Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.

Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the (26)_______ of overweight people is at a new high. People often try some of the popular fad diets. Many people see fad diets as harmless ways of losing weight, and they are grateful to have them.Unfortunately, not only don't fad diets usually (27)______ the trick, they can actually be dangerous for your health.

Experts estimate that 95 percent of dieters return to their starting weight, or even gain weight. While the reckless use of fad diets can bring some (28)______ result, long-term results are very rare. (29)______ , people who are fed up with the difficulties of changing their eating habits often turn to fad diets which involve extreme dietary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation (30)_______ a person's body doesn't get all the vitamins and other things that it needs to stay healthy.