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Jefferson Adams posted an article in Obesity, Overweight & Celiac DiseaseCeliac.com 08/18/2014 - A team of researchers recently set out to better understand the effects of gluten-free diets on obesity. The research team included F.L. Soares, R. Matoso de Oliveira, L.G. Teixeira, Z. Menezes, S.S. Pereira, A.C. Alves, N.V. Batista, A.M. de Faria, D.C. Cara, A.V. Ferreira, and J.I. Alvarez-Leite. They are affiliated with the Departamento de Alimentos, Faculdade de Farmácia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais in Belo Horizonte, Brazil. Specifically, the team wanted to determine whether a gluten-free diet can prevent the expansion of adipose tissue, and its consequences. For their study, the team fed C57BL/6 mice a high-fat diet containing either 4.5% gluten (Control) or no gluten (gluten-free). They noted body weight and adiposity gains, leukocyte rolling and adhesion, macrophage infiltration and cytokine production in adipose tissue. The team measured blood lipid profiles, glycaemia, insulin resistance and adipokines. They also assessed the expression of the PPAR-α and γ, lipoprotein lipase (LPL), hormone sensitive lipase (HSL), carnitine palmitoyl acyltransferase-1 (CPT-1), insulin receptor, GLUT-4 and adipokines in epidydimal fat. Gluten-free animals showed less body weight and adipose gain, with no changes in food intake or lipid excretion. These results were associated with up-regulation of PPAR-α, LPL, HSL and CPT-1, which are related to lipolysis and fatty acid oxidation. The team also saw improved glucose regulation, and pro-inflammatory profile-related over-expression of PPAR-γ. Intravital microscopy revealed a lower number of adhered cells in the adipose tissue microvasculature. The over-expression of PPAR-γ is related to the increase of adiponectin and GLUT-4. The results of this study suggest that gluten-free diets can be helpful in reducing fat gain, inflammation and insulin resistance. They suggest that a gluten-free diet should be tested as a way of preventing the development of obesity and metabolic disorders. Source: J Nutr Biochem. 2013 Jun;24(6):1105-11. doi: 10.1016/j.jnutbio.2012.08.009. Epub 2012 Dec 17.
Celiac.com 09/23/2013 - Patients with non-celiac gluten sensitivity (NCGS) do not have celiac disease, but see an improvement in symptoms when they adopt gluten-free diets. A team of researchers recently investigated the specific effects of gluten after dietary reduction of fermentable, poorly absorbed, short-chain carbohydrates (fermentable, oligo-, di-, monosaccharides, and polyols [FODMAPs]) in patients with suspected NCGS. The research team included Jessica R. Biesiekierski, Simone L. Peters, Evan D. Newnham, Ourania Rosella, Jane G. Muir, and Peter R. Gibson. The team performed a double-blind cross-over trial of 37 subjects (aged 24−61 y, 6 men) with NCGS and irritable bowel syndrome (based on Rome III criteria), but not celiac disease. They assigned study participants randomly to groups given a 2-week diet of reduced FODMAPs, and were then placed on high-gluten (16 g gluten/d), low-gluten (2 g gluten/d and 14 g whey protein/d), or control (16 g whey protein/d) diets for 1 week, followed by a washout period of at least 2 weeks. The researchers then evaluated serum and fecal markers of intestinal inflammation/injury and immune activation, and indices of fatigue. The team then crossed twenty-two participants over to groups receiving gluten (16 g/d), whey (16 g/d), or control (no additional protein) diets for 3 days, using visual analogue scales to evaluate symptoms. They found that gastrointestinal symptoms consistently and significantly improved for all patients during reduced FODMAP intake, but significantly worsened to a similar degree when their diets included gluten or whey protein. The team saw gluten-specific effects in just 8% of study subjects. They saw no diet-specific changes in any biomarker. During the 3-day re-challenge, participants’ symptoms increased by similar levels among groups. Gluten-specific gastrointestinal effects were not reproduced. An order effect was observed. A placebo-controlled, cross-over re-challenge study showed no evidence of specific or dose-dependent effects of gluten in patients with NCGS placed diets low in FODMAPs. Source: Gastroenterology, Volume 145, Issue 2, Pages 320-328.e3, August 2013. More info on the FODMAP diet from Stanford Univerisity.