Does Coffee Stunt Your Growth? Blame a 1900s Ad
Quick Answer
No. Does coffee stunt your growth? There is no credible evidence that it does, and pediatric endocrinologist Roy Kim, MD, at Cleveland Clinic states plainly that caffeine does not meaningfully change how tall a child becomes . The claim traces back to advertising for Postum, a caffeine-free roasted-grain drink launched in 1895 by C.W. Post, which sold itself by telling American parents that coffee ruined children. Your height is set mostly by genetics, nutrition, and sleep. Not by your flat white.
Key Takeaways
- No study has ever linked coffee to reduced adult height. Cleveland Clinic's review quotes pediatric endocrinologist Roy Kim, MD, saying there is no scientific medical evidence behind the claim .
- The myth is marketing. Postum launched in 1895 and its ads cast coffee as a cause of nervousness, poor schoolwork, and impaired development.
- A 1901 Postum advertorial in the Boston Daily Globe reportedly called giving coffee to children "a crime" and said it "stunts their growth." That sentence is ad copy, not a clinical finding.
- A 2023 study published in PLOS ONE combining observational data and Mendelian randomization found no significant bone mineral density differences in the highest caffeine group and no causal link in children and adolescents.
- A longitudinal study following American white females from ages 12 to 18 found no significant differences in total-body bone mineral gain between caffeine intake groups.
- Caffeine's effect on calcium is small. McGill University's Office for Science and Society notes the modest calcium loss from a cup of coffee is roughly offset by about a tablespoon of milk .
- The real concerns for kids and teens are sleep, anxiety, and heart symptoms, not stature. The AACAP advises against caffeine for children , and Yale Medicine has flagged caffeine's effect on teen sleep .
Does coffee stunt your growth?
No. Does coffee stunt your growth in any measurable way? Researchers have looked, and the answer that keeps coming back is no. Adult height is determined largely by genetics, childhood nutrition, sleep, hormone levels, and general health. Caffeine is not on that list.
The confusion comes from a chain of reasoning that sounds plausible and falls apart under pressure:
- Caffeine causes a small increase in calcium excreted in urine.
- Calcium builds bone.
- Bones determine height.
- So coffee must make you shorter.
Step one is true and tiny. Steps two and three are true but incomplete. Step four never followed from any of them. Height stops increasing when the growth plates in your long bones fuse, and that process is controlled by hormones, mainly growth hormone and sex steroids . Nobody has shown a coffee effect on growth plate closure.
The misconception, stated plainly: people believe a 1901 advertising slogan is a medical finding. It is not. It was written to sell a grain beverage.
Where did the coffee stunt growth myth come from?
It came from a competitor. C.W. Post introduced Postum in 1895 as a caffeine-free roasted-grain alternative to coffee, and his advertising strategy was to make coffee look dangerous, especially to children. Smithsonian Magazine's account describes Postum ads portraying coffee as a cause of irritability, sleeplessness, poor school performance, and impaired development.
Post was unusually good at this. His copy read like health journalism. Some pieces ran as advertorials, laid out like news columns, with the sort of confident medical tone that made parents nod. The strategy worked so well that the phrasing outlived the product in most American kitchens.
A sister argument appeared in 1933 campaign language: coffee displaced milk in children's diets, leaving them undernourished and poorly developed. That half has a kernel of sense in it. A child who drinks a mug of sweetened coffee instead of milk gets less calcium, protein, and vitamin D. But the ad took a reasonable nutrition point and bolted an unsupported causal claim onto it, which is how the postum advertising line became a permanent piece of American folklore.
What did that 1900s ad actually say about coffee?
The most cited example is a Postum advertisement in the Boston Daily Globe in 1901. Per reporting by The New York Times' Wirecutter, it called giving coffee to children "a crime," said it prepared them for "dyspepsia and nervous wrecks," and stated flatly that coffee "stunts their growth."
"It stunts their growth." That line was written by a copywriter selling a grain drink, not by a physician reporting a result.
Later campaigns kept the same register. The 1933 wording tied coffee to failures of "proper development and growth." No measurements. No control group. No follow-up. Just assertion, repeated in national newspapers for decades until it stopped sounding like an ad and started sounding like common knowledge.
Is there any scientific evidence that caffeine and height are linked?
No study has found that caffeine and height are causally linked. The research that exists mostly measures bone, not stature, and it does not support the myth either.
