<jats:title>ABSTRACT</jats:title><jats:p>Control of brain energy metabolism and regulation of synaptic activity through gliotransmission are two important ways, through which astrocytes contribute to mental functions. However, the potential functional and molecular links between these two astrocyte-dependent processes have been scantly explored. Here we show that a lactate-dependent shift of glycolysis underlies the production of the gliotransmitter D-serine by acute activation of astrocyte type-1 cannabinoid (CB1) receptors, thereby gating synaptic and cognitive processes. Acute cannabinoid application causes a CB1 receptor-dependent rapid and reversible increase of lactate production and release in primary astrocyte cultures. As shown before, mutant mice lacking the CB1 receptor gene in astrocytes (GFAP-CB1-KO) were impaired in a novel object recognition (NOR) memory task. This phenotype was rescued not only by the gliotransmitter D-serine, but also by its precursor L-serine. Surprisingly, the administration of lactate and of an agonist of the lactate receptor HCAR1 also reverted the memory impairment of GFAP-CB1-KO mice. This rescue effect was abolished by<jats:italic>in vivo</jats:italic>blockade of the astrocyte-specific phosphorylated pathway (PP), which diverts glycolysis towards L-serine synthesis, suggesting that lactate signaling might promote the accumulation of this amino acid. Consistent with this idea, lactate and HCAR1 agonism increased the co-agonist occupancy of CA1 post-synaptic hippocampal NMDA receptors. This effect of lactate was abolished by blockade of PP. By establishing a mechanistic link between lactate production and signaling, serine availability, synaptic activity and behavior, these results reveal an unforeseen functional connection between energy metabolism and gliotransmission to control cognitive processes.</jats:p>