Cautious Studies Tend to Disprove Dietary Longevity Claims

A research group is presently working through a grand tour of replicating longevity claims in mice, using careful and cautious study designs that eliminate calorie restriction effects as much as is possible. This sort of approach shows that many past claims of dietary additions that modestly extend life in mice were probably the result of inadvertent calorie restriction - which is why you have to look carefully at every study to make sure that researchers controlled for this issue. Calorie restriction has a comparatively large effect on life span in smaller animals, such that even mild restriction can swamp all other contributions to life span that occur in a study: Phytonutrients reportedly extend the lifespan of C. elegans, Drosophila, and mice. We tested extracts of blueberry, pomegranate, green and black tea, cinnamon, sesame, and French maritime pine bark (Pycnogenol and taxifolin), as well as curcumin, morin, and quercetin for their effects on the lifespan of mice. While many of these phytonutrients reportedly extend the lifespan of model organisms, we found no significant effect on the lifespan of male, F1 hybrid mice, even though the dosages used reportedly produce defined therapeutic endpoints in mice. The compounds were fed beginning at 12 months of age. The control and treatment groups were isocaloric with respect to one another. A 40% calorically restricted and other groups not reported here did experience lifespan extension. Body weights were unchanged relativ...
Source: Fight Aging! - Category: Health Medicine and Bioethics Commentators Authors: Tags: Daily News Source Type: blogs