Here is what has actually been examined:
PLOS ONE, 2023 (observational plus Mendelian randomization). Researchers compared caffeine consumption with bone mineral density at the femoral neck, total femur, and spine. The highest-consumption group showed no significant BMD differences. The Mendelian randomization arm, which uses genetic variants to test causality rather than correlation, found no causal relationship between caffeine and total-body BMD in children and adolescents. Limitation: the authors still called for longer-term research, and Mendelian randomization assumes the chosen genetic variants influence outcomes only through caffeine.
Journal of the American College of Nutrition, longitudinal adolescent study. This followed American white females from age 12 to age 18 and found no significant differences between caffeine-intake groups in total-body bone mineral gain or hip bone density at 18. Limitations: one sex, one ethnic group, self-reported intake, and it measured bone accrual rather than final adult height.
Clinical review, Cleveland Clinic. Pediatric endocrinologist Roy Kim, MD, states there is no scientific medical evidence that coffee or caffeine stunts growth . WebMD's review reaches the same conclusion , as does McGill University's Office for Science and Society .
None of this is a treatment claim or a health endorsement. It is an absence of evidence for a specific accusation, and that absence is now over a century old.
Does caffeine affect bone development in children?
Only marginally, and the effect is small enough that a splash of milk cancels it. Caffeine slightly increases urinary calcium excretion. That is the entire mechanism behind the caffeine calcium absorption worry.
McGill's Office for Science and Society notes the calcium lost to a cup of coffee is roughly offset by adding about a tablespoon of milk . If your teenager takes a latte, the milk in it covers the loss several times over. The weak associations found in some older observational studies involving caffeine and lower bone density were generally in populations with low calcium intake overall, which points at the diet, not the drink.
Decision rule: if a young person drinks coffee, serve it with milk and keep total daily calcium adequate. That removes the only mechanism the myth ever had.
How much coffee would actually stunt growth?
There is no amount shown to reduce adult height, so no threshold exists to quote. Someone would first have to demonstrate the effect before anyone could measure a dose.
What does have thresholds is caffeine safety. The relevant limits look like this:
| Drink | Typical caffeine | Growth evidence |
|---|---|---|
| Brewed coffee, 8 oz | About 95 mg | None linking it to height |
| Black tea, 8 oz | About 47 mg | None linking it to height |
| Cola, 12 oz | About 34 mg | None linking it to height |
| Energy drink, 16 oz | Roughly 160 mg and up | No height link; other risks flagged |
| Decaf coffee, 8 oz | Around 2 to 5 mg | None |
Caffeine figures are standard USDA-range values and vary by brew strength, grind size, and brew ratio. If the decaf number surprises you, we broke down exactly how much caffeine decaf coffee contains.
Edge case worth naming: very large daily caffeine doses in a growing teenager can wreck sleep, and deep sleep is when most growth hormone is released. That is an indirect, plausible, and unproven pathway. It is also a good reason to care about bedtime rather than about coffee specifically.
Does coffee stunt growth in teenagers versus young kids?
Does coffee stunt your growth differently at 8 than at 16? No, in both cases the height claim fails. But the practical advice differs, because smaller bodies feel caffeine harder and younger children have no reason to drink it at all.
The American Academy of Child and Adolescent Psychiatry advises that children avoid caffeine, noting effects on sleep, anxiety, and concentration . Most pediatric guidance treats roughly 12 as the age where a small, occasional caffeinated drink becomes a reasonable family decision rather than a problem, and coffee for teenagers is usually discussed in terms of a cap around 100 mg a day, about one standard cup.
Yale Medicine has reported on how caffeine is reshaping teen sleep, which is the measurable harm worth your attention . A student drinking a 16 oz energy drink at 4 p.m. may still be wired at 11 p.m. That costs schoolwork, mood, and rest.
If you want a milder entry point for a curious teen, a milk-forward drink works well. The difference between a macchiato and a latte is mostly milk volume, and more milk means less caffeine per sip.
A note for families: if a child has a diagnosed heart condition, an anxiety disorder, or is taking medication, ask their doctor about caffeine before making it routine. That is a conversation with real stakes, unlike the height question.
What do pediatricians say about kids and coffee?
They say caffeine is unnecessary for children, and they say the growth claim is false. Those two statements sit together comfortably.
Roy Kim, MD, at Cleveland Clinic rejects the height claim outright while still recommending that children skip caffeine . The reasoning is practical:
- Sleep disruption, which matters more in growing bodies.
