Keto and Blood Sugar

This content discusses nutrition research and metabolic health topics for educational purposes only and is not medical advice. May contain outdated or inaccurate information. Always work with qualified healthcare professionals before making major dietary changes. Blood sugar management can be medically complex, especially for people with diabetes or other medical conditions, or those taking medications. Anyone with medical conditions should only make dietary changes under professional medical supervision. See Disclaimer and Terms of Service for full details.

Understanding Keto and Blood Sugar

One of the primary reasons many people try keto is to improve blood sugar stability. By dramatically lowering carbohydrate intake, keto reduces the amount of glucose entering the bloodstream after meals.

Instead of relying heavily on glucose for energy, the body gradually shifts toward using fats and ketones as fuel.

This can lead to:

• Smaller blood sugar spikes

• Fewer energy crashes

• Reduced hunger swings

• Lower insulin demand

• More stable appetite control

Research suggests ketogenic diets may help improve blood sugar markers in some individuals with type 2 diabetes or insulin resistance, although results vary by person.

Why Carbohydrates Affect Blood Sugar

Carbohydrates break down into glucose during digestion. High-carb foods such non-keto versions of:

• Bread

• Rice

• Pasta

• Sugary drinks

• Desserts

• Chips

• Juice

can rapidly increase blood sugar levels.

Keto typically limits net carbs to roughly 20–50g daily, which theoretically can help to reduce these spikes.

Keto and Insulin

Insulin helps move glucose from the bloodstream into cells. When carbohydrate intake stays lower:

• Blood sugar often rises less dramatically

• Insulin demand may decrease

• Some people experience improved insulin sensitivity

Some studies have shown improvements in HbA1c levels and reductions in diabetes medication needs under medical supervision.

Potential Benefits Some People Report

More Stable Energy

Many keto dieters report fewer afternoon crashes and reduced “rollercoaster” hunger patterns.

Reduced Cravings

Stable blood sugar may help reduce frequent sugar cravings and reactive hunger.

Appetite Control

Higher protein and fat intake may increase satiety.

Weight Loss

Some people lose weight more easily when reducing ultra-processed carbohydrates and sugar-heavy foods.

Important Risks and Considerations

Keto is not automatically safe or appropriate for everyone. Potential concerns include:

• Electrolyte imbalance

• Constipation

• Low fiber intake

• Elevated LDL cholesterol in some people

• Medication interactions

• Hypoglycemia risk for diabetics using insulin or certain medications

People with diabetes and other related medical conditions should not start keto without medical supervision. Blood sugar medications sometimes need adjustment quickly when carbohydrate intake changes.

Strategies for Better Blood Sugar Stability on Keto

(The following pertains to people with normal blood sugar metabolism ; people with diabetes and other medical conditions should not be on a keto diet without medical supervision.)

Prioritize Whole Foods

Focus on foods such as:

• Eggs

• Seafood

• Poultry

• Non-starchy vegetables

• Olive oil

• Avocados

• Nuts and seeds

Avoid “Keto Junk Foods”

Many ultra-processed keto products contain:

• Highly refined oils

• Artificial fillers

• Hidden starches

• Blood-sugar-triggering ingredients

Include Fiber

Fiber may help:

• Improve satiety

• Support digestion

• Slow glucose absorption

Watch Sweeteners

Some sweeteners may still trigger cravings or overeating in sensitive individuals.

Who Should Use Extra Caution

Consult a healthcare professional before keto, and this is critically important if you:

• Take diabetes medications

• Have kidney disease

• Are pregnant or breastfeeding

• Have a history of eating disorders

• Have diet-related conditions such as celiac

• Have other medical conditions

References & Research:

• Cherney K. Keto and Blood Sugar. healthline.com. Updated March 24, 2025. (Medically reviewed by Alana Biggers, M.D., MPH).

• Tinguely D, Gross J, Kosinski C. Efficacy of Ketogenic Diets on Type 2 Diabetes: a Systematic Review. Curr Diab Rep. 2021;21(9):32. doi:10.1007/s11892-021-01399-z. PMID: 34448957.