Most people fall short on grains, but get more than enough protein in their diets. A balanced diet based on the Food Guide Pyramid. You'll have more success with a high-fiber, low fat diet with at least 30 minutes of exercise daily. Fad diets typically eliminate certain foods or groups of foods. They are not an effective way to lose weight for good.
Nutrient deficiencies are just part of the picture.
Fad diets also contribute to liver and kidney problems, heart disease, and osteoporosis. I highly recommend a balance of wholesome foods from the five food groups. To build your own plan, take a look at the Food Guide Pyramid. You'll see it on food labels, on cereal boxes, bread bags, et cetera. If you are an active woman, or like most men, choose the number of servings in the mid-range.