Episode summary
Health and metabolism expert Thomas DeLauer examines RD43, a specially bred Japanese rice variety that produces minimal blood sugar and insulin spikes despite having identical calories and carbohydrate content to regular white rice. DeLauer explains that the key difference lies in the molecular architecture of the starch itself, not the amount of carbohydrates. RD43 was developed through traditional crossbreeding to create a high-amylose rice that forms V-type crystalline structures where amylose wraps around fatty acid chains, making it resistant to digestive enzymes and preventing much of the starch from converting to blood sugar. Two significant human trials demonstrate the rice's metabolic impact: a 12-week study of 34 pre-diabetic individuals showed significant reductions in fasting glucose, insulin, HbA1c, and insulin resistance, plus fat loss that appeared independent of calorie restriction. More dramatically, a clinical therapeutics study of 96 women with gestational diabetes found that only 6 percent of those eating RD43 needed insulin therapy compared to 23 percent eating regular jasmine rice, a 73 percent reduction. Of those in the jasmine group who reached the threshold for needing insulin, 10 out of 11 were able to avoid it after switching to RD43. DeLauer also provides practical guidance for home cooks, explaining how to engineer similar benefits from regular rice through cooking, refrigerating overnight, and reheating, a process called retrogradation that increases resistant starch by approximately 2.5 times. He recommends adding small amounts of olive or coconut oil during cooking to promote formation of protective starch complexes, and suggests aged basmati rice as the closest mainstream alternative to RD43.
