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?
not only follow a vegan diet but extend the philosophy into other areas of their lives, and oppose the use of animals for any purpose. Another term is "environmental veganism", which refers to the avoidance of animal products on the premise that the industrial farming of animals is environmentally damaging and unsustainable.
Well-planned vegan diets are regarded as appropriate for all stages of life, including during infancy and pregnancy, by the American Academy of Nutrition and Dietetics, Dietitians of Canada, Australian National Health and Medical Research Council
-based pet food and the ethical problems it poses for vegans, some vegans extend their philosophy to include the diets of pets. This is particularly true for domesticated cats and dogs, for which vegan pet food is both available and nutritionally complete, such as Vegepet. However, this practice has been met with caution and criticism, especially toward vegan cat diets due to felids being obligate carnivores. Furthermore, although nutritionally complete vegan pet diets are comparable to meat-based ones for cats and dogs, many commercial vegan pet food