Thats a totally doable goal. I've been dieting since August and have lost over 50 since then. I'm really limiting my calorie intake and eating small portions. My usual day consists of;
Breakfast:
1 Yoplait no fat yogurt, sometimes I sprinkle some Kashi crunchy cereal in it.
Lunch:
1 Yoplait no fat yogurt
1 Apple
1 Orange
1/2 cup of soy nuts
Dinner:
It depends, I sometime just have a salad, sometimes pasta. Dinner is the biggest meal, but I keep it reasonable and I try to eat it early so I don't go to bed with a full stomach.
Also, I'm a vegetarian, so that helps with the fat intake. My goal for the summer is to lose another 40 by July.