Abstract
Purpose
To understand the effects of consuming high-fat and low-fat dairy products on postprandial cardiometabolic risk factors and intestinal immune function, we used an established low birthweight (LBW) swine model of diet-induced insulin resistance.
Methods
LBW piglets were randomized to consume one of the 3 experimental high fat diets and were fed for a total of 7 weeks: (1) Control high fat (LBW–CHF), (2) CHF diet supplemented with 3 servings of high-fat dairy (LBW–HFDairy) and (3) CHF diet supplemented with 3 servings of low-fat dairy (LBW–LFDairy). As comparison groups, normal birthweight (NBW) piglets were fed a CHF (NBW–CHF) or standard pig grower diet (NBW–Chow). At 11 weeks of age, all piglets underwent an established modified oral glucose and fat tolerance test. At 12 weeks of age, piglets were euthanized and ex vivo cytokine production by cells isolated from mesenteric lymph node (MLN) stimulated with mitogens was assessed.
Results
Dairy consumption did not modulate postprandial plasma lipid, inflammatory markers and glucose concentrations. A lower production of IL-2 and TNF-α after pokeweed mitogen (PWM) stimulation was observed in LBW–CHF vs NBW–Chow (P < 0.05), suggesting impaired MLN T cell function. While feeding high-fat dairy had minimal effects, feeding low-fat dairy significantly improved the production of IL-2 and TNF-α after PWM stimulation (P < 0.05).
Conclusions
Irrespective of fat content, dairy had a neutral effect on postprandial cardiometabolic risk factors. Low-fat dairy products improved intestinal T cell function to a greater extent than high-fat dairy in this swine model of obesity and insulin resistance.
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Change history
11 October 2023
A Correction to this paper has been published: https://doi.org/10.1007/s00394-023-03263-0
Abbreviations
- APC:
-
Antigen presenting cell
- AUC:
-
Area under curve
- CHF:
-
Control high-fat diet
- CI:
-
Confidence interval
- CV:
-
Coefficient of variation
- CVD:
-
Cardiovascular disease
- ELISA:
-
Enzyme-linked immunosorbent assay
- FSC:
-
Forward scatter
- GALT:
-
Gut-associated lymphoid tissue
- HFDairy:
-
High-fat dairy diet
- IEC:
-
Intestinal epithelial cells
- IFN-γ:
-
Interferon-gamma
- IL:
-
Interleukin
- LBW:
-
Low birthweight
- LDL-C:
-
Low-density lipoprotein cholesterol
- LFDairy:
-
Low-fat dairy diet
- LPS:
-
Lipopolysaccharide
- MFI:
-
Median florescence intensity
- MFGM:
-
Milk fat globular membrane
- MHC:
-
Major histocompatibility complex
- MLN:
-
Mesenteric lymph node
- MOGTT:
-
Modified oral glucose and fat tolerance test
- NBW:
-
Normal birthweight
- PBMC:
-
Peripheral blood mononuclear cell
- PBS:
-
Phosphate-buffered saline
- PC:
-
Phosphatidylcholine
- PMA-I:
-
Phorbol 12-myristate 13-acetate plus ionomycin
- PP:
-
Peyer's patches
- PWM:
-
Pokeweed mitogen
- SEM:
-
Standard error of the mean
- SM:
-
Sphingomyelin
- S–MCFA:
-
Short–medium chain fatty acid
- SRTC:
-
Swine research technology centre
- SSC:
-
Side scatter
- TC:
-
Total cholesterol
- TG:
-
Triglycerides
- Th:
-
T helper cell
- TLR-4:
-
Toll-like receptor 4
- TNF-α:
-
Tumor necrosis factor-alpha
- Treg:
-
T regulatory cell
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Acknowledgements
This study was supported by grants from Dairy Farmers of Canada (RES0042193) and the Natural Sciences and Engineering Research Council of Canada Discovery Grants to both CR and SDP. YS is a recipient of a Ph.D. scholarship from China Scholarship Council (201807980001).
Funding
Dairy Farmers of Canada (Grant No. RES0042193), Natural Sciences and Engineering Research Council of Canada (Grant No. RES0038933).
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CR and SDP designed and obtained funding for this study. ST and BPW provided expertise on immunology and animal model. YS, AM, RM and KW conducted research and analyzed data. YS performed the statistical analysis and wrote the manuscript under the supervision of CR and SDP. CR has primary responsibility for final content. All authors have read and approved the final manuscript.
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She, Y., Wang, K., Makarowski, A. et al. Low-fat dairy consumption improves intestinal immune function more than high-fat dairy in a diet-induced swine model of insulin resistance. Eur J Nutr 62, 699–711 (2023). https://doi.org/10.1007/s00394-022-03013-8
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DOI: https://doi.org/10.1007/s00394-022-03013-8