜甜者易衰老？
你喜欢吃糖吗?新的研究表明，过多的摄入糖，会加速人的衰老进程。那么吃多了糖，人真的会更快变老吗?Rats that eat high levels of a natural sugar known as fructose(果糖) seem to
age faster than other rats--and the same could be true for people who eat too
much sweet junk food, Israeli researchers said Monday.
Fructose, found naturally in honey and fruit, is used widely in foods
ranging from soft drinks to yogurt. But while its sweet taste is popular, the
sugar could cause wrinkles and heal the problems, the researchers said. Dr.
Moshe Werman and Boaz Levi of the Technion-Israel Institute of Technology fed
large amounts of fructose to laboratory rats. Writing in the Journal of
Nutrition, they said the fructose-fed rats showed changes n the collagen of
their skin and bones.
Collagen, a fibrous protein found in connective tissue, bone and cartilage,
basically holds the body together. The loss of collagen is what causes sagging
and deep wrinkles in older people.
The process affected, Werman's team said, is known as "cross linking". "Too
much cross-linking reduces elasticity and makes the skin stiff and rigid, and
these are the conditions that encourage wrinkled skin," Werman said in a
statement. He said the same could be true of people, although this has not been
shown. "Americans are eating more and more processed foods such as carbonated
drinks, baked goods, canned fruits, jams and dairy products that contain
fructose," Werman said. Other studies have shown that high fructose intake can
affect how the body handles glucose and increases insulin resistance---- which
can both be important measures of the tendency toward diabetes.
The rats Werman worked with were fed much more than the average adult
person might eat in a day, which is standard in such experiments. The rats were
fed 12.5 grams of fructose per kg (2.2 pounds) of weight every day for a year.
To compare, a person weighing 154 pounds (70kg) who drinks a quart (liter) of
cola consumes about 60 grams of fructose, or 0.8 grams per kg of body
weight.
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