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  3. In the sporting world today it is no longer professional athletes alone who are looking for ways to enhance their athletic perfo

In the sporting world today it is no longer professional athletes alone who are looking for ways to enhance their athletic perfo

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问题 In the sporting world today it is no longer professional athletes alone who are looking for ways to enhance their athletic performance. Many casual athletes are just as keen as the professionals to increase their competitiveness and to boost their levels of athletic achievement.
   One of the most common ways to perform at a higher level is to fill up on popular fitness foods, such as protein powders, power bars and fitness drinks. Performance foods, as they are often called, have become big business.  As sales continue to increase, so do the expectations of those athletes who use them. Yet despite numerous claims, scientific facts and personal anecdotes, many fitness foods may offer little more than the promise of increased athletic performance.
   One of the most widely known aids used in sports circles, especially among weight lifters, is the protein power drink. Runners and other endurance athletes have adopted it for energy, stamina and extra protein to help promote muscle repair. But after years of study many experts are still unable to confirm if the body needs additional protein, especially since most people’s daily food intake provides twice the required amount of protein.
   At one time, many athletes who competed in endurance sports such as distance running and competitive cycling stuffed themselves with energy bars crammed full of protein, vitamins, fibre and minerals. Many of these power-packed snack bars gained poor marks when it came to nutritional value. Nutritionists noted that as much as 50 per cent of the calories in these bars came from fat content, not the kind most sports people need and certainly not equal to the nutritional value of well-balanced meal.
   In recent years the most widely used sports aid is the glucose drink, a diluted mixture of glucose, sucrose, sodium and potassium. Several studies have shown that these types of products may do some good, especially to the endurance-sports person working out in warm weather and to people who perspire heavily. But for the average athlete who exercise lightly for short periods, the glucose drink is little more than a thirst quencher, as eating habits provide plenty of the fluids, salts.  Proof isn’t conclusive.
   Whatever the future holds for fitness foods, one thing is certain: the hopes and aspirations for them fall short of the desires of potential users. The best enhancement for athletic achievement remains simple high carbohydrate diets, low in fat and packed with nutrient and antioxidant rich grains, fruit and vegetables.
Why are experts unable to make sure if the athletes need more protein?
选项 A、Because they found protein is not always helpful to human body.
B、Because most people’s daily food provides twice the required amount of protein already.
C、Because mutritionsits don’t agree with this idea.
D、Because protein can’t provide enough calories to human body.
答案B
解析
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