“Coffee stunts a child's growth.”

The notion that coffee or caffeine can hinder a child's growth is a widespread misconception, but it lacks scientific backing. This enduring myth largely originated from a clever, yet misleading, advertising campaign for Postum, a grain-based coffee alternative, in the late 19th and early 20th centuries. C.W. Post, the founder of Postum, actively promoted his caffeine-free product by running advertisements that vilified coffee, attributing various health problems, including stunted growth and impaired development in children, to its consumption. These pervasive ads successfully embedded the idea into public consciousness, despite their pseudoscientific nature.

In reality, scientific evidence does not support the claim that coffee or caffeine directly stunts growth. Pediatric endocrinologists confirm that caffeine does not meaningfully impact a child's height. A person's ultimate height is predominantly determined by genetic factors, along with adequate nutrition and overall health. While some older research suggested a minor impact of caffeine on calcium absorption, this effect is negligible and easily offset by a balanced diet, for example, with the calcium in a small amount of milk.

The persistence of this myth can be attributed to several factors. Beyond the historical advertising campaigns that shaped public opinion, the general caution surrounding stimulant consumption in children likely contributed. Parents, understandably concerned about their children's well-being, may have adopted this belief as a "better safe than sorry" approach. Furthermore, the association between caffeine and potential sleep disruption, which is crucial for development, might be misinterpreted as a direct stunting of growth. However, while excessive caffeine can affect sleep and lead to other issues like anxiety or upset stomachs, it does not directly prevent a child from reaching their genetically determined height.