Fasting is known to normalize blood pressure in hypertensive patients. This applies both to long-term water fasting and intermittent fasting. The most interesting question is how long does the positive effect last after conclusion of fasting course? We found an answer in the studies by Russian authors, who used fasting for the treatment of hypertension and coronary heart disease. 14-day fasting has been found to normalize blood pressure for as many as 3 to 6 months. That is fasting can really help patients with hypertension. We translated a small piece of this work (see below).
Source: Muravyov S.A. & Makarova G.A. “Сardiovascular pathology” In Therapeutic fasting: guide for doctors, edited by Alexey Kokosov, pp 82-95, Moscow: SpetsLit, 2007.