Does dairy actually lower inflammation, or just not raise it?
The strongest evidence suggests dairy either reduces inflammation or has no effect—it does not make it worse. A 2022 meta-analysis of 14 clinical trials (15 study arms) found that fermented dairy products—yogurt, fermented milk, and kefir—lowered C-reactive protein (CRP) by an average effect size of -0.21 (a small but statistically meaningful reduction) [1]. CRP is a widely used blood marker of systemic inflammation. The same analysis found no significant effect on other inflammatory markers like tumor necrosis factor-alpha (TNF-α) or interleukin-6 (IL-6), meaning dairy did not raise them [1].
In a 2016 crossover study of 37 adults with metabolic syndrome who typically ate little dairy, adding three servings of low-fat dairy per day for six weeks reduced expression of the inflammatory genes IL-1β by 46% and IL-6 by 63% in immune cells, compared to a carbohydrate-based control diet [2]. Women in that study also had lower blood levels of TNF-α and MCP-1 (another inflammatory signal) after the dairy period [2]. These are large, clinically meaningful drops in inflammation at the cellular level.
Why do some people think dairy causes inflammation?
The idea that dairy is inflammatory often comes from two sources: individual sensitivities and studies on acne. A 2025 review of diet and skin conditions noted that high-glycemic foods and dairy—especially skim milk—may worsen acne in some people by influencing insulin and hormone pathways that increase sebum production and inflammation [5]. However, this is a skin-specific effect, not a sign of general systemic inflammation. The same review found that reducing dairy helped some acne patients but had less clear effects on rosacea [5].
For the general population, large, well-controlled trials show no adverse effect. A 2014 randomized crossover study of 112 healthy adults with low-grade inflammation (CRP >1 mg/L) found that eating three servings of dairy per day for four weeks did not raise CRP, IL-6, or any other inflammatory marker compared to an energy-matched control diet [3]. In fact, both diets lowered IL-6 by about 19%, and the dairy diet did not blunt that benefit [3]. A 2010 study in 35 overweight adults also found that low-fat dairy had no effect on IL-6 or adhesion molecules, and actually improved the TNF-α index (a ratio that reflects inflammatory activity) [6].
Does the type of dairy or the person matter?
Yes, the type of dairy and the person's health status influence the effect. The anti-inflammatory benefit appears strongest for fermented dairy (yogurt, kefir) and in people with metabolic issues. In the 2022 meta-analysis, the CRP-lowering effect was most pronounced in participants with metabolic diseases (like obesity or prediabetes), and the increase in the anti-inflammatory marker interferon-gamma (IFN-γ) was seen with yogurt specifically and in interventions lasting 12 weeks or longer [1].
Animal research supports this pattern. A 2025 mouse study of sarcopenia (muscle wasting) found that all dairy products—goat milk, bovine milk, low-fat, and fortified versions—significantly lowered inflammation markers including CRP, IL-1β, IL-6, and TNF-α in muscle tissue [4]. The fortified low-fat goat milk was most effective at reducing inflammation and improving muscle regeneration [4]. This suggests that dairy's anti-inflammatory effects may be especially relevant for conditions involving chronic low-grade inflammation, such as metabolic syndrome, aging, or muscle loss.
Sources used in this answer
Effects of fermented dairy products on inflammatory biomarkers: A meta-analysis
Meta-analysis of 14 trials found fermented dairy products lowered CRP by a small but significant amount (SMD = -0.21) and increased IFN-γ, with no effect on other inflammatory markers.
Dairy Consumption Lowers Systemic Inflammation and Liver Enzymes in Typically Low-Dairy Consumers with Clinical Characteristics of Metabolic Syndrome.
In 37 low-dairy consumers with metabolic syndrome, 3 servings/day of low-fat dairy for 6 weeks reduced IL-1β gene expression by 46% and IL-6 by 63% in immune cells, and lowered TNF-α and MCP-1 in women.
Dairy product consumption has no impact on biomarkers of inflammation among men and women with low-grade systemic inflammation.
In 112 adults with low-grade inflammation, 4 weeks of 3 dairy servings/day did not raise CRP, IL-6, or other inflammatory markers compared to a control diet; both diets similarly lowered IL-6 by ~19%.
Four Dairy Products Mitigates Sarcopenia in Mice by Modulating Muscle Inflammation, Autophagy, and Protein Degradation
In sarcopenic mice, all dairy products (goat, bovine, low-fat, fortified) significantly lowered muscle inflammation markers CRP, IL-1β, IL-6, and TNF-α, with fortified low-fat goat milk being most effective.
Evaluating the efficacy of dietary interventions on skin health: a comparative review of outcomes in acne and rosacea
Review of diet and skin conditions found that high-GI foods and dairy (especially skim milk) may worsen acne in some people via insulin/hormone pathways, but this is skin-specific and not systemic inflammation.
Effects of low-fat dairy consumption on markers of low-grade systemic inflammation and endothelial function in overweight and obese subjects: an intervention study.
In 35 overweight adults, 8 weeks of low-fat dairy (500 mL milk + 150 g yogurt daily) had no effect on IL-6 or adhesion molecules, but improved the TNF-α index (TNF-α:s-TNFR-2 ratio decreased).