This book is absolutely fantastic! I was recently diagnosed with PCOS which affects your insulin levels and was recommended by my GP to follow a low GI diet. I've spent the last few years (before being diagnosed with PCOS)sticking to a low fat diet, and despite reading many books on low GI I was really struggling to get to grips with it. That was until I found this book in my local library, and found it so useful and informative that I had to buy it! It explains all the reasons behind eating a low GI diet, as well as explaining the different food groups you should be eating and giving specific portion sizes according to your weight. It also gives a 12-week plan to ease you gently into it, and to help you change the way you think about food. I've been unsuccessfully trying to lose weight for about 18 months now, but after a couple of months sticking to this eating plan I've lost a few pounds, which I'm ecstatic about (it's incredibly difficult to lose weight when you have PCOS)! I'd say that whatever your current state of health, this is a very healthy way of eating, and I'll certainly be following it 'for life' - I recommend you do the same!