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Most of the healthy supercultures in the world eat an abundance of dietary antioxidants from fruit, vegetables and sometimes whole grains. And they enjoy extraordinary good health and blood pressure throughout their lives. Clearly consuming dietary antioxidants does not cause too many problems since these people have virtually no heart disease or hypertension. (See my Review of Healthy at 100 for some examples of the supersupercultures.)
There are dozens of studies showing the benefits of antioxidants from dietary sources and here are just a few:
1. Protection Against a High Fat Meal. One study showed that eating a higher antioxidant meal helped protect participants from the nasty effects of a high fat meal. 
2. Protection Against Dementia. Low betacarotene levels (from food) were associated with increased risk for dementia in seniors. 
3. Bronchial Reactivity. Vitamin C in the diet was linked to "bronchial reactivity" in children, leaving them vulnerable to various upper respiratory conditions. 
4. Coronary Heart Disease. A study in Lancet of seniors showed that levels of Vitamins C and E and betacarotene in the diet were correlated with heart disease.  The reasons for this are probably due to multiple pathways, but the primary cause is that dietary antioxidants can actually prevent or slow down the oxidation of LDL cholesterol, which play a major role in the buildup of arterial plaque and hardening of the arteries.  One big study on women found that Vitamin E intake from diet was particularly strongly associated with lower rates of cardiovascular disease. 
Again, the list of studies could go on and on, but a meta-analysis summarized it best:
"At this time, the scientific evidence supports recommending consumption of a diet high in food sources of antioxidants and other cardioprotective nutrients, such as fruits, vegetables, whole grains, and nuts, instead of antioxidant supplements to reduce risk of CVD." 
Now none of these proves that there was no vasoconstriction going on in some cases. However, clearly vasoconstriction does not seem to be any kind of significantl factor based on literally dozens of different studies such as these. Why would asthma, heart disease and dementia risks - all dependent on and associated with blood flow in many ways - do so well with dietary antioxidants if dietary antioxidants are a health issue and restrict blood flow? It just does not make sense.
And, again, why is increased fruit, vegetable and whole grain consumption associated with decreased blood pressure in patients with hypertension if antioxidants are quenching hydrogen peroxide. Read about the DASH Diet, which is currently one of the common recommendations by the medical profession for high blood pressure: it's core is a plant-based diet loaded with antioxidants.
The bottom line is always: eat a whole foods, plant-based diet rich in antioxidants and anti-inflammatories for maximum health and sexual function.
2) J Am Coll Cardiol,Epub 2007 Sep 10, 2007 Sep 25, 50(13):1272-8, "Important role of endogenous hydrogen peroxide in pacing-induced metabolic coronary vasodilation in dogs in vivo"
3) Experimental Physiology, Sep 2009, 94(9):961-971, The effects of antioxidants on microvascular oxygenation and blood flow in skeletal muscle of young rats"
5) Am J Clin Nutr, Jan 2003, 771(1):139-143, "Effect of dietary antioxidants on postprandial endothelial dysfunction induced by a high-fat meal in healthy subjects"
6) QJM, 1999, 92(9):527-530, "Interaction of dietary antioxidants in vivo: how fruit and vegetables prevent disease?"
7) Am J Epidemiol 1996; 144:275–80, "Dietary Antioxidants and Cognitive Function in a Population-based Sample of Older Persons The Rotterdam Study"
8) Thorax, 1997;52:166-170, , "Bronchial reactivity and dietary antioxidants"
9) Lancet, 23 Oct 1993, 342(8878):1007–1011, "Dietaryantioxidant flavonoids and risk of coronary heart disease: the Zutphen Elderly Study"
10) Arteriosclerosis, Thrombosis, and Vascular Biology, 1998; 18:1506-1513, "Dietary Antio11) N Engl J Med, 1996, 334:1156-1162, "Dietary Antioxidant Vitamins and Death from Coronary Heart Disease in Postmenopausal Women"
11) N Engl J Med, 1996, 334:1156–1162, "Dietary antioxidant vitamins and death from coronary heart disease in postmenopausal women"
12) Circulation, 2004; 110:637-641, "Antioxidant Vitamin Supplements and Cardiovascular Disease"
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