One tip when thinking about nutrition is nutrient density. How rich in nutrients is the food you're eating - not by weight, but by calorie? You would be surprised to learn, for example, that when measured by CALORIES, a vegetable like broccoli is surprisingly high in protein - comparable, calorie for calorie, to the amount of protein found in red meats. But of course you can eat far more broccoli for the same amount of calories, which also provides fiber, vitamin C, and folic acid.