Probiotics

A controlled, double-blind, randomized study on the efficacy of Lactobacillus plantarum 299V in patients with irritable bowel syndrome.
http://journals.lww.com/eurojgh/Abstract/2001/10000/A_controlled,_double_blind,_randomized_study_on.4.aspx

Obesity-associated gut microbiota is enriched in Lactobacillus reuteri and depleted in Bifidobacterium animalis and Methanobrevibacter smithii.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3374072/

High polyphenol, low probiotic diet for weight loss because of intestinal microbiota interaction.
http://www.sciencedirect.com/science/journal/00092797

Consuming probiotics promotes weight loss, reduces BMI
https://www.sciencedaily.com/releases/2016/07/160711092643.htm

Digestive Enzyme

Pancreatic α-Amylase Controls Glucose Assimilation by Duodenal Retrieval through N-Glycan-specific Binding, Endocytosis, and Degradation.
http://www.ncbi.nlm.nih.gov/pubmed/26023238