Mechanisms underlying comprehension of health information in adulthood: the roles of prior knowledge and working memory capacity

The effects of nutrition knowledge on food label use. A review of the literature

Nutrition information on food labels is an important source of nutrition information but is typically underutilized by consumers. This review examined whether consumer nutrition knowledge is important for communication of nutrition information through labels on packaged foods. A cognitive processing model posits that consumers with prior knowledge are more likely to use label information effectively, that is, focus on salient information, understand information, and make healthful decisions based on this information. Consistent with this model, the review found that nutrition knowledge provides support for food label use. However, nutrition knowledge measures varied widely in terms of the dimensions they included and the extensiveness of the assessment. Relatively few studies investigated knowledge effects on the use of ingredient lists and claims, compared to nutrition facts labels. We also found an overreliance on convenience samples relying on younger adults, limiting our understanding of how knowledge supports food label use in later life. Future research should 1) investigate which dimensions, or forms, of nutrition knowledge are most critical to food label use and dietary decision making and 2) determine whether increases in nutrition knowledge can promote great use of nutrition information on food labels.

Misunderstanding of Front-Of-Package Nutrition Information on US Food Products

Front-of-package nutrition symbols (FOPs) are presumably readily noticeable and require minimal prior nutrition knowledge to use. Although there is evidence to support this notion, few studies have focused on Facts Up Front type symbols which are used in the US. Participants with varying levels of prior knowledge were asked to view two products and decide which was more healthful. FOPs on packages were manipulated so that one product was more healthful, allowing us to assess accuracy. Attention to nutrition information was assessed via eye tracking to determine what if any FOP information was used to make their decisions. Results showed that accuracy was below chance on half of the comparisons despite consulting FOPs. Negative correlations between attention to calories, fat, and sodium and accuracy indicated that consumers over-relied on these nutrients. Although relatively little attention was allocated to fiber and sugar, associations between attention and accuracy were positive. Attention to vitamin D showed no association to accuracy, indicating confusion surrounding what constitutes a meaningful change across products. Greater nutrition knowledge was associated with greater accuracy, even when less attention was paid. Individuals, particularly those with less knowledge, are misled by calorie, sodium, and fat information on FOPs.

Knowledge differentially supports memory for nutrition information in later life

We examined the extent to which prior knowledge about nutrition moderates age differences in remembering newly learned nutrition information. Younger and older adults with varying levels of knowledge read an article on fats and cholesterol and then completed a memory task. Participants responded to statements that were-or were not-presented in the text, which enabled us to examine memory accuracy overall as well as hits and memory errors. Results showed age differences were present in the low-knowledge group but not in the high-knowledge group. Findings illustrate the importance of knowledge for older adults' memory for health information.

Making healthy food choices using nutrition facts panels. The roles of knowledge, motivation, dietary modifications goals, and age

Nutrition facts panels (NFPs) contain a rich assortment of nutrition information and are available on most food packages. The importance of this information is potentially even greater among older adults due to their increased risk for diet-related diseases, as well as those with goals for dietary modifications that may impact food choice. Despite past work suggesting that knowledge and motivation impact attitudes surrounding and self-reported use of NFPs, we know little about how (i.e., strategies used) and how well (i.e., level of accuracy) younger and older individuals process NFP information when evaluating healthful qualities of foods. We manipulated the content of NFPs and, using eye tracking methodology, examined strategies associated with deciding which of two NFPs, presented side-by-side, was healthier. We examined associations among strategy use and accuracy as well as age, dietary modification status, knowledge, and motivation. Results showed that, across age groups, those with dietary modification goals made relatively more comparisons between NFPs with increasing knowledge and motivation; but that strategy effectiveness (relationship to accuracy) depended on age and motivation. Results also showed that knowledge and motivation may protect against declines in accuracy in later life and that, across age and dietary modification status, knowledge mediates the relationship between motivation and decision accuracy.

Online health information seeking: the influence of age, information trustworthiness, and search challenges

OBJECTIVE

The Internet holds great potential to support information gathering and decision making surrounding health education and self-care. Older adults, however, underutilize the Internet for health information searches relative to younger adults. The goal of the present study was to examine age differences in the role of trust and ease of search in predicting whether or not individuals use (adopters) or do notuse (nonadopters) the Internet to search for health information.

METHOD

We used logistic regressions todetermine whether there were age differences in the extent to which trust and ease of search predicted online health information searches within a nationally-representative sample of 3796 adults from the Health Information National Trends Survey (HINTS).

RESULTS

Adopters were more trusting of Internet health informationthan nonadopters. However, a significant age by trust interaction indicated that this difference increased in magnitude with age, a pattern that held even after controlling for demographic and health variables.

CONCLUSIONS

Older adults may benefit from special instructions designed to boost Internet trust, for example, learning how to distinguish between high and low quality health-related websites.