Sorry this is a bit long.
The TLDR is: HELP - how do I handle an 11yo girl being a bit overweight and calling herself fat without giving her issues while at the same time making sure she doesn't gain more weight?
DD(11) is a bit overweight. I don't know what she weighs, but she carries a fair bit of weight on her tummy and clothes that fit in all other ways will be too tight on her waist. Periods haven't started yet, but she is pretty developed. She's always had a bit of a tummy, but it's become increasingly noticeable in the last 12 months.
We never talk about weight at home. I never talk about my body negatively, or about dieting or about food being 'fattening' or anything like that. However, DD is increasingly calling herself 'fat' or pointing out her 'big tummy' and I don't know what to say. If I say she's not, she calls me a liar. I try to talk about positive body image, but then she says 'so I am fat?!?' All her friends are very slim, so she also compares herself to them.
I really don't know how to approach it. My mum pointed out my 'puppy fat' at this age and said various other self-image-damaging things that took me a long time to get over. Is it ok to point out to her the relationship between nutrition and weight? How do I do it without implying she's overweight? I don't want to create food issues, but I'm not sure how much she's really aware of the cause-and-effect (despite it being covered loads in school).
Gentle/ covert changes at home in terms of diet and exercise haven't seemed to make any difference.
She doesn't do a lot of exercise (two after-school sports clubs + stuff in school) and isn't a naturally sporty or active person. Neither was I at her age. We've tried encouraging additional exercise, but she is very very resistant and told me the other night that every time we tell her she needs to get more exercise it makes her feel bad about herself and that's she's fat (we've never talked about exercise being related to weight loss and I know that weight loss is 99% diet anyway. We always associate it with positive mental health and just 'being healthy'). Family exercise (e.g. a walk or bike ride) on weekends is tricky because her younger brother does tons of sport (and is very slim) and he, reasonably I think, doesn't want to come home from 3hrs of sport on a Saturday morning to go on a walk.
Her diet is ok in terms of range, but she loves inherently 'fattening' things (butter, mayonaise, sweet food of any description, garlic bread, etc) and I feel like I'm always telling her to put less butter on her bread, etc. But she doesn't eat secretly or anything like that. I think they have a normal amount of treats/ junky food - she's not scarfing family packs of pringles or anything like that. I don't want to completely ban all sweet treats as then they become 'a thing'. The rest of the family is slim/ healthy weight.
So as not to drip feed. She is neurodivergent (we're going through the assessment process at the moment, but likely ADHD and possibly ASD too)