Type 1 diabetes: low-fat vegan diet associated with reduced insulin needs

In adults with type 1 diabetes, a low-fat vegan diet has been associated with a marked decrease in insulin requirements, without restricting calories or carbohydrates.According to an analysis published in BMC Nutrition, participants following this approach reduced their total daily insulin dose by 28%. Previous data from the same trial also showed an average weight loss of approximately 5 kg (11 lb), as well as measurable improvements in insulin sensitivity and overall glycemic control.The authors attribute this decrease in insulin requirements to improved insulin sensitivity. They note that previous data suggest that a lower-fat diet may promote peripheral glucose uptake.The research, conducted by the Physicians Committee for Responsible Medicine, involved 58 adults with type 1 diabetes, randomly assigned for 12 weeks to either a vegan group (n = 29) or a portion-controlled diet group (n = 29).Participants on the plant-based diet reduced their total daily insulin dose by 28%, or 12.1 units per day. In contrast, participants on the portion-controlled diet did not experience a significant change in their insulin use.Lower insulin costsBeyond dose reductions, participants in the vegan group also saw their daily insulin costs decrease by 27%, or approximately US$1.08 per day. No significant changes in insulin costs were observed in participants following the portion-controlled diet.This new analysis is based on data from a randomized clinical trial published in 2024 in Clinical Diabetes, which compared a low-fat vegan diet to a portion-controlled diet including animal products.Weight and metabolic markersThe previous trial highlighted other health benefits associated with the vegan approach. Participants lost an average of about 5 kg (11 lb) and showed measurable improvements in insulin sensitivity and overall glycemic control. Researchers also reported favourable changes in cholesterol levels and markers of kidney function.The researchers emphasize that these results are important given the continued high cost of insulin in the United States. While prices are lower in Canada, Diabetes Canada notes that out-of-pocket expenses for people living with type 1 diabetes can reach $18,306 per year in some parts of the country.“As insulin prices continue to rise, people with type 1 diabetes should consider a low-fat vegan diet, which may help improve their insulin sensitivity and reduce the amount of insulin they need, potentially saving them hundreds of dollars a year,” says Dr. Hana Kahleova, lead author of the two studies and director of clinical research at the Physicians Committee.Reference:Kahleova H, Maracine C, Znayenko-Miller T, et al. Can a vegan diet help people with type 1 diabetes save on insulin? A secondary analysis of a 12-week randomized clinical trial. BMC Nutr. 2025 Oct 14;11(1):188. doi: 10.1186/s40795-025-01175-2

Type 1 diabetes: low-fat vegan diet associated with reduced insulin needs

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