Well, after dieting and exercising vigorously, I've plateued (spelling) for a while. Finally found the reason behind it - I've not been eating enough.
I took in about 1200 kcal daily, and burned around 800 through exercise, leaving my body with only 400 to work with. My weight stopped dropping, even went up, because it went into starvation mode and nommed onto muscles for energy instead of fat.
So guys and girls, be careful of your intake. You *must* consume at least 1200 calories for your body to still burn fat, and that's with exercise included.
So for example, you workout in the morning, burn 600 calories, so you have a deficit of calories which need to be replaced:
-600 (calories burned) + 1800 (calories taken in) = 1200 (weight loss calorie deficit)
I've used the 1200 in my example for my body mass, height and age, producing an approximate number to be reached for weight loss (2 pounds per week). I suggest googling for a BMR calculator to see your daily caloric needs, and work from there.
If you own a smartphone, I would suggest downloading an application called MyFitnessPal, it's free (with some annoying ads) and it has a massive database of foods to track your daily calorie intake and usage. You can also add in your own foods, etc.
Anyway, I hope this helps out someone out there to lose weight. Wish you all luck with it, I know it's a pain.