Subway is fast food chain in the US that serves submarine type of sandwiches, salads, side orders, desserts, breakfasts and also pizzas. Customers have the liberty to choose a range of bread types, vegetables and condiments that they wanted added in their sandwiches. Every single sandwich at a Subway fast food restaurant is made by hand as per the customer's likes and based on the nutrition information that the customer has. Usually, Subway nutrition information is available on the menu for every single food item.

A typical Subway sandwich is 6-inch long made up of 9-grain wheat bread, tomatoes, lettuce, onions, green peppers, cucumbers and cheese. The most fat is present in a tuna sub contain 30 gm of fat, whereas the plain veggie sub contains the least amount of fat with 2.5 gm. The veggie sub also has the least amount of calories, which is 30 calories. The highest calorie count is in the meatball marinara sub and big pastrami sub which have 580 calories.

Usually adding veggies to a sub does not alter the overall nutritional value of the sandwich as the Subway nutrition information states that most of the veggies used in the sandwiches have less than 5 calories. However, it is the condiments that are added to the subs can have a profound effect on the calories that a person consumes. For instance, if a person adds mayonnaise to the sub, then he or she is getting 110 calories and 12 gm fat just from the mayonnaise. The other condiments to enhance the taste of a sub include bacon, red wine vinaigrette, chipotle southwest sauce, sweet onion sauce, olive oil blend, honey mustard sauce, pepperoni, ranch dressing and mustard (brown or yellow). These condiments can affect the overall calorie and fat content of a Subway sandwich significantly.

Subway has 9 kinds of breads that are used to make the sandwiches. They include parmesan oregano bread, honey oat bread, Italian herbs and cheese bread, Italian bread, 9-grain wheat bread, flat bread, hearty Italian bread, Monterrey cheddar bread, and roasted garlic bread. Even the bread can have an effect on the calories present in a sandwich. The calories in the different breads range from 200 to 260 calories.