Had ednos but now its anorexia. im still healthy wt (bmi 20.6). thyroid hormones were fine on recent blood test.does that mean my bmr isnt slowed yet?

BMR complicated: It is complicated to calculate true BMR, as both overweight and underweight people can have a low BMR. Activity, body muscle/fat proportion, insulin and other hormonal factors all contribute and thyroid hormone is only one factor. When the body senses starvation, especially with a low BMI, basal metabolic rate will slow down to conserve calories, so keeping weight in the normal range is helpful.