Key takeaways
A new small study found that eating three servings of full-fat dairy a day didn’t lead to weight gain or worse cholesterol over 12 weeks.
Not all dairy is the same. Fermented options like yogurt and kefir may offer more benefits than butter or other dairy products.
Full-fat dairy can fit into a longevity-focused diet, but your overall diet and heart-health markers still matter.
People can argue about dairy until the cows come home, but a new study adds nuance to the dairy debate.
In the 12-week study, researchers gave 74 adults with overweight or obesity three daily servings of full-fat milk, yogurt, and cheese. By the end, the dairy eaters didn’t gain more weight or have worse markers for cholesterol, blood sugar, or insulin resistance than people eating less dairy. Dairy also added protein, calcium, and vitamin D, and some people had small improvements in blood pressure.
This is interesting, but it’s still a small study led by dairy industry researchers and not proof that it helps us live longer or protects our heart.
If you’ve spent the past few years wary of full-fat dairy, the study might seem suspect. So let’s explore what the science suggests, and whether full-fat dairy fits into a diet that supports healthy aging.
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Why did full-fat dairy get blacklisted?
Full-fat dairy carries a black mark in the heart space because it’s higher in saturated fat, which can raise LDL (‘bad’) cholesterol that can build up in arteries and contribute to heart disease.
This concern is why the American Heart Association recommends choosing low-fat or fat-free dairy and limiting whole-fat and full-fat milk, cheese, and cream (along with high-fat plant-based alternatives like coconut and palm oil). The specific advice is to keep saturated fats at or below 6% of total calories.
To add to the complexity, diets high in saturated fat can increase apoB (apolipoprotein B).
ApoB is a blood marker that helps estimate the number of cholesterol-carrying particles in circulation. No single food determines apoB, but cardiologists are paying more attention to it because 1) it may predict heart disease risk more than LDL alone, and 2) a higher apoB is linked to shorter lifespan, based on an important Lancet study.
Nutrition is not so black and white, though. To understand full-fat dairy, it helps to look beyond fat alone.
The food matrix: Beyond the individual food
“Dairy” is not a single food. Yogurt, butter, cheese, or cream might all start with milk, but they act differently because of the sum of interactions between individual nutrients, minerals, and compounds.
Scientists call this the ‘food matrix,’ and it can shape health more than any single nutrient, Mayo Clinic writes.
In this study, people eating more dairy got more calcium, vitamin D, and protein—nutrients that support bones and muscle. That matters as we get older because stronger muscles and bones can help us stay mobile and reduce fall risk.
But not every dairy product is nutritionally equal.
Butter is mostly dairy fat, lacking the healthy mix of protein, calcium, and good gut bugs that yogurt or cheese can provide. Compared to other full-fat dairy products, butter also contains relatively little milk fat globule membrane (MFGM), a compound researchers are studying to lower cholesterol.
Gut bugs are an important part of the matrix, as they could influence longevity beyond dairy itself:
A long-running observational study from Sweden found that fermented full-fat dairy was linked to a lower risk of dying, while very high intake of non-fermented dairy slightly increased that risk.
The live cultures in yogurt, kefir, and some cheeses seem to “counteract” the negative effects of saturated fat on blood lipids.
Eating fermented food also boosts populations of beneficial bacterial gut microbiome, and this may reduce systemic inflammation to support heart health.
And genetics might still have a role. ApoB—the heart-health biomarker—is heavily influenced by both genetics and the environment. Though this study shows that full-fat dairy doesn’t raise cholesterol or weight, people with genetically high ApoB (can be tested in a functional blood panel) are still encouraged to pay attention to how much saturated fat they eat.
“What do I eat now?”
Can dairy fit into a diet that supports aging? Yes… and maybe even the full-fat kind!
The practical advice is a middle ground:
Choose plain whole-milk yogurt or kefir (fermented dairy)
Use cheese as a condiment, not the main
For most people, full-fat dairy adds protein, nutrients, energy density, and staying power to your plate. It’s best built into a longevity-forward and heart-healthy Mediterranean- or DASH-style eating pattern that focuses on vegetables, legumes, fruit, whole grains, nuts, protein-rich foods, and unsaturated fats.
If your LDL cholesterol or apoB is elevated though—or if you have cardiovascular disease or a strong family history—it’s still worth considering guidance from a clinician or registered dietitian first.
Overall, nothing overrides the benefits of the eating pattern itself. Healthy eating, says Harvey Anderson, the lead study author and a professor of nutritional sciences, is just about moderation, diversity, and simplicity.
"Keep it simple, eat a variety of foods and not too much of anything."
What I’m reading next:
Israeli scientists engineered safflower plants to produce milk protein.
A ‘smart’ probiotic for diabetes is coming soon.
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Poll response
This question comes from last week’s newsletter: The science behind getting more from light weights.
We asked: What's your version of "I'm getting stronger?"
It was a split tie between lifting more + walking up stairs without the exhaustion. This lovely response might thread it all together: “I know I am getting stronger when I want to work out.” Consistency is often the best workout. Whether it’s weights, walking, or weaving between activities, finding a reason to want to move is the key.
Until next time!
Erin
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The information provided about wellness and health is for general informational and educational purposes only. We are not licensed medical professionals, and the content here should not be considered medical advice. Talk to a doctor before trying any of these suggestions.
