这项研究发表在《美国临床营养学杂志》(American Journal of Clinical Nutrition)上，证实了维生素c的重要作用。然而，更高的剂量可能更好。在一项研究中，那些每天摄入2克维生素C的人在30天内的收缩压下降了10个点。这可与高血压药物如ACE抑制剂的效果相媲美。
Vitamin C lowers blood pressure and sugar
Patrick 25 Apr 2012 Reading time 2 mins
A meta-analysis of twenty nine trials confirms that a mere 500mg of vitamin C a day lowers high blood pressure by 5 points in eight weeks.
This study, published in the American Journal of Clinical Nutrition, confirms this important effect of vitamin C. However, higher doses may be even better. In one study, those given 2 grams of vitamin C a day for 30 days had a 10 point drop in systolic blood pressure. This is comparable to the effect you can get with hypertensive drugs such as ACE inhibitors. Taking high- dose vitamin C makes a lot of sense if you have heart disease, because it does lower LDL cholesterol when given to healthy people, diabetics and people on kidney dialysis, and it has also been shown to reduce arterial thickening. It is also an anti-inflammatory and may help, together with vitamin E, to stop the oxidation, or damage, of cholesterol.
A recent study of almost 60,000 people in Japan reports that vitamin C intake is strongly associated with a reduced risk of heart disease, especially in women, cutting risk by a third. Another reports that vitamin C, with vitamin E, slows down atherosclerosis. Many diet studies also find that the higher your dietary intake of vitamin C the lower your risk. It also lowers risk of diabetes by 62%, if you consume at least 1 gram a day. Diabetics given 1g of vit C have a significant decrease in both their blood sugar levels and glycosylated haemoglobin, as well as triglycerides and cholesterol. Unlike the drug alternatives such as ACE inhibitors and diuretics, which knock out zinc and magnesium respectively, both important for cardiovascular health, there are no adverse effects of taking vitamin C. It is also less expensive.
So, why don't doctors recommend everyone with cardiovascular disease or diabetes take 2 gram a day, which is what I take? You know the answer: because mainstream medicine has an unhealthy bias towards drugs and away from supplements because drugs are patentable, profitable and heavily marketed to doctors, while vitamins are not. If you'd like to find out more I'm giving seminars in Ireland and the UK on how to prevent and reverse both heart disease and diabetes. Also read Ten Secrets of Healthy Ageing, Say No to Diabetes and Say No to Heart Disease.