While the ketogenic diet is often praised for its benefits, it carries significant risks and involves multiple strict contraindications that can make it dangerous or even life-threatening.Absolute contraindications involve conditions where the diet is strictly forbidden, primarily rare metabolic disorders affecting fat processing. For individuals with pyruvate carboxylase deficiency, the body cannot produce necessary glucose or properly utilize fat. Relying on a high-fat diet in this state leads to an accumulation of ketones and lactate, triggering a life-threatening combination of ketoacidosis and lactic acidosis. Fatty acid beta-oxidation disorders, such as carnitine palmitoyltransferase deficiency and primary carnitine deficiency, prevent the transport and burning of fat for energy within the cellular mitochondria. Because fat cannot be used for fuel, patients face a severe energy deficit. Porphyria is another absolute contraindication; the diet causes an overproduction of pre-heme molecules that the body cannot process, leading to toxic accumulation and severe symptoms like abdominal pain, seizures, hallucinations, and breathing problems.Relative contraindications are conditions where the diet is highly discouraged due to severe health risks. Patients with acute or chronic pancreatitis must avoid it because a compromised pancreas cannot produce enough enzymes to digest large amounts of fat. Acute liver failure also prevents proper fat metabolism, making high fat intake dangerous, though standard fatty liver disease is not a contraindication and may even improve on the diet. Individuals with advanced chronic kidney disease have a reduced ability to excrete ketones in their urine and face a higher risk of dangerous electrolyte imbalances. Furthermore, those with familial hypercholesterolemia should avoid the diet as it may severely exacerbate cardiovascular risks. It is also advised to wait at least 24 hours after receiving the anesthetic propofolbefore starting the diet, as being in ketosis drastically increases the risk of propofol infusion syndrome, which can lead to fatal metabolic acidosis and heart failure.Situations requiring extreme caution demand strict medical supervision. Patients with Type 2 diabetes who take specific medications—such as insulin or sulfonylureas—face severe risks of sudden hypoglycemia, while those on SGLT-2 inhibitors face a heightened risk of euglycemic diabetic ketoacidosis, a severe condition of blood acidification despite normal glucose levels. Pregnant and breastfeeding women should generally avoid the diet due to insufficient safety data on fetal development and the rare but real risk of lactation-related ketoacidosis. For individuals with gallstones, the diet stimulates gallbladder contraction, which can cause existing stones to migrate and trigger painful biliary colic. Those who have had their gallbladder removed no longer store bile efficiently and must introduce fats very gradually across multiple small meals to avoid severe digestive distress. Finally, the initial rapid loss of water and electrolytes on the diet poses a specific danger to those with heart arrhythmias or existing electrolyte deficiencies, and the diet's strong appetite-suppressing effect makes it highly unsuitable for undernourished individuals.

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