Aw yeh I think I'd be the same with roast!! But when I make my daughters meals I just let myself sniff it really close to get a good nose full... And FOR ME... I'm not suggesting for anyone else!.... But for me, as soon as I get close to the food it's like it just twigs that actually yes it smells nice but I don't want to eat it. If I avoid it then I obsess about it. Only when iv got my face in it can I find that realisation that it's only the smell I want!! Obviously other people might find it the other way round. Yesterday I made my daughter toad in the hole and it smelt delicious and as I was chopping it up I really wanted some. Then I picked up a sausage and put it right by my nose and sniffed it for ages. And my desire instantly dispersed.
Just stay strong and know that food is only a temporary enjoyment. Being slim and confident... Wearing the clothes you want and loving yourself is a permanent, life changing enjoyment that will benefit you and your whole family. A roast, as lovely as it is, right now it's your enemy and you just have to focus on your goal and your strength to defeat it!!! Good luck, you can do it! X