With a large majority of the population trying to slim down, it can be difficult for many to understand the idea behind bulking. However, for those who want to experience gains in muscle mass and size, eating the right foods to achieve this goal is critical. What foods are these? Well, the answer depends largely on what type of bulk you want to do.Clean Bulking. If you are clean bulking, which means that you want to limit the amount of fat you consume, then the foods you will want to eat include lean chicken, turkey, or steak; tuna and other fish; rice, pasta, and bread; fruits; cottage cheese and fat free milk. These are advised for people who have slower metabolisms and risk adding the extra calories as unnecessary weight.Regular Bulking. Regular bulking is similar to clean bulking, but it adds a few more food options to the mix to accommodate people with slightly higher metabolisms. Some of the additional foods are eggs, beans, peanut butter, and even pizza, as long as it isn’t too loaded with grease.Dirty Bulking. If you are blessed with a super high metabolism, then dirty bulking may be the way to go. In this case, fat is less important and you can pretty much eat whatever you want (think cheeseburgers, chicken nuggets, and cheese) as the only foods not recommended for this type of bulking are potato chips, sweetened juices, and the unhealthiest of the fast foods. This isn’t the best option for you if you are interested in bodybuilding though, as it won’t allow you to get a good enough cut. But if you tend to burn calories pretty fast and just want to increase your size, this is definitely an option to consider.So, which type of bulking do you do? And what kinds of foods do you find that help you gain in size without also gaining in fat?