Low-fat vegan diet cut liver fat by a third in type 2 diabetes, 16-week study finds

A low-fat vegan diet cut liver fat by about a third in adults with type 2 diabetes over 16 weeks, according to a study by the Physicians Committee for Responsible Medicine (PCRM), carried out with the Yale School of Medicine and published in BMJ Open Diabetes Research & Care. The findings were made public on Thursday 8 October 2026. Participants were asked to eat mainly vegetables, whole grains, legumes and fruit, without counting calories or controlling portion sizes. The researchers report that liver fat, abdominal fat and body weight fell, and that markers of insulin sensitivity and of the insulin-producing beta cells improved. The trial was single-arm, meaning it had no comparison group.

Fat building up inside the liver is closely tied to insulin resistance, the problem at the root of type 2 diabetes. If diet alone can reduce that fat noticeably within four months, it gives people with diabetes, and their doctors, another practical tool alongside medicines. The study's authors argue that the change in liver fat helps explain why blood sugar and insulin function improved.

The diet tested will look familiar to many Indian households. Pulses, vegetables, whole grains and fruit have long been the base of traditional vegetarian meals in much of India. The study's version was strict, however: no dairy, no eggs, no meat, and low in added fat. That last point matters. Many Indian dishes rely on generous ghee or oil, and much of the daily plate is refined rice or wheat. An ICMR-INDIAB analysis of more than 18,000 Indian adults found carbohydrates, mainly rice, wheat and sugar, supply about 62% of daily calories, and linked high carbohydrate intake with higher risk of type 2 diabetes and obesity. Being vegetarian, in other words, is not the same as eating the kind of diet this trial tested.

Readers should weigh the evidence with care. A single-arm trial cannot show how much of the benefit came from the diet itself rather than from weight loss, or from simply being in a study. The trial lasted only 16 weeks, so it says nothing about long-term results. It was also led by an advocacy group for plant-based diets. Larger, controlled and longer studies would be needed before firm conclusions are drawn.

Short-term: The results add to interest in plant-based eating for diabetes care. People already on diabetes medicines should not change their diet sharply without talking to their doctor, because falling blood sugar can require dose changes.

Long-term: If controlled trials confirm the findings, doctors could lean more on structured plant-based diets to reduce liver fat and improve insulin function, alongside exercise and medication.

Who is affected: Adults with type 2 diabetes or fatty liver, families who cook traditional vegetarian food and want to make it healthier, and dietitians and doctors advising them.

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