By the way, I wouldn't recommend high dose resveratrol for longevity yet unless trying to cure a disease such as cancer or diabetes. There is data that high dose resveratrol can be harmful in rats in conditions such as strokes, ulcers, etc.
http://resveratrolne.....e Renewed.htm
http://resveratrolne.....ic Ulcers.htm
This is a commercial site for low-dose resveratrol plus magical ingredients longtitude pills. I have corresponded with Mr B>S> who runs it trying to get him to specify what studies supported this position.
He has repeatedly claimed the Auwerx study and Sinclair's study in mice on a normal diet showed high dose res shortened the mouse life-span. Negatory. Examination of the paper and the supplemental data showed no such thing. The res fed mice showed no statistically significant extension or diminution of life span over normal diet mice. Interestingly the calorically restricted mice fed resveratrol slightly outlived calorically restricted mice without resveratrol, and both outlived normal-diet mice. The data as presented in no way supports the claim that high-dose resveratrol shortens rodent life-span. If there were any data that it did, it shoud have been published with the study, Mr.BS continues to make the claim despite the fact it is false, and only changes the subject when called on it.
The claim that high dose res weakens heart muscle is based on a study at University of Connecticut. They force-fed (gavage) rats various doses of resveratrol -- equivalent to several grams in a human -- then cut out their hearts and kept them beating in a chemical bath, They then cut off oxygen for a period of time and measured how long the hearts continued to beat. The res fed rat hearts.stopped beating sooner. One can conclude that resveratrol damaged the hearts, but this has little to do with what might happen to hearts in a healthy body, even under stress. An alternate explanation to Das's anthropomorphic "death-signal" from resveratrol is this: resveratrol stimulates apoptosis, a process in which damaged cells effectively commit suicide and die. The hearts of resveratrol fed rats died, because the damaged cells ceased to function sooner. Again, translating this into a dosage recommendation i humans, healthy or otherwise, but still alive wih beating hearts in their bodies, is in a word IMPOSSIBLE.
The papers are:
Resveratrol delays age-related deterioration and mimics transcriptional aspects of dietary restriction without extending life span.
Pearson KJ, Baur JA, Lewis KN, Peshkin L, Price NL, Labinskyy N, Swindell WR, Kamara D, Minor RK, Perez E, Jamieson HA, Zhang Y, Dunn SR, Sharma K, Pleshko N, Woollett LA, Csiszar A, Ikeno Y, Le Couteur D, Elliott PJ, Becker KG, Navas P, Ingram DK, Wolf NS, Ungvari Z, Sinclair DA, de Cabo R.
Cell Metab. 2008 Aug;8(2):157-68. Epub 2008 Jul 3.
PMID: 18599363
J Nutr Biochem. 2009 Jun;20(6):443-52. Epub 2008 Sep 11.
Resveratrol, a unique phytoalexin present in red wine, delivers either survival signal or death signal to the ischemic myocardium depending on dose.
Dudley J, Das S, Mukherjee S, Das DK.
Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, CT 06030-1110, USA.
Recent studies have demonstrated the cardioprotective abilities of resveratrol, a polyphenolic antioxidant present in red wine. Resveratrol can also kill cancer cells at relatively higher doses by exerting a death signal. We reasoned that resveratrol might possess the ability to protect the cells at lower doses as observed during pharmacological preconditioning of the heart, while at higher doses cause cell death as found for cancer cells. To test this hypothesis, rats were randomly fed for 14 days by gavaging any of the four doses of resveratrol - 2.5, 5.0, 25 or 50 mg/kg - while vehicle-fed animals served as placebo control. After 14 days, isolated working hearts were prepared from both experimental and control animals, and the hearts were subjected to 30-min global ischemia followed by 2 h of reperfusion. The rats fed either 2.5 or 5 mg/kg dose of resveratrol for 14 days provided cardioprotection as evidenced by improved post-ischemic ventricular recovery and reduction of myocardial infarct size and cardiomyocyte apoptosis compared to control. In contrast, the hearts fed either 25 or 50 mg/kg dose of resveratrol depressed cardiac function and increased myocardial infarct size and number of apoptotic cells. The results for Western blots and RT-PCR demonstrated an increase of protein and RNA transcripts of redox proteins including thioredoxin (Trx)-1, Trx-2, glutaredoxin (Grx)-1, Grx-2, redox factor Ref-1 as well as redox-sensitive transcription factor NFkappaB, and survival factors such as phosphorylated-Akt (p-Akt), and Bcl-2 in the animals fed lower doses (2.5 and 5 mg/kg) of resveratrol, while the reverse was true for the animals fed higher doses (25 and 50 mg/kg) of resveratrol. The results thus indicate that at lower doses (2.5 or 5 mg/kg), resveratrol exerts survival signal by up-regulating anti-apoptotic and redox proteins Akt and Bcl-2, while at higher doses (>25 mg/kg), it potentiates a death signal by down-regulating redox proteins and up-regulating pro-apoptotic proteins.
PMID: 18789672
Hmmn, the Yankees won. I can go to bed now.
Edited by maxwatt, 05 November 2009 - 06:31 AM.