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I get a lot of questions about dairy.
Is it good? Is it bad? Does it cause inflammation? My mom always told me not to drink milk if I have a cold, does it actually increase mucus production? What about the hormones fed to cows that get into the milk? Is milk treated with antibiotics? I hate milk, can I just take a supplement? I'm lactose intolerant, are there ANY dairy products I can have? What kind of milk should I drink, skim 2% or whole?
Yikes! So many questions about milk, so let's start at the beginning. I'll leave the question of whether you should be drinking milk up to you, but let's me clear before I get started. I love milk and I drink it every single day. That being said, dairy products are not for everyone and here's why.
Lactose Intolerance--Most of the world's population is lactose intolerant, meaning they lack the enzyme lactase which is needed to break down lactose or milk sugar. Those of us with European descent however lucked out in the milk department because most of us can digest lactose, though figures range from 12-36% for adults in the US who are lactose intolerant. If you are lactose intolerant you'll definitely know it by the bloating, cramping and diarrhea you experience about 30 minutes after you consume too much lactose.
Does Dairy Cause Inflammation?--This assumption has been a major strike against dairy, but whether it is true or not is another story. Because dairy products contain saturated fat and saturated fat is known to increase inflammation, it has been assumed that dairy products cause inflammation. Compounding this assumption are the unpleasant symptoms people experience with a milk allergy or lactose intolerance. In a certain subset of people (those with allergies, intolerances, sibo, leaky gut, etc) dairy products can cause an increase in inflammatory markers.
In recent years, a plethora of research has focused on the inflammatory effects of dairy on the general population and, good news, the preponderance of evidence points towards a neutral or mildly anti-inflammatory effect from dairy products. In fact, a 2017 study which looked at the results of 52 studies concluded that dairy, particularly fermented products, have anti-inflammatory properties on those who don't have milk allergies.
Does the saturated fat in dairy products increase risk for heart disease?--There is so much interesting research coming out on this topic right now. First, it's important to understand that the term "saturated fat" encompasses a list of close to forty different fatty acids. So even though our food labels lump them all together and list grams of "saturated fat" there is actually quite a bit of variation within the fatty acids themselves. For example, dark chocolate contains a specific saturated fatty acid named stearic acid that does not raise blood cholesterol. However, it also contains palmitic acid, a saturated fatty acid which does raise cholesterol levels. Dairy is known to contain several saturated fatty acids which do not seem to impact cholesterol levels and some studies actually indicate that dairy decreases risk of heart disease. For example
this study
sumarized below:
Details: This review looked at evidence from 18 observational studies on the link between saturated fat intake from dairy products and risk of heart disease and death. The studies included more than 40,000 participants and measured blood levels of pentadecanoic acid and heptadecanoic acid, both of which are saturated fats found in dairy. Studies also measured levels of trans-palmitoleic acid, a type of trans fat found naturally in foods such as milk, cheese, and yogurt.
Results: Higher blood levels of pentadecanoic acid and heptadecanoic acid were linked to a lower risk of heart disease but not death. Blood levels of trans-palmitoleic acid were not associated with the risk of heart disease or death.
Conclusion: Consuming higher amounts of saturated fat from dairy may be associated with a reduced risk of heart disease.
Skim Milk vs Whole Milk?
So, while
there is mounting evidence to indicate that the fat in dairy actually has protective effects, increased intake of red meat, refined carbohydrates, and sugar are associated with greater incidence of heart disease.
Bottom Line:--Dairy products are a great source of calcium, vitamin D, vitamin A and protein for relatively few calories, plus, they taste great. So, if you like them, eat them!
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