The lipids are one of the most important sources of energy in both resting and stressed conditions, and occupy a majority of 30-35% of daily energy intake. In developing catabolism and stress, fats are the preferred source of energy, unlike sugars whose use is unstable due to the development of stress insulin resistance.
Only in the case of very severe hypoxia, hypoperfusion of tissues and failure of metabolic functions of the organs, such as multi-organ dysfunction syndrome, they take on their branched amino acid role. Fatty acid ketols are a ubiquitous source of energy for all tissues, including those normally dependent on glucose.
In addition to the role of energy sources, fatty acids play a major role as essential nutrients (linoleic acid and linolenic acid), are an important part of membranes and precursors for the formation of prostaglandins and thromboxanes.