Analysis of topics related to gut microbiota health, diet and nutrition. An introduction to the gut microbiota and its acquisition; How the microbiome is studied; Techniques for analyzing microbiome data; Gut microbiome changes in obesity and associated comorbidities: liver disease, insulin resistance and diabetes; Links between the microbiota, intestinal immune system and adipose tissue immune system; Effects of diet on the gut microbiota; Potential of the gut microbiome in treating obesity and related diseases.