Can Keto Reduce Insulin Resistance?
Yes. A ketogenic diet can help reduce insulin resistance, particularly in people who have excess body fat or already show signs of metabolic problems.
Insulin resistance occurs when the body’s cells become less responsive to insulin. The pancreas then needs to produce more insulin to keep blood sugar under control.
Insulin resistance often develops long before type 2 diabetes. It is a common underlying problem in people with prediabetes, although not everyone with insulin resistance will develop diabetes.
Understanding how keto affects insulin is therefore relevant to prevention, not only diabetes treatment.
How Does Keto Affect Insulin Resistance?
1. Eating Fewer Carbohydrates Lowers Insulin Levels
Carbohydrates are broken down into glucose during digestion.
When carbohydrate intake falls sharply, blood sugar rises less after meals. The pancreas generally needs to release less insulin.
This change can begin within days, before substantial weight loss occurs.
2. Losing Excess Body Fat Can Reduce Insulin Resistance
Excess fat in the liver and around abdominal organs can make cells less responsive to insulin.
When a ketogenic diet helps reduce this fat, cells may become more sensitive to insulin.
This means the body can control blood sugar with less insulin.
Weight loss is therefore an important mechanism through which keto may reduce insulin resistance.
3. Ketosis Changes How the Body Uses Energy
When carbohydrate intake becomes very low, the liver produces ketones from fat.
Ketones provide an alternative energy source, reducing the body’s dependence on glucose.
Ketosis is a defining feature of the ketogenic diet, but it is still unclear how much of the reduction in insulin resistance comes directly from ketones rather than from carbohydrate restriction and weight loss.
What Do Clinical Studies Show?
A 2024 systematic review and meta-analysis combined 29 clinical trials involving 2,359 people with type 2 diabetes.
Compared with control diets, ketogenic diets reduced:
- Fasting insulin levels
- Insulin resistance, measured using HOMA-IR, a calculation based on fasting insulin and glucose
- Fasting blood sugar levels
These findings are relevant because insulin resistance is also common in people with prediabetes and can develop before diabetes is diagnosed.
The results support keto as a possible approach to reducing insulin resistance. However, the exact size of the benefit in people without diabetes cannot be determined from this review.
Most practical benefits are observed during active dietary treatment. Whether they persist over many years depends partly on sustained changes in body weight and metabolism.
Based on Research
Ghasemi P. et al. Impact of very low carbohydrate ketogenic diets on cardiovascular risk factors among patients with type 2 diabetes; GRADE-assessed systematic review and meta-analysis of clinical trials. Nutrition & Metabolism, July 2024.
https://link.springer.com/article/10.1186/s12986-024-00824-w
