Question

Current estimates suggest that given the current epidemic of overweight and obesity among children and youths, their life expectancy will

Answer 1

I believe the answer is: shorter than their parents

Various studies indicates that being obese since adolescense growth would put more pressure the sekeletal structure that support childrens' body.
This would potentially minimize the bone's ability to expand/elongate, which resulted in shorter by the time they enter adulthood.