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J Am Coll Nutr. 2016;35(3):255-61. doi: 10.1080/07315724.2015.1022637. Epub 2015 Nov 23.

Dairy Consumption Lowers Systemic Inflammation and Liver Enzymes in Typically Low-Dairy Consumers with Clinical Characteristics of Metabolic Syndrome.

Author information

1
a Department of Nutritional Sciences , University of Connecticut , Storrs , Connecticut.

Abstract

OBJECTIVES:

A 6-week cross-over study design was used to determine the effect of increased dairy consumption in typically low-dairy consumers (n = 37) with metabolic syndrome (MetS) on systemic inflammation and hepatic enzymes.

METHODS:

This was a randomized study in which participants consumed low-fat dairy (LFD) (10 oz 1% milk, 6 oz nonfat yogurt, 4 oz 2% cheese) or a carbohydrate-based control (CNT) (1.5 oz granola bar and 12 oz 100% juice) for 6 weeks. After a 4-week washout, they were allocated to the alternate dietary treatment. Inflammatory status was assessed by fasting plasma concentrations of C-reactive protein (CRP), tumor necrosis factor alpha (TNF-α), and monocyte chemoattractant -1 (MCP-1). In addition, gene expression of interleukin (IL)-1, IL-6, and TNF-α was evaluated in peripheral blood mononuclear cells isolated from a subset of 17 subjects (13 women, 3 men) at the end of each dietary period. Liver enzymes were also assessed to evaluate whether dairy components would affect hepatic function.

RESULTS:

Participants had lower concentrations of both hepatic alanine aminotransferase (p < 0.05) and aspartate aminotransferase (p < 0.005) after the LFD period. No significant changes in any of the plasma inflammatory compounds were found when all data were analyzed together. In contrast, expression of IL-1b and IL-6 were reduced by 46% and 63%, respectively, compared to the control period. When stratified by gender, women had lower TNF-α, (p = 0.028) and MCP-1 (p = 0.001) following LFD consumption compared to CNT. In addition, hepatic steatosis index scores were significantly lower (p < 0.001) during the LFD period.

CONCLUSIONS:

We conclude that three dairy servings per day improved both liver function and systemic inflammation in subjects with MetS.

KEYWORDS:

dairy; hepatic enzymes; inflammation; metabolic syndrome

PMID:
26595359
DOI:
10.1080/07315724.2015.1022637
[Indexed for MEDLINE]

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