Have you tried fasting or a perhaps a ketogenic diet and felt horrible? If so, one reason could be found in the way that your body uses different types of fats.
Using Fat for Fuel: Short-chain fatty acids
The human body is wonderfully made and resilient enough to get energy from a variety of food sources. Most people can survive and thrive using either carbs or fats. When our ancestors ran out of grain or potatoes they could survive on fish or sheep. But there are certain genetic mutations that can cause people not to burn fat for energy as efficiently.
Short-Chain Acyl-CoA Dehydrogenase Deficiency (SCADD) is a disorder of fatty acid oxidation and mitochondrial energy production. Think back to high school biology class when you learned that the mitochondria are the cellular "powerhouse", making ATP or energy for our body. That process of ATP production in the mitochondria can begin with either glucose (a sugar) or fatty acids.
If you start with glucose, glycolysis breaks down the glucose into two pyruvate molecules, which are then transformed into acetyl-CoA. Fatty acids also can be used to create acetyl-CoA, which begins the production of ATP in the Krebs' cycle and then the electron energy transport chain.
Short-Chain Acyl-CoA Dehydrogenase enzyme deficiency
Short-Chain Acyl-CoA Dehydrogenase is an enzyme that converts short-chain fatty acids for use in the mitochondria, and a deficiency of the enzyme makes it harder for an individual to use certain fatty acids for fuel.
Mutations in the ACAD gene can cause short chain acyl-CoA dehydrogenase deficiency (SCADD). SCADD is classified as an inborn error of metabolism, which means it is an inherited disorder that affects a person's ability to metabolize a specific nutrient. It is a rare disorder that is usually detected in infancy. Two copies of the mutation are needed in order to have the disorder.
Symptoms in infants with SCADD include hypoglycemia, lack of energy, vomiting, poor feeding, seizures, poor muscle tone, developmental delays and failure to grow/thrive. This can be deadly if not managed with regular feedings.
Some newborn screenings now look for SCADD. Early detection and treatment can mitigate the developmental problems. [ref] Increased screening has led to research showing that not all people who carry the SCADD mutations have symptoms.
Affected individuals may only have symptoms during times of fasting, illness, or other physiologic stress. During fasting or stress, the body can shift from using carbohydrates for energy to burning fatty acids. A recommendation for children with SCADD is to make sure they eat regularly to prevent hypoglycemia. (More info on SCADD)
Carriers of just one mutation in the ACADS gene may also have symptoms when their bodies are stressed, but not to the same extent as children or adults with SCADD. Studies so far have been small and inconclusive. [ref]
Recent research points to the mutations in ACADS causing the protein to misfold. It is theorized that SCADD symptoms may be due both to the decreased cellular energy combine with a toxic accumulation of the enzyme. [ref]
ACADS Genetic variants:
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