NUTR 4320 FINAL PERSPECTIVES QUESTIONS WITH VERIFIED ACCURATE ANSWERS, Exams of Nutrition

NUTR 4320 FINAL PERSPECTIVES QUESTIONS WITH VERIFIED ACCURATE ANSWERS

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2025/2026

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NUTR 4320 FINAL PERSPECTIVES QUESTIONS WITH
VERIFIED ACCURATE ANSWERS
How many fold more genes does the microbiome have than there are human genes? -
Answers - 2000-fold
How are gene counts related to obesity severity? - Answers - Lower gene counts are
associated with greater obesity severity due to reduced microbial activity and function
What factors contribute to worse obesity in LGC individuals? - Answers - More
adiposity, insulin resistance, dyslipidemia, and inflammatory mediator production
What is characteristic of LGC microbiotas? - Answers - Low numbers of microbial genes
expressed indicates that the microbiome is less active and bacterial functions in the
microbiota are altered or lost compared to HGC individuals
What is characteristic of HGC microbiotas? - Answers - High numbers of microbial
genes expressed indicates a fully functional capability of the microbiota, exhibiting
redundancy in functions
What is IBD? - Answers - Chron's disease and/or ulcerative colitis resulting from
excessive inflammation of the colon causing tissue damage and loss of epithelial
membrane integrity
What are the symptoms common to IBD and IBs? - Answers - Abdominal
pain/cramping, diarrhea, nausea, vomiting, diminished appetite and weight loss
What is the FODMAP diet? - Answers - A diet that avoids fermentable foods,
oligosaccharides, disaccharides, monosaccharides, and polyols
What are the recommendations for use of the FODMAP diet? - Answers - Effective for
treatment of IBS, but only meant for short-term use in IBD
What is a potential negative impact of the FODMAP diet despite it reducing symptoms
of IBS? - Answers - No fiber or SCFA production that could increase remission time and
reduce inflammation
How is the microbiota affected in IBD? - Answers - Reduced abundance, diversity, gene
counts, and function within the microbiome -> microbial dysbiosis -> reduced butyrate
production
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NUTR 4320 FINAL PERSPECTIVES QUESTIONS WITH

VERIFIED ACCURATE ANSWERS

How many fold more genes does the microbiome have than there are human genes? - Answers - 2000 - fold How are gene counts related to obesity severity? - Answers - Lower gene counts are associated with greater obesity severity due to reduced microbial activity and function What factors contribute to worse obesity in LGC individuals? - Answers - More adiposity, insulin resistance, dyslipidemia, and inflammatory mediator production What is characteristic of LGC microbiotas? - Answers - Low numbers of microbial genes expressed indicates that the microbiome is less active and bacterial functions in the microbiota are altered or lost compared to HGC individuals What is characteristic of HGC microbiotas? - Answers - High numbers of microbial genes expressed indicates a fully functional capability of the microbiota, exhibiting redundancy in functions What is IBD? - Answers - Chron's disease and/or ulcerative colitis resulting from excessive inflammation of the colon causing tissue damage and loss of epithelial membrane integrity What are the symptoms common to IBD and IBs? - Answers - Abdominal pain/cramping, diarrhea, nausea, vomiting, diminished appetite and weight loss What is the FODMAP diet? - Answers - A diet that avoids fermentable foods, oligosaccharides, disaccharides, monosaccharides, and polyols What are the recommendations for use of the FODMAP diet? - Answers - Effective for treatment of IBS, but only meant for short-term use in IBD What is a potential negative impact of the FODMAP diet despite it reducing symptoms of IBS? - Answers - No fiber or SCFA production that could increase remission time and reduce inflammation How is the microbiota affected in IBD? - Answers - Reduced abundance, diversity, gene counts, and function within the microbiome - > microbial dysbiosis - > reduced butyrate production

How do SCFA enemas treat colitis in IBD? - Answers - Increase anti-inflammatory IL- 10 secretion and stimulate proliferation of normal colonic epithelial cells and apoptosis of damaged cells How is the abundance of sulfate-reducing bacteria different in IBD compared to healthy individuals? - Answers - Abundance of SRB increases in the colonic microbiota of IBD patients How do SRB affect the host? - Answers - 1. Produce H2S (several effects)

  1. Degrade mucus barrier by reducing disulfide bonds in the mucus network - > greater bacterial penetration and loss of mucus-associated bacteria What is bacteriodes thetaiotaomicron? - Answers - Commensal bacteria that stimulates goblet cell differentiation and mucin synthesis How does H2S impact host function? - Answers - 1. Stimulates NFkB (-> inflammatory cytokines - > epi barrier damage)
  2. Kills commensal bacteria (including SCFA producers)
  3. Inhibits butyrate oxidation and signaling in colonic epithelial cells (NOTE: TNF-alpha produced from host also does this) What are branched chain fatty acids (BCFA)? - Answers - Produced from fermentation of branched chain amino acids in protein How do BCFAs affect the host? - Answers - Increase secretion of inflammatory mediators (IL-6, MCP-1) from obese hypoxic adipocytes What are main examples of BCFAs? - Answers - Isovalerate, isobutyrate, caproate How does ammonia affect the host? - Answers - Decreased butyrate transporter (MCT, SMCT) and uptake by epithelial cells; decreases epithelial barrier integrity and function; causes DNA damage How do p-Cresol and Phenol (tyrosine metabolites) affect the host? - Answers - Damage DNA and alter cell cycle; promote transformed epithelial cell proliferation and decrease epithelial cell proliferation How do Indole and Skatole (tryptophan metabolites) affect the host? - Answers - Affect nervous system function and enhance neurodevelopment or psychiatric diseases? What are the beneficial effects of indole? - Answers - Decreased epithelial inflammation and improved epithelial barrier function How do carbohydrate fermentation metabolites combat the negative effects of protein fermentation metabolites? - Answers - 1. SCFA lower colonic pH - > inhibition of