Coffee does not stunt growth

Why the myth sticks around

Coffee can seem like a plausible culprit because caffeine affects the body in ways that matter for growing kids. It can reduce sleep quality, and it can also get in the way of eating enough nutritious food. The American Academy of Pediatrics says a child’s body and brain are more sensitive to caffeine, and it lists sleep loss, anxiety, jitteriness, and stomach upset among the common effects. ³⁶

The calcium angle also helped fuel the myth. NIH’s calcium fact sheet says caffeine modestly reduces calcium absorption and increases calcium loss a little, but it also notes that in a varied diet those effects may have little or no nutritional consequence. In other words, caffeine is not a growth hormone blocker; at typical intake levels, the calcium effect is small. ⁸

What actually determines height

The main drivers of height are not coffee. MedlinePlus Genetics says height is controlled largely by genes, with a smaller contribution from environmental factors such as nutrition, and AAP guidance on short stature says that not getting enough calories, protein, or other nutrients can slow growth over time. Chronic illness, hormonal problems, and overall health matter much more than whether a child drinks coffee. ⁴⁵

That is why pediatricians look at a child’s growth pattern over time, not at a single food or drink. If a child is growing slowly, the usual question is whether they are getting enough calories and protein, whether they have a chronic medical condition, and whether puberty or hormone timing is normal. Coffee is not a standard cause of short stature in pediatric growth evaluations. ⁴⁵

What coffee can actually do to kids

Coffee is not harmless for children just because it does not stunt height. CDC says children younger than 24 months should avoid caffeinated drinks, and it says there is no established safe limit for caffeine for young children. FDA also says too much caffeine in children and teens can cause rapid heartbeat, anxiety, sleep problems, digestive problems, and dehydration. ²⁶

For older kids and teens, the bigger concern is often what caffeine displaces. The AAP says caffeine can get in the way of nutrients that help kids grow because children may eat less of the foods they need after filling up on caffeinated drinks or ultra-processed caffeine products. That is a nutrition and sleep problem, not evidence that coffee directly prevents normal height gain. ³

When coffee might matter indirectly

Coffee can matter indirectly if it becomes part of a pattern that reduces a child’s overall calorie intake, displaces milk or meals, or chronically cuts into sleep. In that situation, slower growth would be due to the broader pattern, not a magical “stunting” effect from coffee itself. The Guatemalan toddler trial is a good example: growth differences showed up in children with higher coffee intake and iron deficiency, which is exactly the kind of setting where food intake and nutrition can be the real issue. ⁷⁸

So the practical takeaway is simple: coffee is not a cause of short stature, but caffeine can still be a poor fit for children because of its effects on sleep, appetite, and behavior. If a child is not growing as expected, the right next step is a medical review of nutrition, family height pattern, and possible health conditions. ³⁴⁵⁶