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Home » Is Organic Milk Better For You?

Is Organic Milk Better For You?

By Marybeth Feutz 10 Comments

What do you think? Is organic milk really that different from conventional milk? Is it better for you? Let’s start by taking a look at the nutrition label. (Review these tips on how to read a nutrition label.)

is organic milk better for you than conventional milk?



Calories Fat (grams) Sugars Protein Vit D (% DV) Calcium (% DV)
Conventional Whole Milk (Prairie Farms) 150 8 11 8 25 30
Organic Whole Milk (Horizon) 150 8 11 8 25 30

So, on the surface, there is no difference between the major nutrients in conventionally-raised milk and organically-raised milk. But what about that study that was in the news about the fatty acids?

Fatty acids in milk

A study published in PLOS One in December 2013 found that organic milk had less omega-6 fatty acids and more omega-3 fatty acids than conventional milk. Current research suggests that you want an ratio of omega 6:3 of around 2.3 in your diet, to help to decrease the risk of cardiovascular disease. Most people have a much higher ratio than that (so more omega 6, and less omega 3). The researchers for this article looked at some hypothetical diets for women aged 19-30 to see how a switch to organic dairy (which they found to have a lower omega 6:3 ratio) would change their overall fatty acid intake. They found that – with these hypothetical diets – switching to organic milk had about the same effect on overall fatty acid profiles as increasing consumption of conventional milk. But switching to foods lower in omega 6 fatty acids helped to change the ratio for the better. And the fatty acid content of milk can change with the season and with the cow’s diet. So, it turns out that switching to organic milk isn’t the magic bullet that will keep your heart healthy.

But what about hormones? Aren’t there hormones in conventional milk, but not in organic milk?

Hormones in milk

All milk contains hormones. Some conventional dairy farms do give their cows growth hormone (bovine somatotropin, BST, or rBST). This hormone increases milk production. But many dairy farmers have chosen to not give their cows this hormone, primarily due to market pressure from consumers. Check the label on the gallon of milk in your refrigerator. I’ll bet that even if it is “regular” milk, you’ll find a label that says “from cows not treated with rBST”. And a disclaimer that says “According to the FDA, no significant difference has been shown between milk derived from rBST treated and non-rBST treated cows.” Organic dairy farmers are not allowed to give their cows rBST.

there is no biological difference in the amount of hormones in milk from a cow treated with rBST or a cow not treated with rBST

So what about the hormone levels in the milk itself? Aren’t they different? According to a study published in the Journal of the Academy of Nutrition and Dietetics in 2008, they are a little different. But not in the way you might expect – conventional milk actually had less estradiol (a type of estrogen) and progesterone than organic milk. But the differences were so small, even though there is a statistical difference there really isn’t a biological difference.

Estradiol (pg/mL) Progesterone (ng/mL)
Conventional milk 4.97 12.0
Organic milk 6.40 13.9

Let’s try to put this into perspective. A pg is a picogram, or 1 trillionth of a gram. A ng is a nanogram, or 1 billionth of a gram. But what in the world does that mean? Here is a great graphic that helps to explain exactly how much hormone is in a few different foods, using M&Ms as a visual aid.

Now let’s do a little bit of math. The table above talks about hormones in terms of per milliliter. There are 236 milliliters in 1 cup. So if you were to drink 1 cup of conventional milk, that is 1176 picograms of estrogen, or 1.2 nanograms. In organic milk, there are 1.5 nanograms of estrogen in 1 cup. In the M&M example, the sliver of a M&M in a pint jar represents 0.85 nanograms in 3 ounces of beef. To extend the example to our milk, the conventional milk pint jar would have a little bigger sliver of M&M, and the organic milk pint jar would have about a half an M&M. Now look at the cabbage jar, on the far left. That jar is full! The average person has 13 full pint jars of M&Ms in their body, and the average pregnant lady has 178 pint jars of M&Ms (representing estrogen, of course) in their body.

So, really, is the difference between 1/4 and 1/2 of an M&M inside a pint jar that big? It certainly isn’t a big enough difference to make a biological difference to your body.

Okay. So let’s say you’re still with me through the math and the M&M reference. But what about antibiotics? Aren’t there antibiotics in conventional milk?

