Vitamin C Tag

06 Feb

Posted at 21:48h in Author Interviews, Heart Disease, Surgical Research, Vitamin C
MedicalResearch.com Interview with: [caption id="attachment_25990" align="alignleft" width="180"]Dr-Harri-Hemilae.jpg Dr. Harri Hemilae[/caption] Harri Hemilä, MD, PhD Department of Public Health University of Helsinki MedicalResearch.com: What is the background for this study? Response: I have a long term interest in vitamin C. Previously I have shown that it alleviates exercise-induced bronchoconstriction (EIB) (http://dx.doi.org/10.1186/1710-1492-10-58 ) and shortens the duration of colds ( http://dx.doi.org/10.1371/journal.pmed.0020168 ). Now I had been following the literature and I noted that a number of randomized trials were being published about vitamin C for preventing post-operative atrial fibrillation (POAF). Therefore I reasoned that it is worthwhile to analyze that set of trials

25 Mar

Posted at 13:51h in Author Interviews, Ophthalmology, Vitamin C
MedicalResearch.com Interview with: [caption id="attachment_22861" align="alignleft" width="151"]Christopher J. Hammond, MD, FRCOphth Departments of Ophthalmology & Twin Research King's College London St. Thomas' Hospital London UK Dr. Chris Hammond[/caption] Christopher J. Hammond, MD, FRCOphth Departments of Ophthalmology & Twin Research King's College London St. Thomas' Hospital London UK  MedicalResearch.com: What is the background for this study? What are the main findings? Dr. Hammond: Twin studies allow us to quantify the influence of genes vs environment on a trait and this study suggests 65% of variation of cataract progression is due to environmental factors. Vitamin C has long been linked to cataract because the lens of the eye is bathed in fluid rich in ascorbate, a derivative of vitamin C. We showed that, even in a relatively well-nourished UK population, those in the highest third of vitamin C dietary intake (equating to something like 3 times the RDA of 60mg) had a third less progression of lens opacities.

27 Mar

Posted at 01:08h in Anemia, Author Interviews, Kidney Disease, Vitamin C
MedicalResearch.com Interview with: Dr. Tanjim Sultana MD Department of Nephrology Lenox Hill Hospital New York Medical Research: What is the background for this study? What are the main findings? Response: Almost all dialysis patients are anemic. One quarter of patients requiring High dose Epogen have functional iron deficiency, which means they have adequate iron store but unable to utilize it. Vitamin C has been shown to mobilize iron from their storage and making it available to use in red blood cell production. Prior studies showed intravenous high dose vitamin C could increase hemoglobin levels and decrease epogen requirement. In our study we used daily low dose oral vitamin C in functional iron deficient patients to achieve the same goals. Patients taking daily low dose vitamin C for 3 months had significant decrease in their epogen dose compared to the control group.

14 Dec

Posted at 14:15h in Author Interviews, Pulmonary Disease, Vitamin C
Harri Hemilä, MD PhD Department of Public Health University of Helsinki, POB 41 Helsinki, FinlandMedicalResearch.com Interview with: Harri Hemilä, MD PhD Department of Public Health University of Helsinki, POB 41 Helsinki, Finland   Medical Research: What is the background for this study? What are the main findings? Dr. Hemilä: I have a two decade interest in the effects of vitamin C on respiratory symptoms and I am the first author of the Cochrane review on vitamin C and the common cold. Since there is very strong evidence that vitamin C is better than placebo, in the Cochrane review we encourage common cold patients to try if vitamin C helps them. In 2009, I was taking a look at the Cochrane review on vitamin C and asthma. I was puzzled with the text and figures since my own impression of the RCTs on vitamin C and asthma was quite different from what the review presented. Therefore I took a close look at the Cochrane review and I saw that it was sloppy. There were severe errors in data extraction and data analysis. For example, they used un-paired t-test when they should have used the paired t-test. That types of questions are very basic in biostatistics. I wrote a feedback to that Cochrane review and the review was withdrawn in 2013. It had been misleading readers for a decade. As a positive result of that incident, I became interested in the effects of vitamin C on asthma and I conducted a meta-analysis of three RCTs on vitamin C and exercise-induced bronchoconstriction (EIB). I calculated that vitamin C caused a 48% reduction (95% CI 33% to 64%) in the postexercise FEV1 decline. That study was published in BMJ Open in 2013 (http://www.ncbi.nlm.nih.gov/pubmed/23794586).

30 Aug

Posted at 17:57h in Author Interviews, JACC, Kidney Disease, Vitamin C
MedicalResearch.com Interview with: Umar Sadat, MD, PhD Addenbrooke’s Hospital Cambridge, United Kingdom MedicalResearch.com: What are the main findings of the study? Dr. Sadat: Vitamin C offers significant nephroprotection against contrast induced-acute kidney injury (CI-AKI) in patients undergoing coronary angiography. Patients receiving Vitamin C were observed to have 33% less risk of CI-AKI compared to those receiving placebo or other treatment.

02 Jul

Posted at 00:17h in Author Interviews, Nature, UCSF, Vitamin C
Interview with: Miguel Ramalho-Santos, Ph.D. University of California - San Francisco stem-cell scientist,MedicalResearch.com  Interview with: Miguel Ramalho-Santos, Ph.D. University of California - San Francisco stem-cell scientist, Vitamin C induces Tet-dependent DNA demethylation and a blastocyst-like state in ES cells MedicalResearch.com: What are the main findings of the study? Answer: We found that Vitamin C has a profound effect in the regulation of gene activity in cultured mouse embryonic stem cells. Vitamin C specifically enhances the action of enzymes called Tet's, which remove certain chemical modifications to DNA (methylation). In this way, Vitamin C makes cultured mouse embryonic stem cells behave more like the early cells in the embryo that they represent.