Mesenchymal stem cells (MSCs) are multipotent cells capable of differentiating into adipocytes or osteoblasts. The balance between adipogenic and osteogenic differentiation is regulated by various external factors, including chemical, physical, and biological cues. These factors influence signaling pathways and transcription factors that guide MSC commitment to either lineage. Dysregulation of this balance is linked to diseases such as osteoporosis, osteopenia, and osteopetrosis. Recent studies highlight the role of signaling pathways like TGFβ/BMP, Wnt, Notch, Hedgehogs, and FGFs in regulating MSC differentiation. MicroRNAs also play a critical role in modulating this balance. Chemical factors such as IBMX, Dex, and β-GP influence adipogenesis and osteogenesis. Physical factors, including cell shape, mechanical forces, and ECM components, affect MSC fate. Biological factors like aging, PPARγ, and ROS also influence the balance. Adipokines and osteokines secreted by adipocytes and bones reciprocally regulate bone and fat metabolism. MSCs are crucial for bone homeostasis, and their lineage commitment is tightly controlled. Understanding these mechanisms is essential for developing therapies for bone and metabolic diseases. Future research should focus on integrating 'MSC omics' to fully understand the balance between adipogenic and osteogenic differentiation.Mesenchymal stem cells (MSCs) are multipotent cells capable of differentiating into adipocytes or osteoblasts. The balance between adipogenic and osteogenic differentiation is regulated by various external factors, including chemical, physical, and biological cues. These factors influence signaling pathways and transcription factors that guide MSC commitment to either lineage. Dysregulation of this balance is linked to diseases such as osteoporosis, osteopenia, and osteopetrosis. Recent studies highlight the role of signaling pathways like TGFβ/BMP, Wnt, Notch, Hedgehogs, and FGFs in regulating MSC differentiation. MicroRNAs also play a critical role in modulating this balance. Chemical factors such as IBMX, Dex, and β-GP influence adipogenesis and osteogenesis. Physical factors, including cell shape, mechanical forces, and ECM components, affect MSC fate. Biological factors like aging, PPARγ, and ROS also influence the balance. Adipokines and osteokines secreted by adipocytes and bones reciprocally regulate bone and fat metabolism. MSCs are crucial for bone homeostasis, and their lineage commitment is tightly controlled. Understanding these mechanisms is essential for developing therapies for bone and metabolic diseases. Future research should focus on integrating 'MSC omics' to fully understand the balance between adipogenic and osteogenic differentiation.