Hi @Pepperypottery. Yes, I did function well with that level of calorie restriction but I did have a few days when I needed to open my eating window earlier than usual and go for slightly more calories (after week 12).
First half, once I'd got through the first two weeks, when yes, my body was adapting and I had some days of feeling a bit faint or shivery, I was fine. Probably only 4 or 5 days in all of feeling rough, and I knew going so hardcore so fast was the reason and if I'd adapted more slowly I probably would not have had this..
What I really love about IF is that I get less hungry - I think there's something physiological as others mention it a lot, once thru the first 2-3 weeks. And for me eating relatively big portions in a short window makes me feel full and satisfied in a way no other diet ever has - and then I dont get hungry for the rest of the day. I really did not get hungry often doing it ... perhaps once every 10-12 days - and I just told myself that hunger is nothing to be scared of, and that it was far better for my health to lose the weight.
You asked what made me so committed to the process....
- Feeling totally fed up how often I had dieted and how much of my life I had wasted either dieting or feeling guilty about not dieting and just not wanting to do that any longer - My life is too valuable. Having realised this, I made myself spend a lot of time thinking about this, so I really felt it.
2.Having the time to commit to it - I recognised that it was a big thing I was taking on, and saying this is THE most important thing I am doing for these 6 months. I probably spent 30mins - 2.5 hours each day reading inspiring posts (on Mumsnet and Gin Stephens website) and books about dieting and in the second half I read more and more about gut health and enjoyed putting really great gut feeders into my diet. So yes, I over-invested in short term knowing I wouldn't be successful otherwise.
3.Vanity!!!!!! Yes, this is the embarrassing one.... I asked myself why I couldnt lose much weight when Covid first came out - when my life might have depended on it, but could do so later We had a Uni reunion where I would be seeing lots of people I hadn't seen for 20 years... Vanity meant I wanted to look darn good and sexy!! Yup... the image of walking into the room looking like the woman I wanted to, really motivated me... and it worked... That was the first 13 weeks .. (MM also talks about how fast weight loss is really good BECAUSE it motivates us, and that during those first 12 weeks we don't change our metabolism (ie it doesnt adapt to having less calories, but usually does AFTER 12 weeks, so it is a magic window))
- Public commitment and a buddy. I told my friends and had a weekly check in with one of them who was also losing weight.
Good luck - it is tough - and I think we need to be realistic that if we are losing more than a stone, it is a major investment of time and energy and adapt our life so that we can do it. And also that there are times in our lives when other things are more important - and that is okay.