A clinical trial published in Cell Metabolism found that a ketogenic diet outperformed both a Mediterranean diet and a very-low-fat plant-forward diet on two specific measures: liver fat and prediabetes reversal. The trial’s most useful feature isn’t the winner, though. It’s how the researchers set it up.
The design is what makes this interesting
Most diet comparisons are confounded by the obvious problem that whichever group loses more weight tends to show better health markers, which tells you about the weight loss rather than the food. This trial was built to sidestep that. Researchers deliberately structured all three diets so participants lost roughly the same amount, about 10% of body weight. With weight loss held even, any remaining differences between the groups point to the composition of the diet itself rather than the pounds lost.
What the results showed
The ketogenic group cut liver fat by 67%, against about 45% for the other two diets. The gap on prediabetes was wider still: roughly half of the keto group no longer met the criteria for prediabetes by the end of the trial, compared with 29% on the Mediterranean diet and 7% on the very-low-fat plant-forward diet. Given that everyone lost about the same weight, that spread is the trial’s central finding.
Why liver fat is the measure to watch
Liver fat gets far less public attention than cholesterol or blood pressure, but it is closely tied to insulin resistance, and fatty liver disease is common in people with obesity and type 2 diabetes while frequently going undiagnosed because it produces no symptoms early on. A large reduction in liver fat is a meaningful metabolic result, not a cosmetic one, which is part of why this trial drew attention despite its size.
The limits, which are substantial
This was a small trial: 55 people enrolled and 42 completed it. That is enough to detect a large effect but not enough to settle a debate, and results from a group that size don’t reliably generalize. It also ran short-term, so it says nothing about whether the advantage holds at two or five years, which matters enormously for keto specifically, since adherence is the well-documented problem with very-low-carbohydrate diets. A diet that produces better markers for people who stick to it is only better in practice if people stick to it.
The honest read is narrow: for people with obesity and prediabetes, over a defined period, with weight loss matched, a ketogenic approach moved liver fat and blood sugar markers more than the alternatives. That’s a real finding. It is not a verdict that keto is the healthiest diet generally, and the trial wasn’t designed to answer that question.
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[…] cuts both ways, which is why it’s a reporting failure and not a bias. A trial this month found a ketogenic diet cut liver fat 67% against roughly 45% for comparison diets, and reversed prediabetes in about half of participants. Impressive framing. Then you find the […]