Wow. I’d say to discuss it with someone else first, but on second thought, she might not appreciate learning that she had been the topic of discussion. Can you not just be candid and mention that you’re worried? Show up for coffee one Saturday morning and just tell her; “Mom, I’m kinda worried about you because…” and lay it all out. Is there any way that you could offer to go for walks with her or, I don’t know, ask if you could look in her kitchen and suggest s few substitute foods? Another thing to consider is that she may be depressed, or have an actual ED that should be evaluated by a doctor. How difficult is she to speak with? Is there a chance that she’ll just flip out if you approach her in a concerned manner?