Influence of Supervision and Modeling
In addition, older siblings are models for younger siblings, and the eating habits of the older child may be emulated by the youngsters. If the older sibling has a pseudo-parental role and is obese, the younger siblings may engage her bad eating habits and also become obese.
Research Results Regarding Birth Order and Obesity
A study conducted in Japan noted that boys from families that had four or more children, boys who had no brothers or sisters, and boys from families with only two children were at higher risk for obesity.
Yet another study showed that first-born children in African-American households were high risk for obesity.
Personality Factors, Birth Order, and Obesity Surgery
Family size is also a factor for those seeking obesity surgery. A Florida based study concluded that birth order and number of family members are influential when making a decision about gastric bypass surgery. Sixty three percent of the subjects in the Florida study were either the oldest or youngest child in a household with four siblings.
My Bariatric Life