The discovery of vitamins in the early 20th century was a huge ____ in the history of nutritional science. People quickly accepted the idea that taking vitamin pills could ____ to a healthy lifestyle. It is now becoming clear, however, that this may not be true. ____, research suggests that not all effects of vitamins are positive. Although they are ____ very good for you, certain vitamins can be harmful in large quantities. Reports about the problems related to vitamins may ____ from one vitamin to another, depending on the ____ of your information. It is now generally agreed however, that people who take large amounts of vitamins A and D should ____ their habits. Too much of these vitamins can cause ____ health problems. Interestingly, the amount of vitamin sales over the past decade has been ____ and may actually be increasing. While the belief in the positive effects of vitamins happened quickly, the understanding that vitamins can be harmful still needs to ____.

Unit 5 Reading 2 Vocabulary

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