Eat less, live longer? 禁食或齋戒健康嗎?

更新時間 2012年 8月 13日, 星期一 - 格林尼治標準時間15:18

Vocabulary: Eating and dieting 飲食和減肥

A girl looks at food

Can you resist the temptation of food?

If you love eating and have a gargantuan appetite, the idea of going on a diet might be hard to swallow.

Yet evidence suggests that short periods of fasting could help people lose weight and lead to better health. A lower calorie intake increases the life expectancy of mice, so could the same be true for humans?

Studies show that high levels of a growth hormone called IGF-1 can lead to accelerated ageing, whilst a low level can help prevent age-related diseases. Now evidence suggests the level of IGF-1 in our bodies can be lowered by what we eat.

It's not only about eating less, but also about limiting the amount of protein we ingest. Research by Professor Valter Longo of the University of Southern California suggests that when the level of IGF-1 drops, our bodies switch from "growth mode" to "repair mode".

BBC journalist Michael Mosley went on the 5:2 diet, which involves eating normally for five days a week, then only consuming 600 calories for two days. Despite this reduced calorie intake two days a week, he didn」t crave more food on other days: "On my feed days I ate what I normally do and felt no need to gorge." However, he adds that "Current medical opinion is that the benefits of fasting are unproven and until there are more human studies it's better to eat at least 2000 calories a day. Fasting, like eating, is best done in moderation."

For those who want to reduce their weight whilst maintaining a varied diet, fasting for short periods of time might be healthier than crash diets or yo-yo dieting. However, others might decide they have enough on their plate without having to think constantly about what they eat. Either way, information about fasting provides food for thought.

Quiz 測驗

1. What happens to mice when they consume fewer calories?

Mice that consume fewer calories live longer.

2. Why is it better to have a low level of the growth hormone IGF-1?

A high level of IGF-1 can make us age more quickly, whereas a low level of IGF-1 can be protective and help prevent age-related diseases.

3. Which verb in the article means "to really want to eat something"?

To crave. It can also be used as a noun: if you have "a craving" for chocolate, it means you really want to eat chocolate.

4. Why should we be careful when fasting?

We should be careful because the benefits of fasting are unproven.

5. What is the name of a diet that makes someone's weight go up and down?

Yo-yo dieting. This is what we call diets that don't lead to long-term weight loss, so a person's weight fluctuates.

Glossary 词汇表 (点击单词收听发音)

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