Hi!
One suggestion may be to add more fat to your diet. We all know how hard that concept is to overcome based on years of being told that fat was bad, but often people find that the additional calories from fat helped their bodies to let go of their stored fat (not to mention that fat is high in calories and therefore you can get more calories in by eating the same amount as you usually would).
Nat has many posts on this if you check out her journal. Many of us experience a decrease in appetite for a number of reasons. Some of which are: protein tends to make you feel fuller longer (digesting a steak will take longer than digesting a bunch of Oreo cookies), we aren't stuffing ourselves with foods that bloat us so our bodies get used to eating more normal portions of food, and our blood sugars are more leveled out, so we are not constantly feeding our cravings to avoid the lows that accompany sugar highs.
Just as your body may get used to a particular exercise routine, thereby making it less effective than it was in the beginning, our bodies can get used to eating the same foods. Try to mix it up a bit. Don't be afraid of extra calories. This is not to say that you should eat as much as you can all the time, but take a day here and there where you increase your carbs. You can either do this with additional vegetables, fruits, or whole grains, or indulge in that slice of pizza or dessert. Many people here have "free" days when they eat whatever they want for a whole day and tend to lose weight after it. This has broken stalls for me more than once.
Just be aware that if you are heavily addicted to sugar that a day like this can turn into a downward spiral to old ways quite quickly, so make sure that you restrict it all to one day.
When you read about 10-12x your body weight in calories as a guideline, it is more of a guideline for people that do not do a lot of regular exercise. It is more of a basic guideline of what your body needs to perform its daily tasks. If you follow a regular exercise regimen, by all means increase your calorie intake. Your body will thank you for it!!
Remember that we are all individuals and that what works for me may not work for you, and what works for you may not work for the next person. It may take a bit of experimentation, but with a little trial and error you will find what works best for you. I found that gradual changes worked best for me, but the "carb up" days every once in a while worked wonders in breaking stalls for me.
All the best!
KC