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How do I deal with this safely

LA0R0O LA0R0O 2026-11-11 09:19:40 About question
My younger sister is, kind of obsessed with weight? I dont know the right terminology, but she's very strict about her diet, and she thinks that being healthy is being thin. I've tried telling her before that her mentality is wrong and that she is causing herself a lot of struggle doing that

I have never judged someone for being overweight or underweight, I'm underweight myself and I'm veryy determined on trying to gain weight for my own health. All of us grew up under my mum's fatphobia and my sisters think that anything 55+ KG is fat, which is literally insane to me. They undergo harsh diets just to be underweight and anytime we face call they literally look skin and bones. I don't like that and I honestly just wish for them to understand that they're harming themselves by trying to look fit at all times.

The problem started a while ago when my younger sister started losing hair and growing dandruff which caused a bad irritation on her scalp, and it got to a point where she literally has bald patches on her head, now yesterday my mum took her to a doctor, and they told her it's due to lack of vitamins etc, but she didn't like that because it meant she will have to eat more and gain weight

My mum is a hypocrite at best, she's telling my sister to eat more, but I know that she will also make fun of her / mock her if she gains weight too. It happened to me when I literally reached the ideal weight for me, she called me fat and asked me to eat less. I want my sister to gain weight for her own health while also making her confident enough that whatever my mum says doesn't affect her heavily. I know my mum wont change so I want to help my sister instead but Im running out if solutions