Tracey, Adrienne,
Some thoughts: -
I believe that those silly folk lose weight and sometimes quite quickly when they stop taking insulin because they eventually start producing ketones i.e. when the body has to burn fat to get energy because it cannot get any from carbs digested with insulin. This accelerates the removal of fat from your body and hence you lose weight. This is why people often lose a lot of weight before they first diagnosed as type one before they take their first insulin. It is also this principal that I believe the Atkins diet is based upon except there you stop eating carbs rather than have no insulin to digest them properly with.
So you are likely to lose weight when you become DKA but as Adrienne says you also increase the likelihood of suffering the more extreme complications. I am sure there are some sad cases where, for example, someone has gained a slimmer figure but at the cost of some or all of their vision and hence can no longer see how they now look.
I think if you have insulin active in your body then it does enhance your appetite, it is another of the body's natural self-defence mechanisms to prevent hypos. One possible cause of weight gain when using a pump may be that although you are taking less insulin overall you are taking more short acting insulin and maybe this insulin enhances your appetite more than the long lasting stuff. But I do not know if this is true or not.
I also get the impression that being on a pump has not caused Tracey to eat more.
Also Tracey when I have had frequent hypos I do sometimes worry about the calories in all the fast acting glucose -mainly jelly babies in my case- that I end up having to swallow. Is there a low calorie means of stopping hypos? Not that I will stop taking jelly babies, I may as well get something I enjoy out of them hypos happening.
I also think Roxanne is correct that starting a new exercise regime can cause weight gain initially because those heavy muscles start to grow. I remember when I first started jogging, years before I went on a pump, I was unhappy when I initially gained weight, especially as I hated the actual act of going for a run. Eventually however, it did fall back off and I felt much better from having the regular exercise once more.
Good luck Tracey for losing those pounds before your holiday. I think it is when enjoying activities like an holiday that the extra flexibility that the pump regime provides really comes into its own.
😉