Antibiotics in milk

Nope. There are no antibiotics in milk. Period. On a conventional dairy farm, farmers can treat sick cows with antibiotics, under the direction of a veterinarian. These cows are separated from the regular herd, and their milk is discarded until they reach the end of the withdrawl period for the antibiotic. (The withdrawl period is the length of time that an antibiotic is secreted in the milk. Once the withdrawl period is over, there is no longer any detectable level of antibiotic in the milk.) On an organic dairy farm, the farmers are not allowed to use antibiotics to treat their cows.

Every time a tank of milk is picked up from a dairy farm, that milk is tested for antibiotics. Every single time. And it must test negative in order for the milk to be processed and get to the grocery store. If there are antibiotics found in the milk, the entire tanker of milk is dumped out, and the farmer is fined. If a farmer is found to have antibiotics in his milk too many times, the milk processor will stop accepting his milk.

So, what do you think? My family drinks conventional milk. I’ll be giving conventional milk to my son when he turns one. If you choose to drink organic milk, that’s a great decision for you and your family. I’ll respect your choice if you respect mine.

For more articles about dairy farming and milk production, check out this list.

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Filed Under: Where is My Food From? Tagged With: antibiotic, comparison, dairy, food, hormone, milk, nutrition, organic milk

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Comments

  1. Deb McKee Kelly says

    07/03/2014 at 1:27 pm

    What about the difference between grass-fed and grain-fed cows? I have seen research that shows that cows fed grass tend to have much higher Omega 3s and CLAs. I don’t focus so much anymore on the “organic” label (because even most organic dairy and meat comes from cows fed grain), but I am trying to purchase dairy and meat from farmers who feed their cattle primarily grass. It costs more, but I believe it is better for us (and better for the bovines).

  2. AgriCultured says

    07/03/2014 at 1:53 pm

    Deb, You are right, cows with a high proportion of grass in their diet do tend to produce milk with a higher omega 3 content. Lactating takes a lot of energy and calories, so a grass-only diet is usually not sufficient to give the cow all the calories she needs to stay healthy, maintain her body weight, and make milk all at the same time. This is why most (if not all) dairy cows are fed some type of grain in their diet. Dairy farms do have cattle nutritionists that visit their farms on a regular basis (often more than once a month) to assess the cow’s feed and to be sure that it is nutritionally balanced to provide everything they need. (See this post for more information: http://agricultured.org/feeding-dairy-cows/).

    Can I ask why you think feeding only grass is better for the cows (and for people consuming the milk and meat)? Just curious.

  3. Deb McKee Kelly says

    07/03/2014 at 3:57 pm

    I think I was given that impression from one of our local dairies here (full disclosure: I used to volunteer my time at the dairy) — Traders Point Creamery — http://www.tpforganics.com/about-us/why-grassfed/ But I am definitely not an extremist, and we are hydroponic veggie growers, so I can fully appreciate the need to give the animal (or plant) exactly the nutrition it requires. I have read that cows need primarily a grass diet because their rumens don’t process grain as well. But I also know it is natural for cows to eat some grain. 🙂

  4. Dani Vello says

    07/07/2014 at 9:38 am

    Awesome! Thank you and sharing this one all over the place. 🙂

  5. Dr. Marybeth Feutz says

    07/07/2014 at 10:10 am

    Thanks for your comment, Deb. Cows do need a lot of roughage in their diet (like grass, hay, or silage). If all they eat is grain, their metabolism gets very messed up and they get very sick. Even “grain-fed” beef has a lot of grass or hay in their diet. But, as I mentioned above, and as you know, grass or hay alone does not always provide all the nutrition that a cow needs to grow, build muscle, and make milk. I’ve talked about how a cow’s rumen works before, you can find those posts here:

    http://agricultured.org/cows-are-ruminants/
    http://agricultured.org/rumination-is-not-just-for-thinking/

    Thanks for visiting, and for the conversation!

  6. Dr. Marybeth Feutz says

    07/07/2014 at 10:10 am

    I’m glad you found it helpful!

  7. Beth says

    08/16/2017 at 8:47 am

    Do you have any updated research about conventional milk being lower in estrogen than organic milk? I think all the milk now has the label about no growth hormones but it’s difficult finding information about estrogen. Thank you!

  8. Marybeth Feutz says

    08/30/2017 at 4:17 pm

    Thanks for asking, Beth. Here is the abstract from a 2010 article in the Journal of Dairy Science. They did not find any difference in the amount of estrogen in conventional milk and organic milk. The amounts of estrogen in cow’s milk is extremely small compared to what people make themselves every day.

    https://www.ncbi.nlm.nih.gov/pubmed/20494161

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