I have gained 2 stone since being on insulin. I was previously underweight had DKA then diagnosed as type 1 LADA. I am concerned that I may put on more weight if I start using an insulin pump. I am going for a NHS review to discuss using a pump
As far as I know (have been on injections for 40 odd years and pumps for about 14 I think) I didn't notice a great deal of change to my weight between the two related to the change in insulin delivery.
It can mean you have more flexibility to eat on HCL (hybrid closed loop) which is the current NHS pump stuff - basically the pump has intelligence so reacts to your changing BG and gives more/less insulin as you body needs it without you thinking about it.
That can mean we put more weight on as we have more freedom to eat stuff, and think less about needing an injection etc - that bit is self management to not eat the extra.
The big benefits when its set up correctly are better time in range, less thinking about BG and calculations, more freedom to eat when you want to not because you have to, better quality of sleep and less chance of lows.
I'd go for it - if you don't like it you can always switch back (I'd never consider it for myself - its so much safer than when I was on MDI)