Practically every dieter knows that when it comes to dieting, there are foods that are good and those that aren't. Good foods for a diet will help you burn fat by turbo-charging your metabolism; bad foods, on the other hand, will make your body soft and flabby as well as turn it into a fat-storing machine.

Let's take a look at the 12 worst foods for a diet that you can possibly consume, so that you can make sure to steer clear of them…

1) One of the worst foods for a diet is margarine. It is very high in calories and also high in trans fats, which are the worst kind of fat you can consume.

2) White bread is next on the list of the 12 worst foods for a diet as it has been stripped of all that makes whole grain bread good. It raises your insulin levels and causes your body to store more fat; this is because it acts more like a simple sugar than a complex carbohydrate.

3) Third on the list are French fries as they contain lots of trans fats, and even carcinogens. Many health experts will tell you that French fries, even if consumed in moderation, are unhealthy and unsafe for the body.

4) Next on the list is processed cheese-one of the worst foods for a diet. Loaded with fat, salt, and calories, processed cheese has almost no nutritional value.

In fact, the law requires that most manufacturers of processed cheese label their products as "cheese food" or "cheese product."

5) Whole milk contains 3.7 percent fat and, per glass, has twice as many calories as skim milk. For the best results, opt for skim milk instead.

6) Bacon and sausages are also horrible foods for a diet. If you eat three slices of bacon, that's about 300 calories, most of which are from fat.

7) Cookies and crackers are among the worst foods for a diet that you can eat. Just like white bread, they are high in simple sugars that keep your blood sugar levels unbalanced and contribute to fat storage.

8) Also one of the bad foods for a diet is the high sugar breakfast cereals. Breakfast cereals that are good for you contain no sugar and are made from 100% whole grains; opt for these when looking for healthy breakfast cereals.

9) Commercial peanut butter is full of calories and very high in fat. It's fine to have natural peanut butter in moderation, but commercially available peanut butter that contains unhealthy additives like high fructose corn syrup and hydrogenated oils should be avoided.

10) Avoiding donuts should be a no-brainer. High in calories, fat, and sugar, these tasty numbers will only help you pack on the pounds; they are among the worst foods for a diet of any kind.

11) Drinking large portions of your caloric intake is never a wise idea, and soft drinks should be completely avoided when following a fat-loss program. Full of sugar and calories, soft drinks have no nutrient value.

12) Most of the calories in ice cream come from a combination of saturated fat and simple sugar, and you should know that ice cream dishes have a lot of calories. Ice cream is one of the worst foods for a diet because it also contains fillers, preservatives, and artificial flavorings.