I think this goes to illustrate very well how it's better to take unbiased measurements such as BMI or a pair of jeans you used to fit, rather than manufacturers clothing sizes to determine your healthy weight.
Clothing sizes vary enormously - I can be a size 10 from Sainsburys, a 14 from M&S, and XL at Max Mara
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I know for me that BMI is a reasonable scale - it's quite a wide range, and whilst there will be some outliers it seems generous enough to me. I'm 5ft6 so my top weight for a BMI of 25 is 11st2. That seems fair enough to me, even at 11st2 I feel a little lardy but as long as I am healthy, that's the key thing to me. I'm slightly over that at the minute so I am cutting back a bit and logging on MFP.
It's not a painful process as I swear that I am done with the likes of Weight Watchers where I spend all my time thinking about the point value of this, that and the other - so boring.
Almost as boring as people that are within the healthy weight range banging on about how they used to weigh 8 st and feel a bit chunky at 9st. I spent my 20s and early 30s at 10 stone, I went to the gym 3 x per week, I watched what I ate, looking back at photos I had a cracking figure, but did I appreciate it - did I heck. I was never going to weigh much less due to fairly broad shoulders and build, but instead of really enjoying my body at the time I thought I was fat. So now I am actually technically officially fat, I'm trying just to enjoy the process and appreciate myself as I am whilst making sensible food choices.