A recombinant yeast, in the genome of which: (i) at least one nucleic acid encoding a malate dehydrogenase is overexpressed and/or is under the control of an inducible or repressible promoter, and (ii) at least one, preferably all, the nucleic acid encoding a malate dehydrogenase does not contain the Peroxisome Targeting Sequence thereof; at least one nucleic acid encoding a NADP-dependent malic enzyme is overexpressed and/or is under the control of an inducible or repressible promoter; (i) at least one nucleic acid encoding a phosphoenolpyruvate carboxylase that converts phosphoenol pyruvate into oxaloacetate is overexpressed and/or is under the control of an inducible or repressible promoter; and/or (ii) at least one nucleic acid encoding a phosphoenolpyruvate carboxykinase that converts phosphoenol pyruvate into oxaloacetate is overexpressed and/or is under the control of an inducible or repressible promoter; at least one nucleic acid encoding an acetaldehyde-CoA dehydrogenase is overexpressed and/or is under the control of an inducible or repressible promoter; and (i) at least one, preferably all, nucleic acid encoding a pyruvate kinase 1 has been deleted, and/or (ii) at least one, preferably all, nucleic acid encoding a pyruvate kinase 1 is independently under the control of an inducible or repressible promoter, under the control of a weak promoter, and/or in a destabilized form, wherein overexpression means that the expression is increased as compared to the non-modified microorganism, wherein the recombinant yeast is Saccharomyces cerevisiae. (i) at least one nucleic acid encoding a malate dehydrogenase is overexpressed and/or is under the control of an inducible or repressible promoter, and (ii) at least one, preferably all, the nucleic acid encoding a malate dehydrogenase does not contain the Peroxisome Targeting Sequence thereof; (i) at least one nucleic acid encoding a malate dehydrogenase is overexpressed and/or is under the control of an inducible or repressible promoter, and (ii) at least one, preferably all, the nucleic acid encoding a malate dehydrogenase does not contain the Peroxisome Targeting Sequence thereof; at least one nucleic acid encoding a NADP-dependent malic enzyme is overexpressed and/or is under the control of an inducible or repressible promoter; (i) at least one nucleic acid encoding a phosphoenolpyruvate carboxylase that converts phosphoenol pyruvate into oxaloacetate is overexpressed and/or is under the control of an inducible or repressible promoter; and/or (ii) at least one nucleic acid encoding a phosphoenolpyruvate carboxykinase that converts phosphoenol pyruvate into oxaloacetate is overexpressed and/or is under the control of an inducible or repressible promoter; (i) at least one nucleic acid encoding a phosphoenolpyruvate carboxylase that converts phosphoenol pyruvate into oxaloacetate is overexpressed and/or is under the control of an inducible or repressible promoter; and/or (ii) at least one nucleic acid encoding a phosphoenolpyruvate carboxykinase that converts phosphoenol pyruvate into oxaloacetate is overexpressed and/or is under the control of an inducible or repressible promoter; at least one nucleic acid encoding an acetaldehyde-CoA dehydrogenase is overexpressed and/or is under the control of an inducible or repressible promoter; and (i) at least one, preferably all, nucleic acid encoding a pyruvate kinase 1 has been deleted, and/or (ii) at least one, preferably all, nucleic acid encoding a pyruvate kinase 1 is independently under the control of an inducible or repressible promoter, under the control of a weak promoter, and/or in a destabilized form, wherein overexpression means that the expression is increased as compared to the non-modified microorganism, wherein the recombinant yeast is Saccharomyces cerevisiae. (i) at least one, preferably all, nucleic acid encoding a pyruvate kinase 1 has been deleted, and/or (ii) at least one, preferably all, nucleic acid encoding a pyruvate kinase 1 is independently under the control of an inducible or repressible promoter, under the control of a weak promoter, and/or in a destabilized form, wherein overexpression means that the expression is increased as compared to the non-modified microorganism, wherein the recombinant yeast is Saccharomyces cerevisiae.