Keto Diet Slashes Liver Fat 67% in Obesity Trial

People struggling with obesity and prediabetes just got powerful new evidence that what they eat matters as much as how much weight they lose.

Researchers at Washington University School of Medicine compared three popular diets in 42 people with obesity, prediabetes, and fatty liver disease. Everyone lost about 10% of their body weight over four to five months, but the results weren't equal.

The ketogenic diet group saw their liver fat plummet by 67%, compared to just 45% for those following Mediterranean or low-fat diets. Even more remarkable, half of the keto group no longer qualified as having prediabetes by the end of the study.

The keto diet delivered just 4% of calories from carbohydrates and 73% from fat. Mediterranean dieters ate 50% carbs and 35% fat, while the plant-forward group consumed 70% carbs and 15% fat. Researchers provided all meals and met with participants weekly to keep everyone on track.

All three groups saw improvements in insulin sensitivity and body fat reduction. But the keto group experienced unique metabolic changes that researchers believe drove the superior results.

Blood tests revealed that keto participants had the biggest increase in glucagon, a hormone that helps burn liver fat. They also showed the largest drop in insulin levels, another factor that reduces fat storage in the liver.

First author Max Petersen notes the team was surprised by one finding. Despite eating the most fat, keto dieters didn't see increases in blood cholesterol or fat levels.

Why This Inspires

This research arrives at a perfect moment. Weight loss medications like GLP-1 drugs have transformed obesity treatment, helping millions shed pounds. But this study shows that the type of food people eat can amplify those benefits even further.

Study leader Samuel Klein emphasizes that the findings matter most for people with fatty liver disease and prediabetes. For them, cutting carbohydrates appears to deliver metabolic improvements that go well beyond simple weight loss.

The study offers something practical: clear evidence that different diets affect the body in different ways, even when weight loss is identical. That means people have more control over their health outcomes than they might realize.

The research gives doctors and patients concrete data to guide treatment decisions for the estimated 40% of American adults living with obesity.

Better liver health and freedom from prediabetes are now within reach for millions through dietary choices backed by rigorous science.