Neighbours panicing on my behalf makes me put on weight

I can't get myself out of a cycle - my weight seems to fluctuate between 17.5 stone and 18 stone. I actually have quite a big problem because as soon as I reach 17.5 stone - neighbours, family notice this and start cooking me meals and offering me personal appearance/dietary advice. I DON'T NEED THIS! The problem is: I've not studied diet and nutrition, I don't have an interest in fashion/clothes and I have type 2 diabeties so hence the necessity and urgency to get down to a reasonable weight of 12 or 13 stone. It's just starting to get irritating because this happens every time I get down to 17.5 stone and I just can't break the cycle because I am always coming into contact with these people, don't have the money to spend time away and really can't be bothered putting up a counter argument with other people elsewhere who will probably want to try and intervene in a very similar way to these neighbours/friends.

I really don't know how to get below 17.5 stone without neighbours/relatives commenting on it and therefore making me feel self conscious, leading to feeling depressed and then gaining weight back up to 18 stone again!