Infant and Toddler Responses to Bitter-Tasting Novel Vegetables: Findings from the Good Tastes Study

I'll Never Give Up: A Qualitative Study of Caregivers' Perceptions and Decisional Processes When Feeding Infants and Toddlers Novel and Disliked Foods

OBJECTIVE

To better understand caregivers' decisional processes related to offering novel and disliked foods to their infants and toddlers.

DESIGN

As part of a parent study on young children's food acceptance that took place in Denver, CO, this secondary analysis used a basic qualitative approach to explore caregivers' decisional processes related to repeated exposure and children's food rejection.

PARTICIPANTS

English-speaking caregivers of infants and toddlers (aged 6-24 months; n = 106) were recruited via flyers and social media and interviewed (from July, 2017 to January, 2018) during a laboratory visit focused on introducing a novel food.

PHENOMENON OF INTEREST

Factors influencing caregiver decisions to (dis)continue offering novel or disliked foods.

ANALYSIS

Using a combined deductive and inductive coding approach, trained researchers coded transcripts and codes, which were reviewed and discussed by all investigators to identify themes.

RESULTS

Three major themes (and 2 subthemes) were generated regarding caregivers' decisions about re-offering rejected foods: 1) Caregivers understand that multiple experiences with new foods are needed because children's reactions can be unpredictable and depend upon time, developmental stage, and child traits; 2) Caregivers vary in their persistence and decisions to keep offering foods depending on responsiveness to child cues (sub-theme) and adult-centered beliefs, needs, and decisions (sub-theme); 3) Child food acceptance will change with time, circumstances, and development if you keep trying.

CONCLUSIONS AND IMPLICATIONS

Although caregivers are aware of repeated exposure, additional implementation research focused on translating theory into effective home practices could assist caregivers to persist in offering novel or disliked foods.

Taste assessment for paediatric drug Development: A comparison of bitterness taste aversion in children versus Naïve and expert young adult assessors

Medicines for children often taste bitter, presenting a significant challenge to treatment compliance. However, most studies on paediatric drug development rely on adult volunteers for sensory research, and the level of expertise required from these assessors is unclear. This study aimed to address this gap by investigating perceived bitterness aversion to taste strips impregnated with different concentrations of quinine hydrochloride in 439 school-aged children. Expert (n = 26) and naïve (n = 65) young adult assessors evaluated quinine solutions as well as taste strips, for methodological bridging purposes. All assessors differentiated the aversiveness of the taste strips in a dose dependent manner. Younger children aged 4-8 years had difficulty discriminating higher bitter concentrations, whereas pre-adolescents 9-11 years and naive adults showed better discrimination at the top of the scale. Naive assessors showed similar bitter perception as children. However, the results were slightly different between strips and solution in adults. These findings highlight the key role that adult panels can play in paediatric formulation development. Taste strips show promise as a safe and pragmatic tool for sensory pharmaceutical evaluations, though further studies are warranted to establish the relationship between age and hedonic taste perception using compounds with diverse physicochemical and sensory qualities.

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.

"The Kale Is Green" and Other Things Caregivers Say when Feeding Infants and Toddlers Are Associated with Child Rate of Acceptance

BACKGROUND

Responsive feeding is important for helping children to develop healthy eating behaviors. Verbal feeding interactions between caregivers and children may reflect caregiver's responsiveness and contribute to children's developing lexical networks related to food and eating.

OBJECTIVES

This project aimed to: 1) characterize what caregivers say to infants and toddlers during a single feeding session and 2) test the associations between caregiver's verbal prompts and food acceptance by children.

METHODS

Filmed interactions of caregivers and their infants (N = 46 infants aged 6-11 mo) and toddlers (N = 60 toddlers aged 12-24 mo) were coded and analyzed to explore the following: 1) what caregivers said during a single feeding session and 2) whether caregiver's verbalizations were associated with child food acceptance. Caregiver verbal prompts were coded during each food offer and summed across the feeding session; prompts were categorized as supportive, engaging, and unsupportive. Outcomes included accepted tastes, rejected tastes, and rate of acceptance. Mann-Whitney's U tests and Spearman's correlations tested bivariate associations. Multilevel ordered logistic regression tested associations between verbal prompt categories and the rate of acceptance across offers.

RESULTS

Verbal prompts were largely supportive (41%) and engaging (46%), and caregivers of toddlers used significantly more verbal prompts than caregivers of infants (mean ± SD: 34.5 ± 16.9 compared with 25.2 ± 11.6; P = 0.006). Among toddlers, more engaging and unsupportive prompts were associated with a lower rate of acceptance (ρ = -0.30, P = 0.02; ρ = -0.37, P = 0.004). For all children, multilevel analyses revealed that more unsupportive verbal prompts were associated with a lower rate of acceptance (b = -1.52; SE = 0.62; P = 0.01) and individual caregiver use of more engaging and unsupportive prompts than usual was associated with a lower rate of acceptance (b = -0.33; SE = 0.08; P < 0.001: b = -0.58; SE = 0.11; P < 0.001).

