I don't count calories at all, so that's not something I'd hurry to buy. Trust me, if you cut down on your carb. intake you will lose weight. I didn't actually need to lose much weight when I decided to cut down on carbs. but it was an added bonus to find I lost 1 and 1/2 stones in a relatively short space of time and I have now levelled out at a weight I am very happy with.
I did buy the Diabetes Solution but if you want something a bit cheaper that has the same sort of message,I'd recommend you get 'The Diabetes Revolution' by Dr Charles Clark.I found this an easier read than Bernstein and very useful.Both books have recipes in them too. I know a lot swear by the Bernstein book but Clark's book is my personal preference. You might get this cheaper on Amazon or again you could try on ebay.
All the best, choccie.
P.S. The Collins Little Gem Carb. Counter book is a useful little book and is dirt cheap.