Harvard scientists warn of link between red meat and type two diabetes. Study finds ‘significant link’ between heme iron in red meat and diabetes risk. Reducing red meat intake and moving towards a plant-based diet may lower risk. Study highlights need for healthy dietary choices to prevent diabetes. Consuming heme iron associated with 26% higher risk of type two diabetes. Swapping red meat for plant-based foods may help mitigate risk. Further research needed to understand full impact of iron intake on diabetes risk.ublished by Nature Metabolism.