Fast800 Misery

i did fast800 and you end up eating a lot of green veg, healthy proteins and fats. My partner would join me and would often not be able to finish the huge salads and meals. I would HIGHLY recommend the app over the books or just calculating it yourself.
the app gives you daily balanced meal plans and shopping lists. I found i spent significantly less on the weekly shop than I did previously and it was much much easier to stick to.

The whole point of fast800 is that it only lasts a few weeks then you move to 5:2 and then to maintenance once you hit your goal weight. You aren’t supposed to ‘sustain’ it indefinitely.

Or even up to 1800/1900 calories on non fast days. That way on a fast day you know you can look forward to larger portions of (healthy) meals the next day.

I’ve just started this but am the opposite. I’ve had to eat slices of cheese to get to 800 some days.

You could try Fast 800 two days a week and aim for 1500 calories the other five days.

I did the 5:2 diet this way (could never get as low as 500 calories on a fast day) and lost two stone over 4 months (12st to 10st).

"How much would I lose on a 1000 in a month?"

It depends what your BMR and TDEE are. You can find online calculators to work it out. No idea how accurate they are.

I don't know exactly what calorie deficit I'm in, I'm just trying to consume somewhere around 1500 to 1800 a day, (using the calculators 1852 is supposed to be my 'maintenance calories, I'm also around the same height as you) occasionally I'm lower but honestly I'd be floored if I did less than 1500 every day. I was 9 stone 5 at the beginning of July and I'm now 9 stone and a bit. I'm v happy to do it slowly - I think it's the best way. FWIW us shorter people do find it harder to lose weight, ho hum. Can you do 7k to 10k steps a day to boost your metabolism?

Every pound of fat lost is a 3,500 calorie deficit if that helps.

I can understand your frustration but honestly it will be best to be patient.

You’ll not be able to sustain 1000 calories a day, which will lead to less movement overall, low mood and an eventual binge. So save yourself the pain right now!

Do you know how many calories you were consuming each day to reach or maintain 15 stones? If not, start by tracking your ‘normal’ meals and snacks for a week or two. Then, once you have some data, decide what can be removed, what can be substituted for more filling or lower calorie alternatives and see where that then leaves you.

The idea for sustainable weight loss, without regain, is that the things you do to lose the weight must be maintained in order to sustain the weight loss. Eating at 1000 calories needs to be sustainable for life…is it?

Seriously, I understand that you are desperate but this approach you are using now will not work. You need to accept that there is only a longer-term answer for this long- term problem.

I tried the Fast800 and hated it. I was constantly hungry and didn’t have the energy to exercise. I know it works for some people but not for me.
Body coach was much more effective.
And now I log calories and exercise on my fitness pal and ensure I’m always in a calorie deficit.
If it’s making you miserable, stop. Find a different programme that you can follow and live your life. Otherwise it’ll be yet another yo-yo plan whilst you feel dreadful.

The reason it’s unhealthy OP is that you cannot maintain it, so you could starve yourself to 1000 for a month and you might manage to lose a stone but the following month you’ll put that stone straight back on PLUS some more because the restriction will just make you binge. The only way to successfully lose weight & keep that weight off is to change your lifestyle, accept that it is a journey, eat less, move more, and you may not lose weight as quickly BUT you’ll lose more over 12 months consistently losing 1lb a week than you will if you keep doing crash diets and just losing, re-gaining and then re-losing the same 14lb for 12 months.