Home / G. Health and nutrition / Part IND

"Milk is necessary for your bones."

Before answering: an indirect argument

This argument is about health and nutrition, not whether animals deserve respect. Many activists question this kind of argument in defending animals, because it sidesteps what matters: no one defends the rights of people who face discrimination by saying that treating them fairly is good for the environment.

Why it is not good to use it, or why always to pair it with an ethical argument: If veganism were defended on health grounds, anyone who manages to be healthy eating animals, and many people do, would have no reason to change. And if an animal product turned out to be demonstrably healthier, the same argument would start defending exploitation. The eater's health says nothing about whether what is done to the animal is just.

When used to justify exploitation, arguments like this one usually fail twice. They get the facts wrong, which often arrive distorted. And they get the morality wrong, because they leap from what is to what ought to be: even a real benefit would not show it is just to make someone suffer and die to obtain it.

So show the facts and correct what is wrong, but always come back to what matters: respect for animals and justice toward them. Learn why

The answer in one sentence

we need calcium, not milk. Calcium is found in dark green vegetables such as kale and broccoli, in tofu made with calcium salts, in fortified plant drinks, in sesame and in legumes. About two thirds of the world's adults lose the ability to digest lactose well, and billions of people live without dairy. Strong bones also depend on vitamin D, physical activity and not smoking.

Short answer

We need calcium, not milk. Calcium is found in kale, broccoli, tofu made with calcium salts, fortified plant drinks, sesame and beans. About two thirds of the world's adults digest lactose poorly. And bone health also depends on vitamin D, physical activity and not smoking. Milk is one source of calcium, not the only one.

For children

Calcium helps make bones strong. It's in milk, but also in kale, broccoli, tofu, sesame and plant milks with added calcium. Playing, running and getting some sun also help your bones a lot.

Ask a question back

"If calcium exists in vegetables and fortified foods, is the need for calcium or for cow's milk?"

Como pode aparecer

"Milk makes bones strong."

Everyday conversation

"You'll get osteoporosis."

Everyday conversation

"Children need milk."

Everyday conversation

"Without milk, your bones turn to dust."

Social media

"Dairy is the main source of bioavailable calcium."

Technical version

"Cows need to be milked." (which is C10)

Disguised version

The strongest version

How it is said

"Milk makes bones strong. You'll get osteoporosis. Children need milk."

Strongest version (steelman):

P1Calcium is essential for bone health.
P2Milk is a rich, well-absorbed source of calcium.
P3Without milk, it's hard to reach the recommended amount of calcium.
CSo milk is necessary for bone health.

P1 and P2 are true. The problem lies in P3: there are many plant and fortified sources of calcium, and the need is for the nutrient, not the food.

The argument is valid. Its soundness fails at P3.

Full answer

Reconstruction and diagnosis

The argument confuses the nutrient with the source:

What bones need	Possible sources
Calcium	Milk, but also kale, broccoli, calcium-set tofu, fortified plant drinks, sesame, almonds, beans
Vitamin D	Sunlight, fortified foods, supplements
Mechanical load	Physical activity
Adequate protein	Legumes and other sources

b
Where the argument breaks
1. Calcium exists outside milk.
Low-oxalate dark green vegetables, such as kale and bok choy, have well-absorbed calcium. Tofu made with calcium salts and fortified plant drinks provide amounts similar to milk.
2. Most of the world's adults don't digest lactose well.
About 65% to 70% of adults lose lactase, the enzyme that digests milk sugar; keeping it into adulthood is a trait of some populations. Billions of people live without dairy.
3. Bones depend on more than calcium.
Vitamin D, physical activity, adequate protein and not smoking are important factors for bone health.
4. Nutrition bodies consider the diet adequate.
With planned calcium sources, vegan diets meet requirements.

Data and sources

Source	What it says	Note
Harvard T. H. Chan School of Public Health, calcium	Lists non-dairy calcium sources, such as calcium-set tofu, fortified drinks, kale and bok choy, and explains that spinach has low absorption because of oxalates	A reference page on nutrition
Academy of Nutrition and Dietetics, 2016	Well-planned vegan diets, with calcium sources, are adequate	Official position
Tong and colleagues, 2020, BMC Medicine	In EPIC-Oxford, vegans had a higher risk of fractures than meat eaters, especially hip fractures	The authors point to lower calcium and protein intake and lower body weight as possible factors
Misselwitz and colleagues, 2017, review on lactase	About 65% to 70% of the world's adults don't retain lactase	A review in Current Gastroenterology Reports

d
The strongest counter-reply: vegans may take in too little calcium
The most serious version cites a real finding: in the large British EPIC-Oxford study (2020), vegans had more fractures than meat eaters, especially hip fractures. On average, they also weighed less and took in less calcium and protein. And it's easy to fall below the recommended amount without planning calcium sources.
e
Why the counter-reply doesn't reach the conclusion
The finding calls for attention, not milk.
The authors themselves link the risk to low calcium and protein intake, which can be corrected with plant and fortified sources, vitamin D and physical activity. But it's a point that deserves care and shouldn't be minimized.
The risk points to planning.
Information about calcium sources solves most of the problem.
The moral question remains.
Even if calcium were easier to get from milk, that wouldn't justify what milk production does to cows and calves (C10).
f
Back to the moral question
Milk isn't necessary for the bones of those with access to other calcium sources. And milk production involves repeated pregnancies, separating calves and slaughtering cows. If there are other ways to get calcium, the question is whether that cost to the animals is justified.

Reasoning errors

Logical

Is the form valid?

Confusing nutrient and source

"We need calcium" becomes "we need milk"

Epistemological

Does the evidence support it?

Not knowing calcium sources

Ignores vegetables and fortified foods

Moral

Is the criterion coherent?

Invented necessity

Uses a need that has alternatives to justify harm

Biases

Rationalization through the 4Ns

"Necessary"

Piazza et al., 2015

Familiarity

Decades of advertising tie milk to strong bones

General literature on the mere-exposure effect

Extrapolations

The principle being tested is: "if a food is a source of a nutrient, it's necessary".

If it applied to…OrangesTap to see

They'd be necessary for vitamin C

There are many other sources

If it applied to…FishTap to see

It would be necessary for omega-3

This is the argument of G6

If it applied to…MilkTap to see

It would be necessary for calcium

The error is the same

Contradictions

Knows many people are lactose intolerant.

And live well without milk.

Doesn't drink milk from other species.

Cow's milk is a cultural choice.

Doesn't think adults of other mammals need milk.

Adult cows don't drink it.

What the argument gets right

What is true

Calcium is essential, and milk is indeed a rich source of it. Whoever gives up dairy needs to learn about alternative sources, and studies show that very low calcium intakes increase risks. This is a legitimate concern.

But

But what bones need is calcium, vitamin D and movement, not cow's milk. With plant and fortified sources, bones do fine, and so do cows.

Connections

Usually comes before

B7 Milk and eggs don't kill anyone.Shifts to necessity

C10 Cows need to be milked.Claims milk is necessary

G5this argument

Usually comes after

C10 Cows need to be milked.From milk as a necessity to milk as a favor to the cow

"Milk is necessary for your bones."

Short answer

For children

Como pode aparecer

The strongest version

Full answer

Reconstruction and diagnosis

Where the argument breaks

Data and sources

The strongest counter-reply: vegans may take in too little calcium

Why the counter-reply doesn't reach the conclusion

Back to the moral question

Reasoning errors

Logical

Epistemological

Moral

Biases

Rationalization through the 4Ns

Familiarity

Extrapolations

Contradictions

What the argument gets right

Connections

References

Nutrition

Psychology