Same boat.  She just shoves garbage in her face without thinking. She already has type 2 diabetes which she didn't tell me about. I saw it reading her patient chart while transferring her to a hospital to be admitted to for an infection. She was hospitalised for 2 weeks.  No matter how many conversations about the health risks and even begging and pleading for her to stop shoving junk food in her mouth she won't.  One of the last times I visited, after a previous long heart to heart, I saw she had gone through McDonald's for lunch. I told her "I'm glad to see eating McDonald's is more important to you than living long enough to meet your grandkids".  Did she change? No. She came to visit me later. We stopped at a museum cafe for lunch. She ate an entire Mac and cheese, and an entire desert. I glared at her.....she is allegedly trying to lose weight. My partner says "oh I have your cheese!" And hands her this cheese stick snack he had in his bag. He was leaving so gave it to her.  She opens the cheese and starts eating it! I fucking lost it.  "Why the fuck are you eating that cheese after you just ate a 1500 calorie meal!?! There is no fucking way you are still hungry!" Watching someone you love slowly kill themselves while you are helpless to stop them is infuriating. It's what makes me hate every single person who says "big is beautiful" or that fat is ok.