Infant and Toddler Consumption of Sweetened and Unsweetened Lipid Nutrient Supplements After 2-Week Home Repeated Exposures

Does sweetness exposure drive 'sweet tooth'?

It is widely believed that exposure to sweetened foods and beverages stimulates the liking and desire for sweetness. Here we provide an updated review of the empirical evidence from human research examining whether exposure to sweet foods or beverages influences subsequent general liking for sweetness (‘sweet tooth’), based on the conclusions of existing systematic reviews and more recent research identified from a structured search of literature. Prior reviews have concluded that the evidence for a relationship between sweet taste exposure and measures of sweet taste liking is equivocal, and more recent primary research generally does not support the view that exposure drives increased liking for sweetness, in adults or children. In intervention trials using a range of designs, acute exposure to sweetness usually has the opposite effect (reducing subsequent liking and desire for sweet taste), while sustained exposures have no significant effects or inconsistent effects. Recent longitudinal observational studies in infants and children also report no significant associations between exposures to sweet foods and beverages with measures of sweet taste preferences. Overall, while it is widely assumed that exposure to sweetness stimulates a greater liking and desire for sweetness, this is not borne out by the balance of empirical evidence. While new research may provide a more robust evidence base, there are also a number of methodological, biological and behavioural considerations that may underpin the apparent absence of a positive relationship between sweetness exposure and liking.

Conceptual Considerations and Methodological Challenges to Measuring Food Acceptance During Infancy

PURPOSE OF REVIEW

The purpose of this review is to (1) present a conceptual definition of infant food acceptance, (2) explore methodological challenges to measuring different components of food acceptance, and (3) provide recommendations for future research on food acceptance during infancy.

RECENT FINDINGS

Infant food acceptance includes separate but overlapping components: wanting, liking, and consumption. Recent evidence suggests that although these components are often correlated, there is variability in the sensitivity of these measures to detect differences in infants' responses to target foods. To date, consumption and caregiver perceptions of liking have been the primary outcome measures of interest in studies of infant food acceptance. More diverse and precise measures across the three components of infant food acceptance are needed to address a wider scope of research questions, which would in turn strengthen the interpretability and translational potential of research in this area.

Acceptance of a Novel Food is Related to Caregiver Perceptions of Infant and Toddler Food-related Receptive Language

OBJECTIVE

Language development, both what is understood (receptive language) and spoken (expressive language), is considered critical to a child's ability to understand and interact with their environment. However, little research has investigated the role children's early language skills might play in their food acceptance. The objective of this study was to explore the relationships between young children's food-related receptive language (FRL) and food-related expressive language (FEL) and acceptance of novel food.

METHODS

Caregivers (n = 54) reported their perceptions of children's (aged 7-24 months) FRL and FEL using the MacArthur-Bates Communicative Development Inventory. Novel food acceptance was observed (grams consumed) during a laboratory visit. Multivariable linear regression tested associations between FRL, FEL, and novel food acceptance, by child age (infants [aged from 7 to < 12 months], toddlers [aged 12-24 months]), and at a significance level of P < 0.1 for hypothesis-generating research.

RESULTS

Children's FRL and food acceptance differed by age (F = 8.08, P = 0.01). Among toddlers, greater FRL was associated with greater novel food acceptance (0.22 g [95% confidence interval, -0.04 to 0.49]), P = 0.09). In infants, greater FRL was associated with lower novel food acceptance (-0.80 g [95% confidence interval, -1.53 to -0.07], P = 0.03). No association between FEL and novel food acceptance was noted in either group.

CONCLUSIONS AND IMPLICATIONS

Toddlers' understanding of food-related vocabulary may facilitate food acceptance; however, young infants may not yet have sufficient FRL to facilitate novel food acceptance.

Development of a live coding method to assess infant/toddler food acceptance

Validated measures predicting infant consumption of nutrient supplements or fortified foods are essential for the success of nutritional interventions to improve undernutrition. Behavioural coding of food acceptance is one promising approach, though the required time and resources are limiting. The overarching goal of the present study was to adapt a video coding (VC) protocol for use as a live coding (LC) method to assess infant food acceptance in naturalistic settings. Infants (n = 59; ages 7–24 months) were fed a small‐quantity lipid‐based nutrient supplement (SQ‐LNS) mixed with a familiar food by caregivers in the State of Morelos, Mexico. Trained coders used a VC scheme to rate infant acceptance of each spoon offer using a 4‐point scale. The VC scheme was subsequently adapted for use as an LC method to be used in participant homes and a video live coding (VLC) method to monitor reliability. Reliability and validity of the LC method were tested in a subsample of dyads (n = 20). Intraclass correlation coefficients (ICCs) indicated that the inter‐rater reliability between coders using the LC method was moderate or good when compared to VC methods (ICCs = 0.75 and 0.87). Live coded acceptance scores were also moderately associated with consumption of the SQ‐LNS (ρ = 0.50, p = 0.03). The LC scheme demonstrated initial reliability and validity as an assessment of infant food acceptance. Since VC is both resource and time‐intensive, the LC scheme may be useful for assessing infant food acceptance in resource‐limited settings.

Current measures to assess infant food acceptance in nutritional interventions are limited.

This study presents a live coding scheme and protocol that can be used to objectively rate infants’ food acceptance in naturalistic settings.

The coding method demonstrated initial reliability with video coding methods and was associated with infants’ consumption of a target food.

The live coding protocol may be particularly useful for assessing infant food acceptance in resource‐limited settings.