Ketoacidosis - why it doesn't happen on a ketogenic diet

Jan 10, 2025

2 min read

Ketoacidosis is a dangerous condition that arises when the body produces excessively high levels of ketones, leading to an imbalance in blood acidity. While ketone production is normal during a ketogenic diet or fasting, ketoacidosis occurs only under specific pathological circumstances. The most common types are diabetic ketoacidosis (DKA) and alcoholic ketoacidosis (AKA). Here are the circumstances for each:

1. Diabetic Ketoacidosis (DKA)

Occurs primarily in people with type 1 diabetes (and less commonly in type 2 diabetes), due to insulin deficiency.

Insufficient insulin: Insulin is needed to regulate blood glucose and suppress ketone production. Without insulin, blood glucose rises (hyperglycemia), and the liver produces excess ketones.

• Triggering factors:

• Missed or insufficient insulin therapy

• Illness or infection, increasing stress hormones like cortisol

• Trauma, surgery, or other physical stress

• Excessive carbohydrate intake with insufficient insulin coverage

• Symptoms: High blood glucose (>250 mg/dL), nausea, vomiting, fruity breath (acetone odor), and confusion.

2. Alcoholic Ketoacidosis (AKA)

Occurs in individuals with chronic alcohol use, particularly after a period of binge drinking followed by starvation.

• Insufficient glucose intake: Starvation and alcohol metabolism deplete glycogen stores. The liver shifts to producing ketones as an energy source.

• Impaired insulin secretion: Alcohol inhibits normal insulin production, further promoting ketone production.

• Symptoms: Nausea, vomiting, abdominal pain, and ketonemia (elevated ketones) despite normal or low blood glucose levels.

3. Starvation Ketoacidosis

Rare, occurs after prolonged starvation (weeks) when glycogen and fat stores are exhausted.

• Severe malnutrition: Leads to excessive reliance on ketone production for energy.

• Pregnancy: Increased metabolic demands during pregnancy can accelerate the condition in malnourished women.

4. Other Causes

• Medications: Certain drugs (e.g., sodium-glucose co-transporter 2 inhibitors like SGLT2 inhibitors) can induce ketoacidosis in people with diabetes, even at normal blood glucose levels.

• Severe illness or trauma: Can cause ketoacidosis in non-diabetics due to stress-induced hormonal imbalances (e.g., glucagon dominance).

Why It Doesn’t Happen on a Keto Diet

Nutritional ketosis in a ketogenic diet is regulated by insulin, which prevents ketone levels from rising dangerously high. In a healthy individual:

• Blood ketone levels during ketosis rarely exceed 3–5 mmol/L.

• Ketoacidosis typically occurs when ketone levels rise above 10–20 mmol/L, accompanied by severe acidosis.