The goal of Calorie Restriction is to achieve a longer and healthier life by

• eating fewer calories
• consuming adequate vitamins, minerals, and other essential nutrients

• Avoid simple sugars and flours.
  Sugars and flours generally contain very little nutrition for their calorie content. They also have high glycemic indices, which means that your body absorbs them quickly, leaving you wanting more a short time later.
• Eat both green leafy (salad) and other vegetables.
  Vegetables -- both green leafy vegetables and non-leaf vegetables -- contain the highest content of a wide variety of nutrients for their calorie content. By volume (and often by calories), vegetables are the major component of many calorie restricted but not nutrient deficient diets.
• Carefully select your protein and fat sources.
  Both protein and fat are required macronutrients, but their form can have a significant influence on a person's risk factors for a wide variety of diseases.
• Make sure your protein intake is sufficient, but not overly abundant.
  Common recomendations for total protein intake range from 0.6 to 0.8 grams per kilogram of body weight, and some recommendations are much higher. This is probably a minimum.
• Make sure your proteins are complete and balanced.
  A complete protein contains all the essential amino acids, while a balanced protein contains all those amino acids in ratios that are most useful to human biophysiology.
• Select monounsaturated fats, avoid saturated fats, and consume some Omega-3 fats
  Foods containing monounsaturated fats include olive oil, almonds, hazelnuts, and avocados. Most of your fat intake should be from these foods. A very small amount of fat should be in the form of Omega-3 fatty acids. Caution: fatty foods, even healthy choices, are high in calories so be sure that you carefully track your intake so as to stay within your Calorie goal.