"In studying the rate of death among adults younger than age 50, we found that there was no improvement among men who were overweight or obese as teenagers," said Amir Tirosh from Brigham and Women's Hospital in Boston.


The study analysed records for more than 2.1 million teenagers who were evaluated for compulsory military service in Israel. They were born between the years 1950 and 1993.


Researchers calculated the teenagers' body mass index at the time of evaluation and checked their death records. They found mortality rates were 41 percent lower among normal weight teenagers who were born in the 1980s than teens of a similar weight who were born thirty years earlier.


The study also found that overweight and obese teenagers were at a higher risk of death before the age of 50. In US average lifespan has increased by more than a decade since 1950.

The study appeared in the Journal of Clinical Endocrinology &amp;amp; Metabolism.


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