Well done for the weight loss, Danielle. If it helps, perhaps if your uncle was proud of you for it too, you could dedicate your continuing efforts to his memory. Grief takes all sorts of different forms in people. In my case, although I am overweight, I found I completely lost my appetite after my mum died a couple of years ago, but decided later, when I felt stronger, that as someone who always enjoyed her food, she would want me to keep eating properly and enjoying mine and that gave me the incentive to start cooking properly for myself more often. It hardly seems worth it when it is just you you are doing it for, so in a way now, I am doing it for her, because that's what she would want for me.
Also there are other things you could do. You could start a memory box with items that hold special significance for your relationship with him, or put together an album of photos of him to look at when you are missing him. If he encouraged you in your weight loss efforts, perhaps you could do some kind of sponsored activity in his memory and donate the proceeds to a charity he supported?
If you have had the will-power to make it this far, I am certain you have the will-power to find a way to avoid comfort eating in dealing with loss too. Wishing you well.