Low-Fat Vegan Diet Linked to Less Liver Fat in Type 2 Diabetes

This was a single-arm clinical trial. Twenty-five adults with type 2 diabetes all followed the same diet, and there was no comparison group. It ran in Washington, DC, between January 2024 and November 2025. Without a control group, the results show what changed, not what caused the change.

Participants were asked to eat vegetables, grains, legumes and fruit, and to avoid animal products and added fats. The target mix was about 75% of energy from carbohydrate, 15% from protein and 10% from fat. No meals were provided. A registered dietitian gave weekly group support and individual counseling. Participants were told to eat until full, not to hit a calorie target. They took vitamin B12, kept their usual exercise habits and stayed on their usual medicines unless their own doctors changed them.

The researchers used scans to measure fat inside the liver and muscle, a type of fat stored in places where it does not belong. Fat in these organs is linked to insulin resistance, when the body responds poorly to insulin. According to the paper, average body weight fell by 6.0 kg, or 6.6%. Visceral fat, the fat around internal organs, fell. Liver fat dropped by 33.0% (95% confidence interval, 17.3 to 48.7 percentage points of relative change).

Other measures moved the same way. Fasting and after-meal measures of insulin resistance and insulin sensitivity improved. So did several measures of beta-cell function, which describes how well the pancreas cells that make insulin respond to rising glucose. Advanced glycation end products, or AGEs, also fell in the skin. AGEs are compounds that form when sugars react with proteins and are linked to inflammation.

Lifespan.io, which covered the study, reported further numbers. Average HbA1c, a marker of blood sugar over about three months, fell from 7.6% to 6.6%. Fasting glucose fell from 155 to 116 mg/dL. Participants reported eating about 346 fewer calories a day. LDL cholesterol fell, but HDL cholesterol fell too, and triglycerides did not change significantly. Lifespan.io also said five of the 16 metformin users cut their dose and two stopped it.

Those medication changes matter. They make it harder to say how much of the blood sugar improvement came from the diet itself. The calorie drop matters too. Even without a target, people ate less and lost weight, and weight loss alone can improve blood sugar and liver fat.

The authors say this directly. Because there was no control group, the changes cannot be attributed to the diet's makeup apart from the lower energy intake and weight loss. They call for randomized trials with comparison groups matched for weight loss or given standard care.

The people studied were also a specific group. They had HbA1c between 6.5% and 10.5% and a body mass index between 26 and 40. They were not using insulin, sulfonylureas or weight-loss drugs, including incretin-based therapies. Lifespan.io noted that some lean mass was lost as well.

For you

For readers, the practical point is modest. A food-based approach that does not require tracking portions may be associated with weight loss and better metabolic markers in some people with type 2 diabetes. Study lead Hana Kahleova said, per Lifespan.io, that the results show a shift toward plants can reduce liver fat by a third "without anyone having to count a single calorie." The trial design supports the first part of that more firmly than any claim about cause.

The next step to watch is a randomized trial that compares this diet with another approach producing the same weight loss, which would show whether the food itself adds anything.

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