Mitochondrial membrane lipids play a critical role in regulating mitochondrial bioenergetics, particularly in oxidative phosphorylation (OXPHOS). These lipids, including phosphatidylcholine (PC), phosphatidylethanolamine (PE), and cardiolipin (CL), are essential for maintaining the structure and function of the inner mitochondrial membrane (IMM). They influence membrane properties, cristae ultrastructure, and the activity of proteins involved in OXPHOS, such as the electron transport chain (ETC) and ATP synthase. The unique lipid composition of the IMM is vital for efficient OXPHOS and other mitochondrial processes. Mitochondrial lipids are synthesized through various pathways, with some lipids, like PC and CL, produced within the mitochondria, while others, such as PE and PS, are imported from the endoplasmic reticulum (ER). The lipid composition of the IMM is crucial for cristae formation, which increases the surface area of the IMM and supports the generation of a high mitochondrial membrane potential (ΔΨm). CL, in particular, is essential for cristae folding and mitochondrial ultrastructure due to its ability to promote negative membrane curvature. Mutations in genes involved in mitochondrial lipid biosynthesis can lead to severe diseases, such as Barth syndrome, which is caused by impaired CL synthesis. These mutations result in reduced mitochondrial function, including impaired respiration and altered mitochondrial dynamics. Other genetic conditions, such as Sengers syndrome and Lenz-Majewski syndrome, are also linked to mitochondrial lipid abnormalities. Mitochondrial lipids also play a role in non-communicable diseases, including exercise-induced metabolic disorders, metabolic-dysfunction-associated steatotic liver disease (MASLD), diabetes, and neurodegenerative diseases like Alzheimer's and Parkinson's. Alterations in mitochondrial membrane lipids can affect OXPHOS, leading to impaired energy production and increased oxidative stress. The influence of mitochondrial lipids on bioenergetics is multifaceted, involving lipid-protein interactions, membrane properties, and cristae architecture. These lipids are essential for the proper functioning of mitochondrial proteins and the maintenance of ΔΨm. Understanding the role of mitochondrial lipids in bioenergetics is crucial for developing therapeutic strategies for mitochondrial diseases and metabolic disorders.Mitochondrial membrane lipids play a critical role in regulating mitochondrial bioenergetics, particularly in oxidative phosphorylation (OXPHOS). These lipids, including phosphatidylcholine (PC), phosphatidylethanolamine (PE), and cardiolipin (CL), are essential for maintaining the structure and function of the inner mitochondrial membrane (IMM). They influence membrane properties, cristae ultrastructure, and the activity of proteins involved in OXPHOS, such as the electron transport chain (ETC) and ATP synthase. The unique lipid composition of the IMM is vital for efficient OXPHOS and other mitochondrial processes. Mitochondrial lipids are synthesized through various pathways, with some lipids, like PC and CL, produced within the mitochondria, while others, such as PE and PS, are imported from the endoplasmic reticulum (ER). The lipid composition of the IMM is crucial for cristae formation, which increases the surface area of the IMM and supports the generation of a high mitochondrial membrane potential (ΔΨm). CL, in particular, is essential for cristae folding and mitochondrial ultrastructure due to its ability to promote negative membrane curvature. Mutations in genes involved in mitochondrial lipid biosynthesis can lead to severe diseases, such as Barth syndrome, which is caused by impaired CL synthesis. These mutations result in reduced mitochondrial function, including impaired respiration and altered mitochondrial dynamics. Other genetic conditions, such as Sengers syndrome and Lenz-Majewski syndrome, are also linked to mitochondrial lipid abnormalities. Mitochondrial lipids also play a role in non-communicable diseases, including exercise-induced metabolic disorders, metabolic-dysfunction-associated steatotic liver disease (MASLD), diabetes, and neurodegenerative diseases like Alzheimer's and Parkinson's. Alterations in mitochondrial membrane lipids can affect OXPHOS, leading to impaired energy production and increased oxidative stress. The influence of mitochondrial lipids on bioenergetics is multifaceted, involving lipid-protein interactions, membrane properties, and cristae architecture. These lipids are essential for the proper functioning of mitochondrial proteins and the maintenance of ΔΨm. Understanding the role of mitochondrial lipids in bioenergetics is crucial for developing therapeutic strategies for mitochondrial diseases and metabolic disorders.