A composition comprising viable, live bacteria strains (i), intermediate metabolites, (ii) end metabolites (iii) and a dispersing medium (iv), characterized in that said bacteria strains (i) being present in a total concentration of over 10 9 bacteria per ml composition; and said bacteria strains (i) having a viability of over 70% as determined by flow cytometry; and said bacteria strains (i) being selected from: ▪ strains consuming sugars, fibers, and resistant starch, producing formate and acetate, and ▪ strains consuming sugars, starch and acetate, producing formate and butyrate, and ▪ strains consuming sugars and oxygen, producing lactate, and ▪ strains consuming sugars, starch, and carbon dioxide, producing lactate, formate and acetate, and ▪ strains consuming lactate or proteins, producing propionate and acetate, and ▪ strains consuming lactate and starch, producing acetate, butyrate and hydrogen, and ▪ strains consuming sugar, starch, formate producing lactate, formate and acetate, and ▪ strains consuming succinate, producing propionate and acetate, and ▪ strains consuming sugars, fibers, formate and hydrogen, producing acetate and butyrate; said intermediate metabolites (ii) being selected from: ▪ succinate in an amount of less than 5 mM, and ▪ formate in an amount of less than 5 mM, and ▪ lactate in an amount of less than 5 mM; and said end metabolites (iii) being selected from ▪ acetate in an amount of at least 10 mM, and ▪ propionate in an amount of at least 2 mM, and ▪ butyrate in an amount of at least 2 mM; and said dispersing medium (iv) preferably being selected from: ▪ culture media, or ▪ cryoprotecting media, or ▪ aqueous gels, or ▪ polymeric supports; wherein bacteria strains (i) of all nine groups to are present, and ▪ being selected from the genus Ruminococcus, ▪ being selected from the genus Faecalibacterium, ▪ being selected from the genus Lactobacillus, ▪ being selected from the genus Bifidobacterium, ▪ being selected from the genus Clostridium, ▪ being selected from the genus Eubacterium, ▪ being selected from the genus Collinsella, ▪ being selected from the genus Phascolarctobacterium, and ▪ being selected from the genus Blautia; in each case identified through classification of the full 16S gene with assignment for the different taxonomic levels Phylum: 75%, Class: 78.5%, Order: 82%, Family: 86.5%, Genus: 94.5%, sequence similarity. ▪ strains consuming sugars, fibers, and resistant starch, producing formate and acetate, and ▪ strains consuming sugars, starch and acetate, producing formate and butyrate, and ▪ strains consuming sugars and oxygen, producing lactate, and ▪ strains consuming sugars, starch, and carbon dioxide, producing lactate, formate and acetate, and ▪ strains consuming lactate or proteins, producing propionate and acetate, and ▪ strains consuming lactate and starch, producing acetate, butyrate and hydrogen, and ▪ strains consuming sugar, starch, formate producing lactate, formate and acetate, and ▪ strains consuming succinate, producing propionate and acetate, and ▪ strains consuming sugars, fibers, formate and hydrogen, producing acetate and butyrate; ▪ succinate in an amount of less than 5 mM, and ▪ formate in an amount of less than 5 mM, and ▪ lactate in an amount of less than 5 mM; and said end metabolites (iii) being selected from ▪ acetate in an amount of at least 10 mM, and ▪ propionate in an amount of at least 2 mM, and ▪ butyrate in an amount of at least 2 mM; and ▪ culture media, or ▪ cryoprotecting media, or ▪ aqueous gels, or ▪ polymeric supports; wherein bacteria strains (i) of all nine groups to are present, and ▪ being selected from the genus Ruminococcus, ▪ being selected from the genus Faecalibacterium, ▪ being selected from the genus Lactobacillus, ▪ being selected from the genus Bifidobacterium, ▪ being selected from the genus Clostridium, ▪ being selected from the genus Eubacterium, ▪ being selected from the genus Collinsella, ▪ being selected from the genus Phascolarctobacterium, and ▪ being selected from the genus Blautia; in each case identified through classification of the full 16S gene with assignment for the different taxonomic levels Phylum: 75%, Class: 78.5%, Order: 82%, Family: 86.5%, Genus: 94.5%, sequence similarity.