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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.

Am I wrong in thinking losing weight by calorie deficit will only end badly

5 replies

doodlydooo · 05/10/2024 21:36

About a decade ago I was at my fittest and this was through a good diet and good exercise. I learned a lot about healthy eating and exercise via a very good personal trainer.

She taught me that the best way to lose weight was through exercise and eating at least your BMR (mine was something like 2000). At the time it felt very counterintuitive but she told me to trust the process. She said one's metabolism is like a fire that needs to be stoked (with calories) and depriving it would make fat burning less than optimal. She also said how you would plateau at some point with weight loss if you ate say 1200 calories and then what? To what end would you keep reducing it. And ultimately you would eventually start eating a normal amount of calories and that would definitely cause weight gain.

Once I saw that through exercise (at the time it was 30min HIIT/circuits 4 times a week) and eating my BMR was going well (I used to have abs can ye believe!) I continued eating my BMR and never less. And it was great as I was never hungry.

Unfortunately life happened. After my DC a year and a half ago I became increasingly sedentary (mostly depression, quit my job, LOTS of aches and pains after childbirth etc) and really piled it on. I am now 16stones at 5ft3in.

I am hoping to take Mounjaro soon and appreciate how a part of how it works is through appetite suppression. I've been reading posts about how some people struggle to get their calories in.

My question really is, does one eat their BMR or is one in a calorie deficit? And if MJ means losing weight through calorie deficit then wouldn't you be:

  1. destroying the "ferocity" of your metabolism (or it's ability to burn fat well)
  2. gaining weight back as soon as you eat a healthy and normal amount of calories once you come off it

Would love some advice (and sorry for the very long post!)

OP posts:
NutellaEllaElla · 05/10/2024 21:40

BMR stands for Basal Metabolic Rate and is the amount of calories you would burn if you laid in bed all day. This decreases with age so go to a calculator to re-calculate if you're interested.

Anyway, if you eat your BMR, you will be eating a calorie deficit because hopefully, you're moving. Your TDEE is your BMR + calories burned in usual activity levels. If you eat your TDEE, you will maintain your weight.

Some people's idea of what a healthy/normal amount of calories is, is incorrect and likely got them to being overweight.

doodlydooo · 05/10/2024 21:43

NutellaEllaElla · 05/10/2024 21:40

BMR stands for Basal Metabolic Rate and is the amount of calories you would burn if you laid in bed all day. This decreases with age so go to a calculator to re-calculate if you're interested.

Anyway, if you eat your BMR, you will be eating a calorie deficit because hopefully, you're moving. Your TDEE is your BMR + calories burned in usual activity levels. If you eat your TDEE, you will maintain your weight.

Some people's idea of what a healthy/normal amount of calories is, is incorrect and likely got them to being overweight.

Oh poop, I'm so sorry, I did mean TDEE!! But I'm too late to edit! Urgh.

Is losing weight through MJ done by eating TDEE?

OP posts:
NutellaEllaElla · 05/10/2024 21:44

You have to eat at a calorie deficit to lose weight. MJ and the like just reduce your drive to eat as far as i'm aware but happy to be educated by those more in the know.

doodleschnoodle · 05/10/2024 21:55

You have to eat a calorie deficit to lose weight. Exercise just makes you burn more calories so you can either eat more and still maintain a deficit or increase the deficit.

On MJ it makes it easier to eat a calorie deficit as you feel full on small portions and have a suppressed appetite.

There's lots of research going on about metabolism and metabolic disorders which do mean the basic calories in/calories out thing might not be the whole story. But broadly speaking, if you're losing weight it's because you are burning more calories than you are eating, and that doesn't actually require any exercise at all.

doodleschnoodle · 05/10/2024 21:59

The book 'Why we eat too much' by Dr Andrew something has interesting stuff about this all.

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