Does acculturation affect the dietary intakes and body weight status of children of immigrants in the U.S. and other developed countries? A systematic review

Objective: This paper reviews available studies on the relationship between acculturation and obesity among children of immigrants who have at least one foreign-born parent.

Methods: A systematic review of relevant studies was undertaken using PubMed, Web of Science, and PsychInfo.

Results: The initial search identified 1317 potentially relevant publications, of which 21 were retained after three rounds of screening. Most studies were conducted in the U.S. The majority of studies used BMI or overweight/obesity prevalence as the outcome variable, while two studies used dietary intake. Three studies used standardized acculturation scales, while most of the studies used generation, duration of residency in host country, and language as proxy measures of acculturation. The relationship between acculturation and outcomes varied between the host countries and origin countries for children of immigrants.

Conclusion: This study suggests children of immigrants with different cultural backgrounds may interact with host countries to varying degrees, ultimately influencing their diet behaviours and body weight status. Researchers are encouraged to adopt standardized acculturation scales to compare the results across countries and populations.     

Childhood violence exposure and social deprivation are linked to adolescent threat and reward neural function

BackgroundChildhood adversity is, unfortunately, highly prevalent and strongly associated with later psychopathology. Recent theories posit that two dimensions of early adversity, threat and deprivation, have distinct effects on brain development. The current study evaluated whether violence exposure (threat) and social deprivation (deprivation) were associated with adolescent amygdala and ventral striatum activation, respectively, in a prospective, well-sampled, longitudinal cohort using a pre-registered, open science approach.MethodsOne hundred and sixty-seven adolescents from the Fragile Families and Child Wellbeing Study completed functional magnetic resonance imaging (fMRI) scanning. Prospective longitudinal data from ages 3, 5 and 9 years were used to create indices of childhood violence exposure and social deprivation. We evaluated whether these dimensions were associated with adolescent brain function in response to threatening and rewarding faces.ResultsChildhood violence exposure was associated with decreased amygdala habituation (i.e. more sustained activation) and activation to angry faces in adolescence, whereas childhood social deprivation was associated with decreased ventral striatum activation to happy faces in adolescence. These associations held when adjusting for the other dimension of adversity (e.g., adjusting for social deprivation when examining associations with violence exposure), the interaction of the two dimensions of adversity, gender, internalizing psychopathology, and current life stress.ConclusionsConsistent with recent theories, different forms of early adversity were associated with region-specific differences in brain activation.