Weakening Argument of Whole Grains Effect on Cholesterol

Medium Weaken Undermine Argument

A prominent health magazine claimed that eating a diet rich in whole grains leads to lower cholesterol levels in adults. They based this conclusion on a survey of 1,000 adults who reported their eating habits and cholesterol readings. However, they did not consider other factors such as age, exercise habits, or family medical history, which could also affect cholesterol levels.

Which of the following, if true, would most seriously weaken the magazine's conclusion?

Many adults in the survey had high levels of physical activity, which is known to lower cholesterol.

Whole grains are often included in many popular diets that also emphasize other healthy food choices.

The survey found that a number of respondents had undergone recent medical treatments affecting cholesterol.

A significant portion of the adults surveyed had a family history of high cholesterol.

Participants in the survey reported generally lower levels of stress than the average adult.

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