I was 212 lbs (511 height) about two years ago. i cut back calories a lot and am now 136 with a bmi of 19. my doctor said 19 is on the low side and wants me to gain weight and see a counselor. is 19 low? weight has been stable the last 4 months?

Low normal: The appropriate weight for a person who is 5'11" is between 140-171lbs. A normal BMI is between 18.5 and 24.9. Since you are 139lbs and BMI of 19 you are at the lower end of normal. I believe that what your Dr is concerned about may be the drastic weight loss you have had in 2 years. Persons who lose this much weight in such a short time are at high risk of eating disorders.

28 y lost 76 lb diet: Good weight loss. I do not know you and have examined/talked to you so cannot make any recommendations. I would go to uptodate.com and read about DASH diet.