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We're all living longer, but longevity increases not benefitting everybody
Date:12/14/2012

TORONTO, ON Global lifespans have risen dramatically in the past 40 years, but the increased life expectancy is not benefitting everybody equally, say University of Toronto researchers. In particular, adult males from low- and middle-income countries are losing ground.

People are living longer on average than they were in 1970, and those extra years of life are being achieved at lower cost, the researchers, led by U of T Chemical Engineering PhD candidate Ryan Hum, say in a paper published in the open access science journal eLife this month.

However, the costs for an extra year of life among adult males in lower-income countries are rising, Hum and his colleagues say, while the costs for an extra year of life among children worldwide and for adults in high-income countries continues to drop.

Hum, who is also a member of U of T's Centre for Global Engineering, co-wrote the paper with Professors Yu-Ling Cheng, director of the Centre, Prabhat Jha of the Dalla Lana School of Public Health and Anita McGahan of the Rotman School of Management.

The researchers made the discovery when they took the Michaelis-Menten (MM) equation a well-known mathematical model first used to analyze enzyme kinetics in 1913 and applied it to adult and child mortality at different incomes. They reasoned that just as chemical catalysts affect enzyme velocity; the public health catalysts react with income to affect life expectancy.

"We noticed the similarity in the curvature and became fascinated with the beauty of the analogy," said Hum. The MM equation is standard curriculum for biochemistry, biology and most chemical engineering undergraduate students and we knew there could be added knowledge that we could decipher purely from the math."

"Over the past few decades, research and development of new technologies (drugs, vaccines, policies) have focused mostly on childhood and infectious disease, with fewer worldwide invest
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Contact: Terry Lavender
terry.lavender@utoronto.ca
416-978-4498
University of Toronto Faculty of Applied Science & Engineering
Source:Eurekalert

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