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Measurement of Lifespan in Drosophila melanogaster
Published on: January 7, 2013
Nutrients, not caloric restriction, extend lifespan in Queensland fruit flies (Bactrocera tryoni)
Benjamin G Fanson1, Christopher W Weldon, Diana Pérez-Staples
1Department of Brain, Behaviour and Evolution, Macquarie University, Sydney, NSW 2109, Australia. bfanson@gmail.com
Aging Cell
|June 30, 2009
Summary
Dietary nutrients, not just caloric restriction, significantly impact lifespan and reproduction. Compensatory feeding behavior in fruit flies highlights the importance of nutrient balance over calorie reduction for longevity.
Area of Science:
- Entomology
- Nutritional Science
- Gerontology
Background:
- Caloric restriction (CR) is a widely accepted mechanism for increased lifespan (LS), but nutrient roles are debated.
- Experimental separation of CR and nutrient effects is difficult due to compensatory feeding (CF).
Purpose of the Study:
- To quantify CF and determine the influence of calories and nutrients on LS and fecundity in fruit flies (Bactrocera tryoni).
Main Methods:
- Flies were fed 28 diets with varying carbohydrate:protein (C:P) ratios and concentrations.
- Compensatory feeding was measured by solution volume imbibed.
- Flies were also offered choices of sucrose and yeast solutions at different concentrations.
Main Results:
- Flies exhibited compensatory feeding, maintaining caloric intake across most dilutions.
- Maximum LS was achieved at a C:P ratio of 21:1, with LS generally decreasing as caloric intake fell.
- Lifetime egg production peaked at a C:P ratio of 3:1.
- Flies regulated nutrient intake to achieve a C:P ratio of 3:1 when given choices.
Conclusions:
- Compensatory feeding can overcome dietary dilutions, complicating CR studies.
- Nutrient balance, particularly the C:P ratio, appears to be a dominant factor influencing LS and fecundity, rather than CR alone.
- Accurate measurement of intake is crucial for DR studies to account for CF.
