A remarkable study into the lifestyles of two isolated Amazonian tribes revealed diet is a major factor affecting blood pressure. Scientists observed that the people of one of the studied tribes maintain the same blood pressure throughout their entire lives. Researchers believe that this is due to their consistent diet, which is high in fruit and fiber and very low in fats and salt – a stark contrast to the diet of people within the industrialized world. These findings upend the common belief that age is a direct and inevitable factor leading to hypertension.