Dr. Axe Wire · Study decoded · gut

Low Fat Vegan Diet Cuts Liver Fat 33% In Adults With Type 2 Diabetes

A 16-week eat-to-satiety vegan diet lowered liver fat, visceral fat and HbA1c in adults with type 2 diabetes, with no calorie counting required.

By Dr. Axe Editorial Team · October 19, 2026 · 1 source · Watch

Photo: Pexels

A low-fat vegan diet eaten to satiety for 16 weeks cut liver fat by 33% in adults with type 2 diabetes, according to a study published October 8, 2026 in BMJ Open Diabetes Research & Care.

33%less liver fat

6.6%body weight lost

25adults, 16 weeks

Researchers followed 25 adults with type 2 diabetes for 16 weeks on a low-fat vegan diet of vegetables, grains, legumes and fruit (about 75% carbohydrate, 15% protein, 10% fat), with no calorie target; 24 of 25 completed it. Body weight dropped 6.0 kg (6.6%), mostly fat mass (down 4.2 kg), though lean mass fell 2.4 kg. Visceral fat fell 290 cubic centimeters and liver fat, measured by MRI spectroscopy, dropped 33.0%. A skin-fluorescence marker of advanced glycation end products, compounds formed when sugar reacts with proteins in the body, fell 0.4 points. HbA1c fell 1.0 percentage point. Insulin resistance (HOMA-IR) dropped and two insulin-sensitivity measures rose. Several beta-cell function markers, including insulin output at set glucose levels, also increased. Self-reported calorie intake fell 346 calories a day though none was prescribed.

Excess fat stored in the liver and muscle blocks insulin's signal to cells to take up blood sugar, a known driver of insulin resistance and beta-cell decline in type 2 diabetes. The authors state the shift toward high-fiber, low-fat plant foods produced a spontaneous calorie deficit without tracking, which they link to the metabolic changes seen. Lower glycation end products may have contributed separately.

Liver Fat and Body Weight After 16 Weeks on a Vegan Diet

BMJ Open Diabetes Research & Care, 2026, Kahleova et al.

There was no control group, so the authors are explicit that diet composition cannot be separated from the accompanying calorie reduction and weight loss. Lean mass loss accounted for about 40% of total weight lost, which the authors flag as a reason to pair future plant-based trials with resistance training. The study was co-funded by the Physicians Committee for Responsible Medicine, a nonprofit that promotes plant-based diets and paid five of the authors.

Dr. Axe’s Take

I'd expect this pattern: liver fat clears fast, so insulin sensitivity rebounds before muscle fat even budges. The lean mass loss is the real tradeoff worth naming. If you have type 2 diabetes and want to try this, build meals around legumes, vegetables, whole grains and fruit, and add resistance training two to three days a week to protect muscle. Keep taking any prescribed medication exactly as directed; several participants here had metformin adjusted by their own doctors as their numbers improved, and that call belongs with your prescribing physician.

— Dr. Axe

Take the Metabolic Health Quiz →

Study summary

Who: 25 adults with type 2 diabetes (24 completed); treated with diet and/or oral medication, not insulin or sulfonylureas
Design: Single-arm clinical trial, no control group, 16 weeks, outpatient setting in Washington, DC
Dose: Ad libitum low-fat vegan diet: about 75% carbohydrate, 15% protein, 10% fat; no calorie target; 500 mcg/day vitamin B12
Primary result: Liver fat down 33.0%; body weight down 6.0 kg (6.6%); visceral fat down 290 cm3
Secondary: HbA1c down 1.0 point; HOMA-IR (insulin resistance) down 2.5; PREDIM (insulin sensitivity) up 1.3 mg/min/kg; AGE score down 0.4; LDL cholesterol down 22.0 mg/dL
Funding / conflicts: Funders listed in the journal record: National Institutes of Health; Physicians Committee for Responsible Medicine. Conflicts declared in the PubMed record: five authors were paid by the Physicians Committee for Responsible Medicine for their work on this study, and one author serves without pay as its president and writes books and gives lectures on nutrition.
Date: Oct 8, 2026