It has been found that high amounts of aspartate equivalents in combination with vitamin B12 and/or biotin, especially in relative absence of glutamate equivalents, improve the metabolism of ketobodies and/or lactate in a mammal's body, especially in diseased or traumatic conditions. As a result, levels of ketobodies and lactate can be decreased and unphysicologically high acidity normalised. Thus, it is an object of the invention to provide an enteral nutritional or a pharmaceutical composition for the treatment and/or prevention of disturbed ketone and lactate metabolism, i.e. elevated concentrations of ketone bodies, lactate and/or other organic acids and/or insufficient pH homeostasis, especially elevated concentrations of ketone bodies and/or lactate, in a mammal's blood, wherein the composition comprises high amounts of aspartate equivalents in combination with vitamin B12 and/or biotin, preferably in relative absence of glutamate equivalents.