Genetic contributions to human fatness: an adoption study.

Area of Science:

• Human genetics
• Obesity research
• Behavioral science

Background:

• Parental obesity is a risk factor for offspring obesity.
• Genetic and environmental factors contribute to obesity.
• Adoption studies help disentangle genetic and environmental influences.

Purpose of the Study:

• To investigate the heritability of fatness.
• To determine the influence of genetic versus environmental factors on adult offspring fatness.
• To examine the role of adoptive parents and early environment.

Main Methods:

• Studied adult adoptees separated from their biological mothers at birth.
• Assessed fatness in adoptees, biological mothers, and adoptive parents.
• Controlled for age, height, and environmental factors like upbringing and home environment.

Main Results:

• A strong correlation in fatness was observed between biological mothers and their adoptee offspring.
• This association remained significant after controlling for confounding variables.
• No correlation was found between adoptee fatness and adoptive parents' fatness.
• Environmental factors like rural upbringing and adoptive home disturbance predicted adoptee fatness.

Conclusions:

• Adoptee fatness is significantly influenced by genetic factors inherited from biological mothers.
• Environmental influences also play a role in adoptee fatness.
• Selective placement and gene-environment interactions appear minimal in this study.