Exam 2: Evaluating Nutrition Information

Which of the following statements is true?

Scientists conduct a study in which 100 adults with chronic diarrhea are divided into 2 groups with 50 people per group.One group is given a supply of yogurt that contains a certain kind of bacteria,and the other group is given yogurt that is bacteria-free.The study's participants and researchers do not know which group of subjects has the bacteria in the yogurt and which group does not.The scientists instruct the participants to eat the entire 8 ounces of yogurt once a day for a month and record their bowel habits.This is an example of a(n)________ study.

Scientists study 200 adults who have type 2 diabetes,and 200 adults who have similar characteristics but do not have the disease.For 18 months,the researchers collect lifestyle information on all the study participants.According to the study's findings,the adults with type 2 diabetes were 25% less physically active than their counterparts who did not have type 2 diabetes.This is an example of a(n)________ study.

A nutrition researcher would like to determine whether women who take fish oil supplements during pregnancy give birth to babies who score higher on basic intelligence tests when they are 5 years of age than the 5-year old children that were born to women who did not take the fish oil supplements during pregnancy.This kind of research is a(n)________ study. 

Researchers are conducting a study to determine the effects of vitamin C on the human immune system.The study involves providing pills that contain vitamin C to one group of human subjects,and pills that do not contain vitamin C or other active ingredients to another group of people.The pills that do not contain the vitamin are

Which of the following websites is most likely a source of biased and unreliable nutrition information?

Researchers at a major American university plan a 10-year scientific study to investigate lifestyle factors that contribute to heart disease.Which of the following activities is likely to be a component of their research efforts?

Zack takes 500 mg of vitamin C daily.He advises his friends to take vitamin C supplements because,he claims,the vitamin protects him from cold viruses.His claim about the usefulness of the vitamin is an ________.

Derek takes protein supplements before and after his workouts.He told his workout partner that he became 200% stronger within a couple of months after he added the supplements to his diet.His report about the effects of the supplements is an example of a(n)________.

Which of the following kinds of studies would be the best to use when investigating whether cigarette smoking influences weight gain?  

Which of the following sources of information features peer-reviewed articles?

During an online interview,Dr.Ima Quack provides the following statement,"Most Americans suffer from nutritional-deficiency diseases and will develop cancer within the next 10 years because they are not taking my megavitamin formula therapy." Dr.Quack's statement is an example of a(n)________.

A popular fitness magazine has an article about the health benefits of high-fiber diets.If the article's author has the credentials,________,after his or her name,the article is likely to be a reliable source of nutrition information.

Scientists would like to conduct a study to identify lifestyle factors that are associated with delayed physical growth among a group of low-income American children.Which of the following research designs would be the best for the researchers to use when designing their study?

A group of scientists would like to determine lifestyle factors that are associated with the development of asthma among American children.Based on this information,the researchers should design a(n) _____ study.

A group of scientists conducts a scientific study to investigate dietary factors that influence the development of breast cancer.Which of the following activities is NOT likely to be a component of their research efforts?

Actress Lotta Talent appears in commercials endorsing the herbal supplement Hoodia for weight loss.  Lotta Talent describes her own weight-loss successes with the supplement.Her endorsement is an example of a(n)________.

The physician who studied pellagra in 1914 was

Which of the following statements is true?

Scientists who investigate lifestyle factors that influence the prevalence of obesity among different population groups are conducting a(n)________ study.