What's not mentioned here is that people who follow extreme calorie reduction don't just cut calories, they also carefully engineer their diets so that every single bite they eat is chosen for its nutritional density. They don't avoid the Reuben sandwich because it'll put them over their calorie limit - they avoid it because it's got a lot of largely empty calories.

Would I do it? No - I enjoy food far too much. BUT - would I do it a LITTLE? Definitely! I've replaced my old milk-and-cereal breakfasts by home-made green smoothies. And each ingredient is carefully chosen for its nutritional density. My current smoothie-of-choice is very low calorie, and ALSO high in fiber, protein, vitamins, and minerals (and yes, it still tastes good)

Check it out, at

naturallyradiant.info/site/low-fat-green-smoothie/63