I lost over 30 kg last year. Look at
http://diet.webhop.org if you want to read what I did in detail (no I'm not selling anything).
1. It's all about energy
2. If energy eaten is greater than energy used, you will gain weight.
3. If you "can't seem to lose weight", you either have a biological problem (extremely unlikely and too easily blamed), or you need to make a realistic effort to find the source of excess energy in your diet. One lady I know was doing everything right except eating lots of cheese because someone told her the calcium and protein was good for her. She was eating 3 times the energy level of the rest of her diet in cheese alone, and she wasn't eating a huge amount of it!
About carbohydrates ... focus on getting ALL your carbs from fruit and vegetables. To lose weight quickly without starving yourself, eat LOTS of vegetables and salads, small LEAN meat portions, and avoid entirely any grain products. It is a common misconception, propagated by the silly "food pyramid" we all grew up with, that you MUST eat grain products. Try it for 3 weeks and I guarantee your clothes will start to feel looser.
Focus on feeling well-fed through vegetables and fruit, don't think you need to fill up on bread. Feeling peckish? Reach for an apple or similar, not the carb-filled rice cakes or Ryvita crackers.
I don't like preaching to people if they don't want to hear it, so you can read more on my web page if you like, which I did when I got sick of so many people asking "how'd you do it?!"
Another disclaimer: this is what worked for me, your results may be different.
Here's a couple of quotes for you:
"My eating decisions made me fat, and only my eating decisions will change that"
And this one's mine:
"You cannot achieve what you have not first imagined ... "
Cheers,
wishtobflying
Brisbane, Australia