If you're looking to lose weight fast - then you can't afford to cheat on your diet and exercise routine with those foods that are high in sugar, fat, and carbs. Though many of us believe that some of the best-tasting foods are often the worst in terms of calories and fat, the truth is that if you want to lose weight, then you're going to need to make some sacrifices.

Although a standard diet and exercise regimen, complete with helpful compression garments can often be laced with the odd "cheat meal" or "sinful snack" - such things don't exist when speedy results are your ambition. Here, we'll outline the six most fattening foods you should never eat, when you're trying to slim down quickly.

1.    Soda

Not technically a food - but still a big deal for those who want to banish the extra inches from their waistline. Sugary soda is by far one of the most fattening things you can consume on a regular basis. Not only do these drinks lack any kind of essential nutrients, but they add a huge number of empty calories into your diet. Studies have shown that people who drink large amounts of soda are far more likely to gain weight than people who stick to water.

2.    Ice Cream

Everyone loves ice cream, but it's also one of the most fattening foods out there. Ice cream is full of fatty dairy and sugar, and since it's often eaten as a dessert - added onto a regular meal, it adds on a range of extra calories. If you enjoy ice-cream, then you can always eat it as an occasional treat. However, if you want to lose weight fat, then it's better to stick to desserts with less than 15 grams of sugar per serving. On the other hand, try a nice frozen yogurt or sorbet for a low-fat option.

3.    Takeaway Pizza

Pizzas that have been commercially prepared are by far one of the most popular junk foods in the world - particularly for kids and young adults. However, as tasty as a takeaway pizza may be - these treats contain huge amounts of refined carbs, fat, and calories. If that wasn't enough, some of the most popular toppings out there include huge amounts of fattening cheese and processed meat.

4.    Doughnuts and Cookies

Doughnuts and cookies contain large amounts of refined flour, sugar, and added fats. Although most sweet baked treats aren't great for your waistline, these two options are generally some of the worst offenders in terms of calories. If you want to keep your weight in check, then you're going to need to limit your intake as much as possible. In other words, try eating a single small cookie instead of an entire packet or a giant bakery creation.

5.    Commercially Processed Foods

Commercially processed foods like potato chips are brimming with saturated fats and other ingredients that are often considered to be semi-responsible for the obesity epidemic we're facing today. Though not all processed foods are necessarily bad, many are, and have been manufacturered to look and taste like minimally processed foods. Read the label before you buy or eat anything that could damage your dietary efforts.