Weight Loss

I have lost about 2 stone since August without trying although I dont eat as much as I was. I was always a big eater so dont know why this has happened. Sometimes I just dont feel like eating, can medication cause this or is it nothing to do with my diabetes. I am due at nurse on Wednesday so dont know how my blood sugar levels etc will find out then. Thanks for any advice :?

Yes I am Metformin but have been for about 6 years so did not think it would cause appetitie loss now. I had read it could cause appetitie loss but thought it would have before now.