COW’S MILK IS
a great source of several nutrients that support growth, such a
protein
, calcium,
zinc
, and vitamins like A and D. It’s a big part of the reason you parents might have been so pushy about with getting you to drink enough of the stuff as a kid.
You’ve seen the billboard ads of athletes like Serena Williams and Carmelo Anthony talking about how milk can help you build strong bones. And, you might have heard rumors that milk can even help you grow taller.
“There’s also some evidence that drinking milk may help
increase your levels of IGF-1
—a hormone that helps determine how tall you’ll be,” says
Kim Yawitz
, R.D., a registered dietitian and gym owner in St. Louis. “In theory, drinking milk
during adolescence
could help you come closer to your genetic height potential.”
But, drinking more milk as an adult won’t help you grow taller. We explain why, below.
Can drinking milk make you taller?
YOU ALREADY KNOW
that drinking milk can help you build strong bones and
muscles
.
That’s because
cow’s milk
—yes, not almond milk or oat milk or soy milk—is naturally high in calcium, a nutrient that promotes bone density, and protein, which contributes to muscle growth. (
One cup
of milk contains 293 milligrams of calcium and about 8 grams of protein, for reference.)
Your parents
didn’t just make this up out of nowhere. Scientists have actually studied this hypothesis. And
dietitians
do hear similar questions from their clients.
“There are actually several published studies showing that, in children, drinking milk is associated with very small increases in height,” says
Kelly Jones M.S., R.D., C.S.S.D.
It is important to recognize, however, that these studies are showing a correlation and
not
a cause and effect relationship. And that just because a few research reports have found a positive association doesn’t mean that there’s proof milk can make you taller.
And, honestly, the research is mixed.
One 2018 study
followed a group of participants from birth, through 17 years, and discovered that height increased by 0.39 centimeters per self-reported additional 8 ounces of milk consumed daily. Jones: “However, the authors also noted that the population was mostly of moderate income and reasonably well educated, which can mean results would not be similar in populations with worse access to food or knowledge of appropriate eating patterns.”
Plus, there are other factors that may influence the results. “In some of the studies showing a correlation between milk intake and height, other factors may not have been considered, such as overall diet quality, including adequate intake of protein, calcium,
vitamin D
, and other nutrients,” she says.
Then there’s a 2019
systematic review
, which stated that adding dairy products to person’s diet was associated with increased bone mineral content during childhood, but there was no correlation between dairy and height.
And then there’s
a 2020 study
published in the journal
Nature
that found that milk consumption was associated with increased weight-for-age and height-for-age in children and reduced the probabilities of being moderately or severely underweight or stunted—but also the effect was dependent upon geographic location and income level.
So, in short, it’s complicated.
“It may also be that those who do not drink milk are consuming
sugar-sweetened
beverages, such as soft drinks, which may impair bone health (with bone health being important for reaching appropriate peak height),” Jones says
Plus, all this research was done on children. So if you’re looking to gain height as an adult, you may have missed your window.
Should you still drink milk?
IT DEPENDS ON
your nutrition needs, but generally, yes.
Obviously if you have severe lactose intolerance, you can keep milk off your list. If you don’t, though, milk still offers a ton of beneficial nutrients. Milk one of the few consistent sources of calcium, which we know is important for bone health.
“Additionally, many do not consume adequate
fatty fish
, one of the few natural sources of vitamin D, and milk can provide that as well,” she says.
Plus, milk protein is known to be very beneficial for muscle growth and repair, so, go ahead, enjoy it in
your post-workout shake
.
What are other health benefits of milk?
AS LONG AS
you aren’t
lactose intolerant
, drinking milk may be a net positive for your health. Besides supporting strong bones and healthy muscles, here are a few more potential health perks of drinking milk.
“
Milk contains whey—a protein that helps prevent blood sugar spikes by signaling the pancreas to release more insulin,” says Yawitz. Studies suggest that drinking low-fat milk daily could help reduce the risk of type 2 diabetes
by up to 10 percent
.
Milk is also a good source of
magnesium
and
protein
, two nutrients linked with a lower risk of depressive symptoms in adults. “
In a recent study
involving nearly 18,000 adults, those who drank the most milk were 39 percent less likely to experience depressive symptoms than those who drank little to no milk,” says Yawitz. (Of course, other unknown variables beyond drinking milk could have been at play in these findings.)
Also, per Yawitz, there may be some truth to those rumors that a glass of warm milk before bed will
help you sleep better
. “Milk contains tryptophan, an amino acid that the body can use to make more melatonin,” she says. “The proteins in milk can also help you sleep more soundly by keeping your blood sugar levels stable overnight.”
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