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|Title: ||Protein Quality and the Protein to Carbohydrate Ratio within a High Fat Diet Influences Energy Balance and the Gut Microbiota In C57BL/6J Mice|
|Authors: ||McAllan, Liam|
Cotter, Paul D.
O'Connor, Paula M.
Cryan, John F.
Ross, R Paul
Fitzgerald, Gerald F
Roche, Helen M.
Nilaweera, Kanishka N.
|Issue Date: ||10-Feb-2014|
|Citation: ||McAllan L, Skuse P, Cotter PD, Connor PO, Cryan JF, et al. (2014) Protein Quality and the Protein to Carbohydrate Ratio within a High Fat Diet Influences Energy Balance and the Gut Microbiota In C57BL/6J Mice. PLoS ONE 9(2): e88904. doi:10.1371/journal.pone.0088904|
|Series/Report no.: ||PLOS ONE;vol 9|
|Abstract: ||Macronutrient quality and composition are important determinants of energy balance and the gut microbiota. Here, we investigated how changes to protein quality (casein versus whey protein isolate; WPI) and the protein to carbohydrate (P/C) ratio within a high fat diet (HFD) impacts on these parameters. Mice were fed a low fat diet (10% kJ) or a high fat diet (HFD;
45% kJ) for 21 weeks with either casein (20% kJ, HFD) or WPI at 20%, 30% or 40% kJ. In comparison to casein, WPI at a similar energy content normalised energy intake, increased lean mass and caused a trend towards a reduction in fat mass (P = 0.08), but the protein challenge did not alter oxygen consumption or locomotor activity. WPI reduced HFD-induced plasma leptin and liver triacylglycerol, and partially attenuated the reduction in adipose FASN mRNA in HFD-fed mice. High throughput sequence-based analysis of faecal microbial populations revealed microbiota in the HFD-20% WPI group clustering closely with HFD controls, although WPI specifically increased Lactobacillaceae/Lactobacillus and decreased Clostridiaceae/Clostridium in HFD-fed mice. There was no effect of increasing the P/C ratio on energy intake, but the highest ratio reduced HFD-induced weight gain, fat mass and plasma triacylglycerol, non-esterified fatty acids, glucose and leptin levels, while it increased lean mass and oxygen consumption. Similar effects were observed on adipose mRNA expression,
where the highest ratio reduced HFD-associated expression of UCP-2, TNFa and CD68 and increased the diet-associated
expression of b3-AR, LPL, IR, IRS-1 and GLUT4. The P/C ratio also impacted on gut microbiota, with populations in the 30/
40% WPI groups clustering together and away from the 20% WPI group. Taken together, our data show that increasing the
P/C ratio has a dramatic effect on energy balance and the composition of gut microbiota, which is distinct from that caused by changes to protein quality.|
KN is supported by the Teagasc Vision Programme on Obesity, which also funded the work detailed in this manuscript. LM is supported by a Teagasc
PhD Walsh Fellowship. HMR is supported by SFI PI (11/PI/1119).
|Appears in Collections:||Food Biosciences|
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