Diet high in protein and high fat increases the alkalinity in blood causing it to thicken, leading to high blood pressure and other heart ailments. It is believed that organic acids found in fruits, vegetables and vinegar not only provide body with important minerals such as potassium, calcium and magnesium, vinegar affects the acid-alkali balance thus thins the blood. This in turn helps lower blood pressure and improves blood circulation. Acetic acid found in vinegar long believed to boost metabolism and dissolve fats.