There is a type of food that must be taken on this day so that one will grow. If not taken, one will never age. The children will willingly swallow but maybe the ladies will be hesitant to consume.
This is the type of food that we call tangyuan (汤圆). They are glutinous rice balls cooked in syrup. Some tanyuan have filling of ground peanuts, black sesame or red bean paste. As for my family, we always have the plain tangyuan. When I was still a kid, my grandpa used to tell me that I should take the same number of glutinous rice balls as my age, with an extra one to symbolise the additional one year of age. However, I didn't see him taking 60+ tangyuan then.