If you are trying to lose some weight, get a better figure, or just eat healthier in general, Healthy Meal Plans from Weight Watchers, Nutri-System, and all the rest will give you an opportunity to find what you need to hit your goal. Whether you are diabetic, vegetarian, looking for a protein diet, or low carbs, there are a number of plans you can choose from.
Most people tend to get into trouble when they go back for seconds. Finishing off your hunger is not necessarily bad for your health, but most people will have a second helping of dessert to fill the void, instead of getting a second serving of veggies or protein. Portion control isn't always a concern for some people either. If you are a very active athlete, you might get enough exercise to burn off those extra calories, but the average person does not have a lifestyle that will make up for undisciplined portion control.