I've had the same experience - 6 months, lost 2stone / 14kg. Gone from juuuust Obese to juuust normal. First diet, didn't even try others becuase I knew I woudlnt be able to keep to them. This is only 2 days in the week though.
It is not easy; anyone who tells you weight loss is easy is trying to get money from ya. But it -is- rewarding. The days themselves are a strain at first but the good news is that .. well there's lots, actually.
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you start to -taste- food more. it smells better, it tastes better and you appreciate it more. real sensory experience
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you wake up the next morning and oddly, you aren't starving.
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it is soooo nice loosing the weight. you feel better. I assume you're a parent; I've just realised that I've lost 14kg which is the weight of my little boy, who gets pretty darn heavy to carry around pretty quick. I've lost the weight of my son!
The weight loss slows down, but that's okay. Don't push yourself too hard. it gets too hard then. And eat a good meal the night before, without actually pigging out.
In the end, if it succeeds depends on if you want to loose weight enough not to cheat. I did, and I also started swimming aroudn the same time ( Im sure the speed of weight loss comes half-and-half from diet and swimming). Bit of exercise + diet = unbeatable. Except for your bank balance, a whole new wardrobe wasn't cheap.
Since, shockingly, I found out I'm preg again last week after giving up all hope for years, I've called a halt to the 5/2 diet reluctantly. Not as reluctantly as giving up wine, but still reluctantly. I miss it already; for all the hard days, it's only one day and the sheer delicious taste of food after a diet day, plus the weight loss, is a real nice thing.