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Is Onion bad for low blood pressure? 

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By thinning the blood garlic can lower blood pressure by 5 to 10 percent.
Experimental studies have shown that the consumption of onion reduces blood pressure, stimulate haematopoiesis, heals heart and blood vessels, helps in treatment of asthma, and protects against some types of cancer.
In conclusion, consuming raw Welsh onion juice, but not boiled juice, has blood pressure lowering and antithrombotic effects in rats.
These results suggest that dietary onion extract is beneficial for improving diabetes by decreasing lipid levels.
These results indicate that onion decreased blood glucose, serum lipid levels and reduced renal oxidative stress in STZ-induced diabetic rats and this effect might exert the anti-diabetic effect of onion.
It is inferred that this beneficial ameliorating influence of dietary onion on diabetic nephropathy may be mediated through onion's ability to lower blood cholesterol levels and to reduce lipid peroxidation.
These results suggest that the green-leafy Welsh onion, but not the white type, reduced superoxide generation by suppressing the angiotensine II production and then the NADH/NADPH oxidase activity, increasing the NO availability in the aorta, and consequently lowering the blood pressure in the rats fed with the HFS diet.
These results suggest that, although the antioxidant activity of red Welsh onion is weaker than the white one, antioxidant activity together with hypolipidemic effect of red Welsh onion might work favorably to suppress the increase in blood pressure.
Therefore, tomato can reduce high blood pressure, too.

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How Garlic Help Lower High Blood Pressure?4 answersGarlic helps lower high blood pressure by inducing vasodilation and relaxation of blood vessels, thus reducing blood pressure. Garlic contains allicin, a compound that stimulates the production of nitric oxide (NO). Nitric oxide acts on the enzyme responsible for the conversion of GTP to cGMP, which induces smooth muscle cell relaxation and vasodilation, leading to a reduction in blood pressure. Additionally, garlic can regulate blood sugar levels and strengthen the body's defenses against allergies, further contributing to the management of hypertension. Garlic extract supplementation has been shown to lower systolic blood pressure in chronic hemodialysis patients. Furthermore, garlic water steeping therapy has been found to reduce blood pressure in patients with hypertension. Overall, garlic's ability to lower blood pressure is attributed to its various biological activities, including the induction of vasodilation and relaxation of blood vessels.
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