Long Chain 3-Hydroxyacyl-CoA Dehydrogenase (LCHAD) deficiency is an inherited disorder that prevents the body from using certain fats as an energy resource. Problems related to LCHAD deficiency can be triggered by periods of fasting or by illnesses such as viral infections. Signs and symptoms of LCHAD deficiency usually begin appearing in early infancy. These include feeding difficulties, lack of energy, low blood sugar, weak muscle tone, liver problems, and abnormalities in the retina. As children with LCHAD deficiency grow, they may experience muscle pain, breakdown of muscle tissue, and a loss of sensation in their arms and legs. Additional symptoms may include serious heart problems, breathing difficulties, coma, and sudden death. Many complications of LCHAD deficiency can be alleviated by avoiding fasting and prolonged excercising. A low fat, high carbohydrate diet, as well as Medium Chain Triglyceride oil (MCT oil) and L-carnitine supplements are generally recommended for individuals with this disorder. LCHAD deficiency is caused by pathogenic variants in the HADHA gene.