Radiological evidence to changes in the olfactory bulb volume depending on body mass index in the childhood

•The olfactory control of energy homeostasis is maintained through the interplay of the olfactory bulb with adipose tissue.•Bimodal changes in olfactory bulb volume indicate that olfactory control acts to provide energy balance depend on BMI.•This study showed that the olfactory bulb volume was higher in overweight and obese but smaller in morbidly obese children