Clearly, our responses to today's obesity-promoting environment, in tandem with genetic influences, are the most significant causes of overweight and obesity. But in some people, drug side effects, illnesses, and genetic disorders can also play a role.
Master's degree programs for RNs with a bachelor's degree generally take 1-3 years to complete, depending on the school and the specialty. Graduates with a non-nursing bachelor's degree have the option of enrolling in a BSN-to-master's degree fast-track program.
After medical school, he or she must complete a residency in anesthesiology (usually four years) until being able to practice independently. . In the US, it would take, at a minimum, 4 years of college, 4 years of medical school, a 1 year internship, and generally 3 years of residency to become an Anesthesiologist. (An RN needs 1 to 2 years after college to become a nurse  anesthetist.)   It takes 4 years of Undergraduate Study at a University of your  choice, 4 years at a Medical School of your choice, and about 2-4  years of Internship.