Abstract
Background
Food reward and cue reactivity have been linked prospectively to problematic eating behaviours and excess weight gain in adults and children. However, evidence to date in support of an association between degree of adiposity and food reward is tenuous. A non-linear relationship between reward sensitivity and obesity degree has been previously proposed, suggesting a peak is reached in mild obesity and decreases in more severe obesity in a quadratic fashion.
Objective
To investigate and characterise in detail the relationship between obesity severity, body composition, and explicit and implicit food reward in adolescents with obesity.
Methods
Data from seven clinical trials in adolescents with obesity were aggregated and analysed in an independent participant data meta-analysis. Linear and curvilinear relationships between the degree of obesity and explicit and implicit reward for sweet and high fat foods were tested in fasted and fed states with BMI-z score as a continuous and discrete predictor using clinically recognised partitions.
Results
Although positive associations between obesity severity and preference for high-fat (i.e. energy dense) foods were observed when fasted, none reached significance in either analysis. Conversely, adiposity was reliably associated with lower reward for sweet, particularly when measured as implicit wanting (p = 0.012, ηp2 = 0.06), independent of metabolic state. However, this significant association was only observed in the linear model. Fat distribution was consistently associated with explicit and implicit preference for high-fat foods.
Conclusions
A limited relationship was demonstrated between obesity severity and food reward in adolescents, although a lower preference for sweet could be a signal of severe obesity in a linear trend. Obesity is likely a heterogenous condition associated with multiple potential phenotypes, which metrics of body composition may help define.
Clinical trial registrations
NCT02925572: https://classic.clinicaltrials.gov/ct2/show/NCT02925572. NCT03807609: https://classic.clinicaltrials.gov/ct2/show/NCT03807609. NCT03742622: https://classic.clinicaltrials.gov/ct2/show/NCT03742622. NCT03967782: https://classic.clinicaltrials.gov/ct2/show/NCT03967782. NCT03968458: https://classic.clinicaltrials.gov/ct2/show/NCT03968458. NCT04739189: https://classic.clinicaltrials.gov/ct2/show/NCT04739189. NCT05365685: https://www.clinicaltrials.gov/study/NCT05365685?tab=history.
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Data availability
Relevant data described in the manuscript will be made available upon reasonable request pending approval from relevant stakeholders.
Notes
Note that dopaminergic tone and binding potential are inversely related.
For sensitivity analyses involving models with BMI-z as a categorical predictor, see section S1 of the supplementary materials.
Abbreviations
- BMI:
-
Body mass index
- CDC:
-
Centers for disease control and prevention
- DXA:
-
Dual-energy X-ray absorptiometry
- FM:
-
Fat mass
- FFM:
-
Fat-free mass
- LFPQ:
-
Leeds food preference questionnaire
- VAS:
-
Visual analogue scale
- IDP:
-
Individual participant data
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HM and DT designed the analysis; DT, AF, MM, and JM conducted the research; DT provided essential reagents, or provided essential materials; HM and BP analysed the data; HM wrote the paper; GF and KB reviewed the paper and provided essential feedback; HM had primary responsibility for the final content. All authors have read and approved the final manuscript.
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The primary clinical trials that produced the data for the present study received ethics approval by independent university review board and were conducted in accordance with the principles laid out by the 1964 Declaration of Helsinki and its later amendments. All parents or guardians provided their informed consent prior to their children being included in each study.
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Moore, H., Pereira, B., Fillon, A. et al. The association between obesity severity and food reward in adolescents with obesity: a one-stage individual participant data meta-analysis. Eur J Nutr (2024). https://doi.org/10.1007/s00394-024-03348-4
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DOI: https://doi.org/10.1007/s00394-024-03348-4