Many people believe that cutting a sandwich diagonally to create two triangles is the best way, but there isn’t solid scientific evidence to support this theory.

One explanation is that the triangular shape allows for the first two bites to be taken from a 45-degree corner, which has crust on only one side, giving quicker access to the center of the sandwich where the filling is most concentrated.

After biting into the corner, it’s recommended to eat 1-3 bites diagonally. This part will have no crust, and depending on the sandwich size, you may end up with an additional small triangle.

While each triangle eventually becomes a single 90-degree crust piece, cutting a sandwich into rectangles would result in two crust corners on each half instead of one.

Another reason for cutting sandwiches into triangles is that they are easier to eat: only kids and cartoon characters tend to take their first bite from the middle, resulting in a messy eating experience.

Beginning at one of the corners allows for a cleaner eating experience, and the 45-degree angle of the triangle maximizes the depth of each bite.

For those who want to extend this concept further, the sandwich can be cut into four triangles and eaten in three separate sessions.

This strategy is commonly used at children’s parties, although children often do not eat the 45-degree corner first. In such cases, cutting off the crust altogether may be a better option.

This article is a response to the question “What is the best way to cut a sandwich, scientifically speaking?” (asked by Jeremy Fry of Felixstowe).

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