Do you think that vegan diets reduce the chronic heart disease?
Yes - vegan diets avoid the bad fats that are associated with heart disease. 
I have vegan friends and some of them are ethical vegans. 
What is an ethical vegan as opposed to a regular vegan?
They do not only follow vegan diet but also avoid using any animal products.
Interesting, are you a vegan?
Vegan nutrition
Vegan nutrition refers to the nutritional and human health aspects of vegan diets. A well-planned, balanced vegan diet is suitable to meet all recommendations for nutrients in every stage of human life. Improperly planned vegan diets may be deficient in vitamin B, vitamin D, calcium, iodine, iron, zinc and riboflavin (vitamin B). Preliminary evidence from clinical research indicates that a vegan diet may lower the risk of cancer.
Background.
Vegan diets, compared to standard diets, tend to be
States, has noted, “Research shows that plant-based diets are cost-effective, low-risk interventions that may lower body mass index, blood pressure, HbA1C, and cholesterol levels. They may also reduce the number of medications needed to treat chronic diseases and lower ischemic heart disease mortality rates.” The American Institute for Cancer Research has stated, “When focusing on specific types of vegetarian diets, the vegan diets showed protection for overall cancer incidence also.”
Vegan diet Pregnancy, infants and children.