Maybe I should change my alias to Nostradamus? You may not remember this, but a while ago you commented on a thread, and I told you this exact thing would happen. Look here:http://www.fatsecret.com/Community.aspx?pa=fp&m=176727#176727
It's not the food, it's how you look at it. Eating ground beef doesn't make you gain weight specifically, it just adds weight to your stomach temporary (while your body is digesting it). Obviously, if I eat a 16 oz steak, and weight myself right after, I will have gained a pound (assuming the 16 oz was measured post-cooking).
Eat more. You have to realize that you were losing weight faster than a recent amputee! You should have taken things much slower. There's a reason why people recommend you lose only one or two pounds per week. Anything more, and it's a sign that you're stressing your body too much. You have to give your body room to progress. If you're already eating only 1500 calories a day, what happens when you get to a point where your body adapts to that amount of calories? Well, I guess you just found out.
My recommendation to you would be to up your calorie intake drastically, decrease your cardio, and increase the amount of resistance training you do. Your metabolism will see a larger boost, your muscles won't be stripped, and if you consistently keep upping the intensity (start slow!) then you won't see these stalls. Lastly, weigh yourself once a week so that the little bits of food you eat don't freak you out. Remember to take measurements! A lot of times people lose a lot of fat, but don't lose weight because of water/muscle replacing it. You need to see the complete picture. Remember, also, that if you start eating more now you will gain some weight, but this is only temporary
until your body's metabolism fixes the mess you've made. Don't sweat it, champ.
Good luck, and let us know if you have more questions.
If you think my post is too abrasive, harsh, or offensive, you're:
B) Too sensitive.
C) Not going to receive an apology for pointing it out.