A recombinant microorganism characterized by: a) having phosphoketolase activity; b) (i) having a diminished or inactivated Embden-Meyerhof-Parnas pathway (EMPP) by inactivation of the gene(s) encoding phosphofructokinase or by being genetically modified so as to reduce phosphofructokinase activity as compared to a non-genetically modified microorganism; or (ii) not possessing phosphofructokinase activity; and c) (i) having a diminished or inactivated oxidative branch of the pentose phosphate pathway by inactivation of the gene(s) encoding glucose-6-phosphate dehydrogenase or by being genetically modified so as to reduce glucose-6-phosphate dehydrogenase activity as compared to a non- genetically modified microorganism; or (ii) not possessing glucose-6-phosphate dehydrogenase activity; and d) furthermore characterized in that the activity of one or more of the enzymes selected from the group consisting of: - formate C-acetyltransferase, classified as EC 2.3.1.54; - acetate kinase, classified as EC 2.7.2.1 - L-lactate dehydrogenase, classified as EC 1.1.1.28 - phosphoenolpyruvate carboxylase, classified as EC 4.1.1.31 - phosphoenolpyruvate carboxykinase, classified as EC 4.1.1.49 - succinate dehydrogenase, classified as EC 1.3.99.1 - pyruvate decarboxylase, classified as EC 4.1.1.1 - acetaldehyde dehydrogenase (acetylating), classified as EC 1.2.1.10 - glycerol-3-phosphate dehydrogenase [NAD +], classified as EC 1.1.1.94 - acetolactate synthase, classified as EC 2.2.1.6 - methylglyoxal synthase, classified as EC 4.2.3.3 - formate hydrogenlyase, classified as EC 1.2.1.2 together with EC 1.12.1.2 is eliminated or reduced. a) having phosphoketolase activity; b) (i) having a diminished or inactivated Embden-Meyerhof-Parnas pathway (EMPP) by inactivation of the gene(s) encoding phosphofructokinase or by being genetically modified so as to reduce phosphofructokinase activity as compared to a non-genetically modified microorganism; or (ii) not possessing phosphofructokinase activity; and (i) having a diminished or inactivated Embden-Meyerhof-Parnas pathway (EMPP) by inactivation of the gene(s) encoding phosphofructokinase or by being genetically modified so as to reduce phosphofructokinase activity as compared to a non-genetically modified microorganism; or (ii) not possessing phosphofructokinase activity; c) (i) having a diminished or inactivated oxidative branch of the pentose phosphate pathway by inactivation of the gene(s) encoding glucose-6-phosphate dehydrogenase or by being genetically modified so as to reduce glucose-6-phosphate dehydrogenase activity as compared to a non- genetically modified microorganism; or (ii) not possessing glucose-6-phosphate dehydrogenase activity; and (i) having a diminished or inactivated oxidative branch of the pentose phosphate pathway by inactivation of the gene(s) encoding glucose-6-phosphate dehydrogenase or by being genetically modified so as to reduce glucose-6-phosphate dehydrogenase activity as compared to a non- genetically modified microorganism; or (ii) not possessing glucose-6-phosphate dehydrogenase activity; d) furthermore characterized in that the activity of one or more of the enzymes selected from the group consisting of: - formate C-acetyltransferase, classified as EC 2.3.1.54; - acetate kinase, classified as EC 2.7.2.1 - L-lactate dehydrogenase, classified as EC 1.1.1.28 - phosphoenolpyruvate carboxylase, classified as EC 4.1.1.31 - phosphoenolpyruvate carboxykinase, classified as EC 4.1.1.49 - succinate dehydrogenase, classified as EC 1.3.99.1 - pyruvate decarboxylase, classified as EC 4.1.1.1 - acetaldehyde dehydrogenase (acetylating), classified as EC 1.2.1.10 - glycerol-3-phosphate dehydrogenase [NAD +], classified as EC 1.1.1.94 - acetolactate synthase, classified as EC 2.2.1.6 - methylglyoxal synthase, classified as EC 4.2.3.3 - formate hydrogenlyase, classified as EC 1.2.1.2 together with EC 1.12.1.2 is eliminated or reduced. - formate C-acetyltransferase, classified as EC 2.3.1.54; - acetate kinase, classified as EC 2.7.2.1 - L-lactate dehydrogenase, classified as EC 1.1.1.28 - phosphoenolpyruvate carboxylase, classified as EC 4.1.1.31 - phosphoenolpyruvate carboxykinase, classified as EC 4.1.1.49 - succinate dehydrogenase, classified as EC 1.3.99.1 - pyruvate decarboxylase, classified as EC 4.1.1.1 - acetaldehyde dehydrogenase (acetylating), classified as EC 1.2.1.10 - glycerol-3-phosphate dehydrogenase [NAD +], classified as EC 1.1.1.94 - acetolactate synthase, classified as EC 2.2.1.6 - methylglyoxal synthase, classified as EC 4.2.3.3 - formate hydrogenlyase, classified as EC 1.2.1.2 together with EC 1.12.1.2