Need Some Encouragement

I've been working hard since New Years to be healthier. I started out by cutting out the pop and chips, then started doing the tredmill 3 times a week. I've been dieting for the last 3 weeks (less than 1400 calories a day, low carb) tredmilling at a moderate pace for 30 min 3 times a week and doing heavy yard work at least once a week...I haven't lost an ounce, and I'm getting really discouraged. When I was younger the weight went as easy as it came. Now, I'm 27, 225 lbs and I just want to get back to where I was. Any tips or encouragement would be greatly appreciated. Thanks.