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Weight loss chat

A space to talk openly about weight loss journeys and challenges. Mumsnet hasn't checked the qualifications of anyone posting here. You may wish to speak to a medical professional before starting any diet.

After major weight loss (BMI 48.5 -> 30) should I aim for healthy BMI or maintain?

27 replies

PuzzledObserver · 28/03/2026 10:31

I have been morbidly obese the vast majority of my adult life. At my biggest, my BMI was 48.5. I have yo-yo’d down and up, many, many times. I have long known that the problem was my dysfunctional eating, and that my weight was a symptom. But that knowledge did not enable me to change.

A couple of years ago I started yet another weight loss attempt, prompted by health and mobility concerns. I did really well for over a year, then the familiar story: a return to binge eating, total loss of control, rapid regain. Only this time, I managed to put a lid on it, having only regained 18lb of the 5.5 stone I had lost. I joined a program which deals with the disfunctional eating. I lost part of the regain, then stabilised.

And here I am now, with a BMI somewhere around 30, but pretty much weight stable. I am wearing the same size clothes as I was over a year ago and have done so continuously all that time. It’s a bloody miracle.

So here’s the thing: for someone who starts out as obese to get to the healthy BMI range is very uncommon. And to stay there, even less so. If you start out morbidly obese, the probabilities are even lower.

Medically speaking, I have improved my health situation hugely by reducing my BMI from 41.5 a couple of years ago, and all time high of 48.5, to 30. If I could reduce it to 25, my risks would be even lower. So logically I should try to do that. But the probability of success is very low, and presumably the effort required would be huge. Whereas I do seem to be able to maintain my current weight.

Have you travelled this road? What did you decide?

OP posts:
PuzzledObserver · 01/04/2026 09:54

Chatsbots · 31/03/2026 14:52

If you're older, it's better to be slightly above BMI guidance. You can find papers on this.

I'd look at your body composition & work out what you need.

Bone & muscle matter & all weight loss involves a % of muscle loss too.

So my bmi is 36 but if I lost 7kg, my fat mass would be 30%, which is acceptable for someone my age. I'd still be obese probably but to get to less than that is really difficult for me. I want to avoid yoyo diets as weight gain is usually fat, so you end up more unhealthy every cycle.

My gym has one of those body analyser things - a bio impedance scale with hand grips - and according to that my BMI this morning was 29.8 and my body fat % is 38.2%. I think from what I’ve read I should be trying to get my BF% under 35? I’m 62.

Interesting to compare with 2 years ago - basically almost 80% of the weight I’ve lost has been fat, and just under 20% muscle, with the remainder being water plus a tiny bit of bone. But before anyone panics about that, my bone mass is still way above the average for women my age (who are users of this scanner system) at 2.7kg versus 2.0kg.

i apparently have 5.6kg more muscle and 9.9kg more fat than the average 62 year old woman as well. Though some of that will be because I’m above average height (5’7”)

OP posts:
PuzzledObserver · 01/04/2026 10:25

Chatsbots · 31/03/2026 14:52

If you're older, it's better to be slightly above BMI guidance. You can find papers on this.

I'd look at your body composition & work out what you need.

Bone & muscle matter & all weight loss involves a % of muscle loss too.

So my bmi is 36 but if I lost 7kg, my fat mass would be 30%, which is acceptable for someone my age. I'd still be obese probably but to get to less than that is really difficult for me. I want to avoid yoyo diets as weight gain is usually fat, so you end up more unhealthy every cycle.

Just had a look at this, and it appears that if I lose another stone of which 80% is fat, then I will just get my body fat% under the top end of recommended. The alternative I guess is to add a few kg of muscle, but that’s a non-trivial task.

The other factor to take into account is waist to height ratio. Mine is currently 0.51, I need to reduce my waist by 1.5cm to get it to 0.5

OP posts:
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