I would say they lack protein, because meat is the main source for protein in a persons diet, and if thats taken away then you have to find new ways to get that protein back. Like with eggs and nuts, etc. -hope this helps :3
Exercise increases the heart rate, heart output and it also increases the amount of blood pounded into the body at every heart beat. But in the cases of people who have adapted to exercise, it reduces their heart rate.
It is important for doctors to do so, so that they can prescribe the proper treatment. If they do not know how a certain body function works, it can lead to a lot of additional problems