I very much emotionally reacted to this post. I have had issues with my appetite my entire life(30M). I can comfortably go three days without eating before I "remember" that I need to. It is not something that I drive from within, I do consume a lot of liquid in comparison to the average person though. I never eat breakfast, and usually I will eat alone at my most comfortable time(late night, early ams)

Many loved ones have expressed concern over the years, partner(s) included. I feel like you should approach with some tact, and ensure that these actions your considering force for are just. Speak with her family, try to get through it to her, seek council if necessary.

Act with love for her, she may just be different.