Wanttogetthin?Eatmorefruitandvegetables—they'realowcal...

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Want to get thin? Eat more fruit and vegetables — they're a lowcalorie (熱量) way of filling up, right? It depends which ones you eat. Eating starchy (含澱粉的) vegetables such as corn and potatoes was linked to weight gain. Eating more highfibre, lowerglycemic (低血糖的) vegetables was associated with weight loss. Lowerglycemic foods do not raise blood sugar levels as much as higher ones.

The study from Harvard University looked at changes in the intake of specific fruit and vegetables recorded from 133,468 US men and women over 24 years. It took into account other lifestyle factors that affect weight, such as smoking, amount of sleep, hours of watching television and exercise. Dr Monica L Bertoia, the lead author, says that, in America, the most common choices of fruit and vegetables are orange juice and potatoes. “There are many fruits and vegetables that may be better choices for the prevention of weight gain, such as apples, pears, berries and nonstarchy vegetables，” she says.

The idea of eating more fruit and vegetables to lose weight only works if you eat less of something else — all calories count. A study last year looking at previous research on weight loss and increased fruit and vegetable intake in more than 1,200 people, found that people who didn't reduce their calorie intake overall did not lose weight.

Different fruit and vegetables have different qualities. So if you want highfibre, lowglycemic fruit, go for blueberries and avocados (油梨). Strawberries are low on fibre but good on the lowglycemic index (指數), as is grapefruit — unless you pour sugar on it. Pears and apples come out well, even though they have a highglycemic index — their higher fibre, which is good for weight loss, may compensate. For vegetables, try tofu, cauliflower and sweet potatoes or yams (山*) rather than potatoes. But remember, they all still have calories.

28．In losing weight, what does Bertoia think of Americans' choice of fruit?

A．She is all for it.

B．She thinks highly of it.

C．She thinks nothing of it.

D．She partly accept it.

29．According to the text, what is the best way to lose weight?

A．Taking in fewer calories.

B．Eating more fruit and vegetables.

C．Stopping smoking and watching TV.

D．Choosing one special fruit or vegetable.

30．The underlined word “compensate” in the last paragraph can be replaced by “________”．

A．do harm B．go down