In the late 19th and early 20th centuries, breakfast became associated with fueling the body, a concept promoted by cereal magnates like John Harvey Kellogg, per The Guardian.

Kellogg believed that eating the "correct" foods could help to ward off temptation and impurity. Conveniently, his own cornflake cereal served as the perfect food for this purpose.

Once the discovery of vitamins entered the mix, cereal advertisers continued to use moralizing marketing ploys to convince working-class mothers to buy nutrient-rich cereals.

This only cemented breakfast's place as the most important meal in the cultural eye, as it was viewed as a quick and easy source of essential vitamins.

However, when it comes down to it, though the morning is a great opportunity to start your day with a nutritious breakfast, it's not inherently the most important meal of the day.