Wanting to eat better is a goal that is shared by millions and millions of people around the globe. Their reasons range from "just wanting to" to trying to treat a deadly disease, from moral reasons to wanting to lose weight. Regardless of the reason, you should research health and nutrition before deciding on a healthy eating program that is best for you. Doing the proper research will not only point you in the right direction for foods you should eat, but it will also steer you away from the foods you should avoid.
One thing you need to watch out for is a lack of balance. For example, the market is filled with diet plans that eliminate whole categories of food. While it makes sense to reduce the level of saturated fat you consume, getting rid of carbohydrates is a questionable practice at best. It is okay to eat fat, carbohydrates and protein; in fact, you should be wary of any so-called healthy eating program that claims otherwise.
When it comes to fat, you will want to limit saturated fats, and try to eliminate man-made trans fats completely. (There are naturally occurring trans fats, and these aren't nearly as bad as their hydrogenated counterparts.) Your best bet is to have polyunsaturated and monounsaturated fats, though you don't want to go overboard on them, either.
Carbohydrates have received a lot of attention in recent years. This is due, largely, to some popular diets that avoided them. Yes, it is possible to lose weight on a low-carb diet, but there may be risks involved. Also, such a diet wouldn't really be considered a long-term healthy eating program because of the lack of balance. However, not all carbohydrates are created equally. You should limit the simple carbs found in white bread, white rice, and sugar; and replace them with the complex carbs found in whole grains, vegetables and some fruit.
Protein can be tricky because a lot of sources are high in saturated fat. Beef, for example, is high in protein, but a lot of cuts are high in saturated fat. Chicken, on the other hand, has some cuts that are higher in fat than others, so choose white meat to stay on the safe side. Perhaps the best of source of protein is beans (pinto, black, garbanzo, navy, and so on). The are high in protein and fiber, and are also very low in fat.
A healthy eating program doesn't mean you can never enjoy your favorite foods again, far from it. First, there are plenty of healthy alternatives for most foods. Second, the key is to enjoy such foods in moderation, as an occasional treat. If you eat less of the unhealthy foods, and more of the healthy foods, then you will be headed in the right direction. But if you can't have the foods you enjoy, then there is too great of a risk that you will simply go back to an unhealthy diet, and that wouldn't do you much good at all.