In my case, I stopped seeing weight loss results because of a slower metabolism caused by the former weight loss. In 6 months, I had lost 30 pounds, then for the next 4-5 months, I stopped seeing and more weight loss even though I was lifting weights 3 times a week, 1 hour a day, and walking 3 miles 3 times a week. I wasn't doing anything wrong in my diet and workouts ( I ate a 2000-2500 calorie a day diet...no starvation..eating normally, but healthily) Lighter people have slower metabolisms than heavier people. I did eventually lose 5 more pounds after ramping up the exercise a bit, with less rest between sets. I had gotten lazy and my workouts had extended to 2 hours. Then I increased the poundage and sets and a 3 day flu also helped me lose more weight.
So as you lose weight, one needs to increase the intensity or difficulty of the workouts to compensate for the lower metabolism. Restricting calories even more might not be a good idea, since every study has claimed that diets don't work. Eat normal sized meals, but eat healthy, with lean meats, lots of fruits and veggies.