Keto made easy

Ketosis vs Ketoacidosis: Why They Are Not the Same Thing

Nutritional ketosis is a controlled state in which ketones rise modestly and insulin keeps them in check; diabetic ketoacidosis (DKA) is a medical emergency in which a severe lack of insulin lets ketones climb so high that the blood becomes acidic.

On this page

The difference at a glance

The two states share a word root and both involve ketones. That is where the similarity ends. A widely cited review of ketone physiology, Laffel 1999, covers the ketone levels seen in each state and how blood and urine ketone tests are used in diabetes (Laffel 1999). The NIH StatPearls clinical overview of the ketogenic diet also sets out how nutritional ketosis differs from DKA (Masood et al.).

Nutritional ketosis Diabetic ketoacidosis
Cause Eating few carbs, or fasting Severe lack of insulin, most often in type 1 diabetes
Insulin Low but present Very low or absent
Blood sugar Normal or lower than usual Usually very high
Ketone level Modestly raised Far higher
Blood acidity Stays in the normal range Becomes acidic
How it feels Usually normal once adapted Very unwell; needs emergency care
Self-limiting? Yes No

The key word is self-limiting. In nutritional ketosis, the body has brakes. In DKA, the brakes are missing.

Why insulin is the dividing line

Ketone production in the liver is regulated by insulin and glucagon (Dhillon & Gupta). Insulin acts as the brake.

  1. In a person who makes insulin, cutting carbs lowers insulin, and the liver makes more ketones.
  2. As ketones rise, the body still releases some insulin, which slows fat release and ketone production.
  3. Ketones level off at a moderate level, and the blood stays in its normal acid range.

In someone who makes little or no insulin, step 2 fails. Fat keeps pouring out, the liver keeps making ketones, and blood sugar also rises because insulin is not moving glucose into cells. Ketones and sugar climb together. That is DKA.

So for most people with a working pancreas, a low-carb diet cannot push them into ketoacidosis. The risk is concentrated in people whose insulin supply is impaired.

Who is at risk of ketoacidosis

Group Why it matters
Type 1 diabetes The body makes little or no insulin of its own; ketone control depends on injected insulin
Type 2 diabetes on blood-sugar medicines Doses may need to change when carbs drop
People taking SGLT2 inhibitors (a class of diabetes medicine also used for some heart and kidney conditions) A doctor should review this medicine before a very-low-carb diet
Kidney disease The kidneys help clear ketones and balance blood acidity

The American Diabetes Association's 2025 Standards of Care list low-carbohydrate eating among acceptable patterns for people with diabetes when it is individualised (ADA 2025). Individualised means planned with your care team, especially around medicine doses.

Who should talk to a doctor before keto

Talk to your doctor before you start if any of these apply:

KetoDick on this: he tells anyone on medication to review his advice with their doctor, especially dosing (video UygKGoP_BtA). He says type 2 diabetics often have some kidney issue they do not know about, and should talk to a doctor because for them a dark ketone strip could matter (video GojQvo_2GS0). He also advises older people, or anyone with a health history, to get baseline labs before starting so they can compare at 6 to 12 months (same video). See Blood Tests Before Keto.

Dark urine strips: what they do and do not mean

A very dark purple urine strip is the most common reason people worry about ketoacidosis. For someone without diabetes, a dark strip does not mean ketoacidosis.

Urine strips detect acetoacetate that spills into urine. The shade depends on how concentrated your urine is and how many ketones your body is wasting, not just how many are in your blood. Early in keto, the body tends to spill more. Over months, strips often fade even when blood ketones are steady.

To read a dark strip sensibly:

  1. Check your urine colour. Dark urine makes a dark strip. Drink water and test again later. See Hydration.
  2. Treat the strip as yes or no. Any colour means some ketones are present. The exact shade means little.
  3. If you have diabetes or kidney disease, do not rely on strips. Follow your doctor's plan, which may use blood ketone testing.

KetoDick on this: in his opinion, dark strips are not dangerous for someone with healthy kidneys and no diabetes, and the usual reply "you're dehydrated" should be checked against the colour of the urine itself (video GojQvo_2GS0). He says strips show less over the months as you adapt (video 8wOheKcBEd8). This is his reading as a non-doctor; the literature above is why people with diabetes are the exception.

For more on strips, see Urine Strips and Are Dark Ketone Strips Dangerous?.

Warning signs that need medical care

If you have diabetes, especially type 1, or take an SGLT2 inhibitor, ask your care team before you start which symptoms and which ketone readings should send you to urgent care. Write their answer down.

If you then feel very unwell on a low-carb diet, contact them promptly, whatever your strip or meter says. A home strip is not a reason to wait.

Last verified: 2026-10-31