Sexual Dimorphism of Brown Adipose Tissue Function

Area of Science:

• Pediatric Endocrinology
• Metabolic Health
• Thermogenesis Research

Background:

• Brown adipose tissue (BAT) plays a crucial role in energy expenditure and thermogenesis.
• Understanding factors influencing BAT activity in children is vital for addressing childhood obesity.
• Previous research has not fully elucidated sex-based differences in pediatric BAT activity or the impact of diet and lifestyle.

Purpose of the Study:

• To investigate sex differences in brown adipose tissue (BAT) activity in school-aged children.
• To explore the influence of dietary intake, sedentary behavior, and picky eating on BAT activity.
• To examine the relationship between BAT thermogenesis and body mass index (BMI) percentile.

Main Methods:

• Infrared thermography was used to measure skin temperature over the supraclavicular BAT depot in 36 children (aged 8.5-11.8 years) before and after cold exposure.
• Parental reports on food consumption, eating behaviors (picky/fussy eating), and physical activity levels were collected.
• Statistical analyses explored correlations between BAT temperature, sex, BMI percentile, diet, and activity levels.

Main Results:

• Boys demonstrated significantly higher supraclavicular skin temperature at baseline and after cold exposure compared to girls, indicating greater BAT thermogenic response.
• A negative correlation was found between BAT temperature and BMI percentile, with sex differences persisting after BMI adjustment.
• Dietary intake (protein, vegetables) showed a sex-specific negative association with BAT temperature in girls, though this did not remain significant after multiple comparisons.

Conclusions:

• Sexual dimorphism exists in BAT thermogenic activity in school-aged children.
• Dietary factors may exert a sex-specific influence on BAT activity.
• Further research is warranted to quantify BAT's contribution to childhood energy balance and obesity development.