| I also had/have that problem!!! I weighed 142, tho doctors never considered that a problem since I was very active and exercised but the weight did not come off. Then when diagnosed with diabetes and on metformin, within 2 months lost 22 lbs like it was nothing, The doctor then took me off meds to see if diet and exercise would do it since I had good tests...big mistake since I could not control my bs by still eating the right amount of carbs/calories - lost 8 lbs in one week! so back on meds, tho changed to different type metformin and larger dosage, and so far have been able to eat the amount of calories/carbs to maintain my new weight without too much problem, tho I have not weighted this week to see.
Take the weight you want to be, multiply by 10 if not active, or multiply by 13 if moderately active or a woman over 55. This gives you the amount of calories you need to maintain your weight. (then divide the calories in half since half of calories should be carbs for the day, spread out for meals, snacks - then divide that in 4 since a carb equals 4 calories. this gives you the amount of carbs needed. example me: 112lb times 13 equal 1456, then 1/2 equals 728 divided by 4 equals 182 carbs for the day. If the food item does have a lot of fiber you can subtract that from the carb amt shown on the label.
I do tend to keep my carbs lower but try to maintain my calories and that should help you maintain your weight or even help you gain some.  | 
