This diet does not have enough protein or complex carbs. You don’t need a lot of protein, just enough. The portion size is dependent on the protein choice. The same holds true for complex carbs. Any body needs whole grains, such as rice, wheat germ, oatmeal, etc.; just not a lot. It also desperately craves vegetables. Most spring and summer vegetables in the U.S.A. are so low calorie that you can eat as much as you want. Fall and winter vegetables, such as potatoes, squashes, sweet peas, sweet corn and sweet tomatoes have higher starch and sugar contents so should be limited to about 4 ounces per day.
Try looking up portion sizes at nutrition websites such as http://www.cdc.gov/healthyweight/healthy_eating/portion_size.html or here: http://www.everydayhealth.com/diet-nutrition/portion-sizes.aspx
which says this:
Portion Control: Sizing Up Total Daily Portions
According to the USDA, current daily recommendations for a 2,000-calorie diet include:
5½ ounces of lean meat or 1¼ cups cooked beans
2½ cups of vegetables
2 cups of fruit
3 cups of low-fat or fat-free milk or the equivalent dairy products
3+ ounces of whole-grain products
You should be able to find the breakdown for a 1500 calorie diet as well, which should encourage your body to take off 2–3 pounds per week. Anything less than 1500 cals and most bodies head for starvation mode. And then you’re stuck not losing the weight as desired, which sucks.