Genetics plays no role in our sickness, fatness, baldness, cancer, diabetes. All sickness depends on cicumstances and diet. If we are human then we can get all human diseases equal as any other human. All diseases have a possiblity of being cured.
All people even Inuit can thrive on a good vegetarian diet, and their diet does also include plant based foods. As a whole, the Inuit have among the shortest lifespans compared to other cultures. Vegetarian diet is only threating if the diet consists of poor food choices such as processed foods.