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Table 4 Central ideas and corresponding proportion (%) of total key expressions for Group B in response to content questions about the reading assignment

From: Does knowledge of evolutionary biology change high school students’ attitudes about healthy eating?

Familiar content areas
 1. Overweight/obesity is a serious problem75.0%
 2. Carbohydrates come in different forms16.7%
 3. People have a taste preference for sweets8.3%
Unfamiliar or new content areas
 1. The extent of the overweight/obesity problem35.3%
 2. Some foods can raise blood sugar levels quickly23.5%
 3. The glycemic index as a metric17.6%
 4. Blood sugar levels need to be regulated17.6%
 5. The context of human evolution5.9%