So is the doctor wrong?

bmi is a chart based on standards of people and their height, etc... excursive everyday doesn't mean necessarily go to the gym every day, take the stairs instead of the elevator or walk to work "if plausible" and swimming is an extent form of excursive. height doesn't really matter that much but if you went from "overweight" to "obeise" over 1 inch you should be excersing more because you would have been on the tip of overweight and almost considered obeise. you could have ask your intake nurse to measure your height, they do weight and should be able to do height as well. also meals per day means nothing, i actually tell people to eat several small meals throughout the day to keep you metabolism high and working constantly.