Can I eat below my calorie target if I have diabetes?

Two years ago I had a bowel resection due to cancer. During investigations I was found to also need pancreatic surgery and lost 2/3 of my pancreas. As a result I am a Type 1 diabetic. I also need digestive enzymes to digest things like meat or fats. I am now veggie to avoid the need for continually taking the capsules with meals. I have another 3.5 stone to lose, having lost 2.5 stone already through just cutting down on portion size and cutting down on fats. I am trying to be a bit more organised about things now, and so came here where I was given a 1400 calorie/200 exercise a day regimen, which suits me fine and my blood sugars are good. I find that most days I don't need all those calories. Should I stuff them down anyway (I usually have about 200 spare at the end of the day) to avoid my body thinking its being starved? I usually eat about six or seven portions of fruit and veg each day alongside my essential carbs. I drink plenty and am usually on target with that. Most of our food is fresh cooked and we are careful about its content because of the diabetes. I am exercising for over an hour each day five or six days a week, doing 30 minutes free weights work, and floor exercises for the remainder of the time. I will be building up the cardio as soon as the better weather comes and I can get outdoors - it's not worth the arguments with my husband at the moment. Because of my health history he tends to be very protective of me, which is sweet and I don't want to upset him too much. We don't have any spare money to go to a gym or anything. I could build up cardio at home I guess, but it would have to be with DVD workouts. In a nutshell - is it OK to eat between 100 and 200 short of my 1400 each day?