- Increased anxiety and jitteriness.
- Heart rate and blood pressure effects.
- Caffeinated drinks are often sugary and displace milk or water.
- Dependence and withdrawal headaches in regular young users.
Clinicians in 2026 are far more focused on concentrated stimulant products than on a cup of drip. School districts across several states have restricted energy drinks and caffeine pouches on campus this school year, and an American Heart Association analysis of FDA adverse-event reports from 2017 to 2025 found caffeinated energy drinks and stimulant supplements disproportionately represented in serious cardiovascular reports among young adults. Association, not proof of cause, but it explains where professional attention has moved.
Do tea and other caffeinated drinks have the same effect?
No, because there is no effect to share. Tea, cola, energy drinks, chocolate, and coffee all deliver caffeine, and none of them has been shown to reduce adult height.
Tea carries roughly half the caffeine of coffee per cup and historically escaped the myth entirely, which is itself a clue. Nobody ran a national campaign telling parents tea would shrink their children. Coffee got singled out because coffee had a commercial rival with an advertising budget.
Energy drinks are the genuine outlier, not for height but for dose. A single large can can exceed a teenager's sensible daily limit on its own, and the stimulant blends in some products make total caffeine hard to count. The FDA added caffeine labeling to its 2026 regulatory priority list partly because current rules do not consistently require a total caffeine figure on the label.
Why do people still believe coffee stunts growth?
Because the claim is old, simple, memorable, and attached to parental authority. Most adults heard it from someone who loved them.
Three forces keep it alive:
- Repetition beats evidence. Postum ran versions of the message for decades. Once a line enters family speech, correcting it requires an argument, while repeating it requires nothing.
- It sounds biologically reasonable. Bones, calcium, stimulants. The story has a plausible shape even though the pieces never connected.
- It is useful. "It will stunt your growth" ends a negotiation with an eleven-year-old faster than "caffeine may delay your sleep onset and reduce slow-wave sleep." Parents keep the version that works.
Student journalism has started pushing back directly, with one 2026 school publication running a piece arguing coffee has been wrongfully blamed . That is roughly a 125-year delay on a correction.
Can drinking coffee as an adult make you shorter?
No. Adult height is fixed once the growth plates fuse, typically in the mid to late teens, and coffee cannot reverse that. Nothing you brew will subtract inches.
The height loss people notice in later decades comes from spinal disc compression and, in some cases, osteoporosis. Osteoporosis risk is driven by age, sex, hormones, genetics, body weight, smoking, alcohol, physical activity, and calcium and vitamin D intake. Moderate coffee drinking does not appear on the list of established causes .
Practical version: if you drink several cups daily and worry about bone health, take calcium and vitamin D seriously, keep weight-bearing exercise in your week, and discuss a bone density scan with your doctor if you have risk factors. Then enjoy your pour over.
Is this myth completely false, or is something to it?
The height claim is false. One adjacent concern is legitimate, and it is the one the 1933 ad happened to stumble into.
| What was claimed | Verdict |
|---|---|
| Coffee makes children shorter | False. No evidence |
| Caffeine wrecks bone density | Not supported. Small calcium effect, offset by milk |
| Coffee can displace milk in a child's diet | Reasonable, if coffee replaces calcium-rich drinks |
| Caffeine disrupts teen sleep | Supported, and sleep matters for development |
So the honest answer is that a century-old ad got the right instinct about children and caffeine for entirely the wrong reason, and then sold a grain beverage on the strength of it.
Daily caffeine checker
Caffeine values are typical averages and vary by brew strength. Height is not affected by any of these totals. Limits shown reflect commonly cited guidance, not medical advice.
“+msg; };
FAQ
Conclusion
Does coffee stunt your growth? No, and the sentence that convinced three generations of American parents was written to sell a roasted-grain drink in 1901. Your height came from your parents, your childhood diet, and your sleep. Your coffee habit is a separate question with separate answers.
What this means for your daily cup: drink it. If you have a teenager in the house, the useful conversation is about sleep timing and energy drinks, not inches.
Next step: if you want more control over what actually lands in the cup, start with how many scoops of coffee to use per cup, then tighten your brew ratio from there. Better Coffee Starts With Better Answers.
Related reading: is one cup of coffee per day good for you and does coffee dehydrate you, what the research says.
