In another thread about the (in)famous resveratrol studies, we have a slow discussion about diet and study results of research in mouse models. In a way, humans possibly impose their culture (or other goals) on diets of these mice, but also there is a high level of uncertainty about other influences over which we do not have control.
The study below did look a human cohort studies that often fail to produce proof of the effects of supplementation that seem to be the result when testing on smaller scale with more control over other parameters. This could be related to the above issue, but maybe there are other issues playing a role? The psychological approach results in the following insight: people taking supplements feel kind of invulnerable to competing effects of behavior, leading to canceling out positive effects of supplementation.
It's not only the pill that matters, but also (and maybe even foremost) culture and psychology.
http://www.ncbi.nlm....pubmed/21764996
Ironic effects of dietary supplementation: illusory invulnerability created by taking dietary supplements licenses health-risk behaviors.
Chiou WB, Yang CC, Wan CS.
Source
1Institute of Education, National Sun Yat-Sen University.
Abstract
The use of dietary supplements and the health status of individuals have an asymmetrical relationship: The growing market for dietary supplements appears not to be associated with an improvement in public health. Building on the notion of licensing, or the tendency for positive choices to license subsequent self-indulgent choices, we argue that because dietary supplements are perceived as conferring health advantages, use of such supplements may create an illusory sense of invulnerability that disinhibits unhealthy behaviors. In two experiments, participants who took placebo pills that they believed were dietary supplements exhibited the licensing effect across multiple forms of health-related behavior: They expressed less desire to engage in exercise and more desire to engage in hedonic activities (Experiment 1), expressed greater preference for a buffet over an organic meal (Experiment 1), and walked less to benefit their health (Experiment 2) compared with participants who were told the pills were a placebo. A mediational analysis indicated that perceived invulnerability was an underlying mechanism for these effects. Thus, a license associated with the use of dietary supplements may operate within cycles of behaviors that alternately protect and endanger health.
PMID: 21764996 [PubMed - in process]
Edited by Brainbox, 04 September 2011 - 01:00 PM.