CONCLUSIONS

These findings suggest that caregivers may strive for a supportive and engaging emotional setting during feeding, although verbalization category may change as children exhibit more rejection. Furthermore, what caregivers say may change as children develop more advanced language capabilities.

Flavor Sensing in Utero and Emerging Discriminative Behaviors in the Human Fetus

The diet of pregnant women exposes fetuses to a variety of flavors consisting of compound sensations involving smell, taste, and chemesthesis. The effects of such prenatal flavor exposure on chemosensory development have so far been measured only postnatally in human infants. Here, we report the first direct evidence of human fetal responsiveness to flavors transferred via maternal consumption of a single-dose capsule by measuring frame-by-frame fetal facial movements. Pregnant women and their fetuses based in the northeast of England were involved in this study from 32 to 36 weeks' gestation. Fetuses exposed to carrot flavor (n = 35) showed "lip-corner puller" and "laughter-face gestalt" more frequently, whereas fetuses exposed to kale flavor (n = 34) showed more "upper-lip raiser," "lower-lip depressor," "lip stretch," "lip presser," and "cry-face gestalt" in comparison with the carrot group and a control group not exposed to any flavors (n = 30). The complexity of facial gestalts increased from 32 to 36 weeks in the kale condition, but not in the carrot condition. Findings of this study have important implications for understanding the earliest evidence for fetal abilities to sense and discriminate different flavors.

From food preference development to responsive feeding - Selective studies to commemorate the life and work of Dr Leann Birch

Dr Leann Birch was a pioneer in conducting research on infant and child eating behaviour. At the beginning of her research career, Leann recognised a significant gap in the developmental psychology literature, namely that few studies had been conducted to understand infant eating and feeding behaviours. This seems an unusual omission given that food intake is essential and that developmental milestones from milk to solids, and from being fed to becoming an autonomous eater, are obvious to most caregivers. Leann paved the way for interdisciplinary research from psychology, paediatrics and public health to explore and apply this knowledge to infant and child appetite, eating behaviour, dietary patterns, food preferences, and obesity risk. Early studies in her laboratory demonstrated that children form food preferences through experience and socialisation. Experiments published in 1979 tested the role of familiarisation through repeat exposure, and the impact of instrumental and social learning on the acquisition of food preferences. In 1984, a presentation given to the British Feeding and Drinking Group (BFDG) in Brighton set out three organising principles for understanding how children acquire food preferences: genetically pre-programmed behavioural propensities; social constraints on experience with food; and social transmission resulting from direct social interaction. Building on these three organising principles, research on child eating behaviour has flourished, including the intersection between individual differences, food experience and environmental influences on children's food preferences, energy regulation, and weight outcomes. In this review, the initial groundwork set out by Leann Birch on food preference development in children is considered followed by a discussion of how this has since inspired an interdisciplinary, international and expanding field of research on children's food intake, appetite and body weight regulation.

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.

Application of a salt substitute in bitter taste suppression and toward better acceptance of cruciferous vegetables in diet

The addition of table salt has been reported to enable better acceptance when consuming the least preferred vegetables belonging to the Cruciferae family. Considering the adverse effect of excessive table salt intake on incidence of hypertension and cardiovascular diseases, it is essential to explore an alternative healthier option for better acceptance and to encourage consumption of these vegetables. In this study, 261 adult participants were evaluated for their preferences toward basic tastes and food as well as sensory evaluation of a meal prepared from cruciferous vegetables with the addition of two different salts, sodium chloride and salt substitute containing a blend of potassium and sodium salts. A general questionnaire was used to assess taste and food preferences, while the Cruciferous Vegetable Food Frequency Questionnaire (CVFFQ) was used for vegetable intake assessment. The Labeled Magnitude Scale (LMS), Just About Right (JAR) scale, and several hedonic scales were used to determine taster status and sensory evaluation. The results show that a low concentration of the salt substitute did not impact bitterness suppression but did result in higher preference of the cruciferous vegetable meal. Although, subjects self-reported to have salty taste preferences were more sensitive to bitter taste, they did not perceive samples as less salty and less acceptable than subjects with lower sensitivity. The results show the necessity for further examination of the effectiveness of different concentrations of the assessed salt substitute in suppressing perceived bitterness of cruciferous vegetables and regarding their overall acceptance for inclusion in diets.