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Study: Fat maintenance is a predictor of the murine lifespan response to dietary restriction

This article archives the study titled: Fat maintenance is a predictor of the murine lifespan response to dietary restriction:

1) Article

Article: Mouse study turns fat-loss/longevity link on its head – Science Daily, 5/3/11

“studied the effect of food restriction on fat and weight loss in 41 genetically different strains of mice. The scientists then correlated the amount of fat reduction to life span … The answer: Mice that maintained their fat actually lived longer. Those that lost fat died earlier … People are best advised to adopt a moderate approach, not losing all fat but definitely not keeping unhealthy amounts of fat, either … None of the mice in this study were what we would consider to be obese”

Archived article: Mouse-Study-Turns-Fat-Loss-longevity-Link-on-Its-Head.pdf

2) Journal reference:

Chen-Yu Liao, Brad A. Rikke, Thomas E. Johnson, Jonathan A.L. Gelfond, Vivian Diaz, James F. Nelson. Fat Maintenance Is a Predictor of the Murine Lifespan Response to Dietary Restriction. Aging Cell, 2011; DOI: 10.1111/j.1474-9726.2011.00702.x

Journal Summary:

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Fat maintenance is a predictor of the murine lifespan response to dietary restriction     1. Chen-Yu Liao1,2,    2. Brad A. Rikke3,    3. Thomas E. Johnson3,4,    4. Jonathan A. L. Gelfond2,5,    5. Vivian Diaz2,    6. James F. Nelson1,2  Article first published online: 25 APR 2011  DOI: 10.1111/j.1474-9726.2011.00702.x

Summary

Dietary restriction (DR), one of the most robust life-extending manipulations, is usually associated with reduced adiposity. This reduction is hypothesized to be important in the life-extending effect of DR, because excess adiposity is associated with metabolic and age-related disease.

Previously, we described remarkable variation in the lifespan response of 41 recombinant inbred strains of mice to DR, ranging from life extension to life shortening. Here, we used this variation to determine the relationship of lifespan modulation under DR to fat loss.

Across strains, DR life extension correlated inversely with fat reduction, measured at midlife (males, r = −0.41, P < 0.05, n = 38 strains; females, r = −0.63, P < 0.001, n = 33 strains) and later ages.

Thus, strains with the least reduction in fat were more likely to show life extension, and those with the greatest reduction were more likely to have shortened lifespan.

We identified two significant quantitative trait loci (QTLs) affecting fat mass under DR in males but none for lifespan, precluding the confirmation of these loci as coordinate modulators of adiposity and longevity.

Our data also provide evidence for a QTL previously shown to affect fuel efficiency under DR. In summary, the data do not support an important role for fat reduction in life extension by DR. They suggest instead that factors associated with maintaining adiposity are important for survival and life extension under DR.






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