YANBU @sailorcherries
Between October 2015 and June 2016, my friend spent 8 months losing 2 stone, by walking 3 miles four times a week, swimming twice a week, and cutting her food intake by about a third, and depriving herself of all the stuff she enjoys. Even after 6 months, just one person had said something about her weight loss; just ONE. Even though she dropped from 14 stone to 12 stone (she is 5 ft 5 ish.)
After a couple more months, a few more people started to comment. But the upshot is people didn't really notice for ages, until she started to wear different clothes, more suited to her new, slimmer shape.
Her weight then stalled at 12 stone for many months. However, she looks great, and at the age of 49, the (slow and steady) weight loss, and firming herself up by regular, gentle exercise, made her look 5 years younger.
Then about six months after she hit 12 stone, her husband lost 2.5 stone in 3 months. He is 5 ft 10 he was 15 and a half stone, and he dropped to 13 stone in 3 months. After having a tummy bug and losing 8 pounds in 5 days, he decided it was a kick start to a diet and started eating very little ...
His weight loss was quick (as it is for ALL men!) and he has been wallowing in his glory, boasting about how HUGE his 44 waist trousers are now, how loose his belt is, and how much better he feels now. Everyone is saying how noticeable it is, and he is puffing his chest out, and saying 'I am so proud of myself.'
In actual fact, it has aged him a bit, (he is 50 and looked 48-51 before and now looks 55,) and it's made him look a bit drawn and haggard. Still, he is insistent that he is going to lose another 2 stone! He is 13 stone now, and dropping to 11 stone is going to make him look ill.
My friend was pissed off with the same thing happened 10 years ago, (she lost weight and hardly anyone noticed, and then her husband lost a lot very quickly and people noticed HIS weight loss!) but she couldn't give a shit now, as she is happy with what SHE has done. She hit 12 stone a year ago and hasn't regained the 2 stone she lost, and she looks younger, and feels fitter.
She has re-introduced things she likes, but has less of them, and has smaller portions of everything. She goes for a swim of 35-40 lengths, or a (2-3 mile) walk almost every day. Her hubby just sits on his arse. He is still losing weight though, as he is not eating, bread, butter, cheese, pastry, cake, biscuits, chocolate, crisps, chips, ANYthing with carbs basically. As soon as he starts his old way of eating, the weight will pile back on.
So maybe you should take a leaf out of her book and not give a fuck.
Your sister is being a bit of a bitch actually, but I don't think she is doing it deliberately. Just ignore, and carry on with what you are doing. Then you can smile sweetly to yourself when she regains the weight....