BACKGROUND: Relatively high serum carotenoid levels are associated with reduced risks of chronic diseases, but inter-individual variability in serum carotenoid concentrations is modestly explained by diet. The bacterial community in the colon could contribute to the bioaccessibility of carotenoids by completing digestion of plant cells walls and by modulating intestinal permeability. OBJECTIVE: To evaluate whether colonic bacterial composition is associated with serum and colon carotenoid concentrations. DESIGN: The study was a randomized dietary intervention trial in healthy individuals who were at increased risk of colon cancer. Colon mucosal biopsy samples were obtained before and after 6 months of intervention without prior preparation of the bowels. PARTICIPANTS/ SETTING:Participants were recruited from Ann Arbor, MI, and nearby areas from July 2007 to November 2010. Biopsy data were available from 88 participants at baseline and 82 participants after 6 months. METHODS: Study participants were randomized to counseling for either a Mediterranean diet or a Healthy Eating diet for 6 months. RESULTS: At baseline, bacterial communities in biopsy samples from study participants in the highest vs the lowest tertile of total serum carotenoid levels differed by several parameters. Linear discriminant analysis effect size identified 11 operational taxonomic units that were significantly associated with higher serum carotenoid levels. In linear regression analyses, three of these accounted for an additional 12% of the variance in serum total carotenoid concentrations after including body mass index, smoking, and dietary intakes in the model. These factors together explained 36% of the inter-individual variance in serum total carotenoid concentrations. The bacterial community in the colonic mucosa, however, was resistant to change after dietary intervention with either a Mediterranean diet or Healthy Eating diet, each of which doubled fruit and vegetable intakes. CONCLUSIONS: The colonic mucosal bacterial community was associated with serum carotenoid concentrations at baseline but was not appreciably changed by dietary intervention.
RCT Entities:
BACKGROUND: Relatively high serum carotenoid levels are associated with reduced risks of chronic diseases, but inter-individual variability in serum carotenoid concentrations is modestly explained by diet. The bacterial community in the colon could contribute to the bioaccessibility of carotenoids by completing digestion of plant cells walls and by modulating intestinal permeability. OBJECTIVE: To evaluate whether colonic bacterial composition is associated with serum and colon carotenoid concentrations. DESIGN: The study was a randomized dietary intervention trial in healthy individuals who were at increased risk of colon cancer. Colon mucosal biopsy samples were obtained before and after 6 months of intervention without prior preparation of the bowels. PARTICIPANTS/ SETTING:Participants were recruited from Ann Arbor, MI, and nearby areas from July 2007 to November 2010. Biopsy data were available from 88 participants at baseline and 82 participants after 6 months. METHODS: Study participants were randomized to counseling for either a Mediterranean diet or a Healthy Eating diet for 6 months. RESULTS: At baseline, bacterial communities in biopsy samples from study participants in the highest vs the lowest tertile of total serum carotenoid levels differed by several parameters. Linear discriminant analysis effect size identified 11 operational taxonomic units that were significantly associated with higher serum carotenoid levels. In linear regression analyses, three of these accounted for an additional 12% of the variance in serum total carotenoid concentrations after including body mass index, smoking, and dietary intakes in the model. These factors together explained 36% of the inter-individual variance in serum total carotenoid concentrations. The bacterial community in the colonic mucosa, however, was resistant to change after dietary intervention with either a Mediterranean diet or Healthy Eating diet, each of which doubled fruit and vegetable intakes. CONCLUSIONS: The colonic mucosal bacterial community was associated with serum carotenoid concentrations at baseline but was not appreciably changed by dietary intervention.
Authors: Gary D Wu; Jun Chen; Christian Hoffmann; Kyle Bittinger; Ying-Yu Chen; Sue A Keilbaugh; Meenakshi Bewtra; Dan Knights; William A Walters; Rob Knight; Rohini Sinha; Erin Gilroy; Kernika Gupta; Robert Baldassano; Lisa Nessel; Hongzhe Li; Frederic D Bushman; James D Lewis Journal: Science Date: 2011-09-01 Impact factor: 47.728
Authors: Lena K Brahe; Emmanuelle Le Chatelier; Edi Prifti; Nicolas Pons; Sean Kennedy; Trine Blædel; Janet Håkansson; Trine Kastrup Dalsgaard; Torben Hansen; Oluf Pedersen; Arne Astrup; S Dusko Ehrlich; Lesli H Larsen Journal: Br J Nutr Date: 2015-07-02 Impact factor: 3.718
Authors: Laura E Griffin; Zora Djuric; Chris J Angiletta; Cassie M Mitchell; Mary E Baugh; Kevin P Davy; Andrew P Neilson Journal: Food Funct Date: 2019-04-02 Impact factor: 5.396
Authors: Giuseppe Merra; Annalisa Noce; Giulia Marrone; Marco Cintoni; Maria Grazia Tarsitano; Annunziata Capacci; Antonino De Lorenzo Journal: Nutrients Date: 2020-12-22 Impact factor: 5.717