Two days of oatmeal reduced insulin 40%, benefit lasted a month (type 2 diabetes) – 1903

The Science Behind Oatmeal and Diabetes- July 2026

Dr. Greger, 5 minute video

• "more than a dozen randomized controlled trials found that oats significantly improved both short-term and long-term blood sugar control, in addition to lowering cholesterol levels."
• "several studies have suggested that a few days of eating oatmeal could have beneficial effects for about a month afterward. In a randomized, controlled, crossover trial, not only did insulin needs drop by about 40% in just two days, compared to just restricting calories alone with a hypocaloric diabetic diet, but a measure of long-term blood sugar control taken four weeks later reflected the benefit."
• "If you try an oatmeal diet, your physician should be ready to rapidly deprescribe your blood sugar drugs or else you could become dangerously overmedicated. Oatmeal interventions should not be performed in patients who might have difficulties in reporting symptoms of low blood sugar. The downside of trying oatmeal days is that it may work a little too well, so it must be done under close medical supervision."

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Related in VitaminDWiki

• Diabetes and Vitamin D meta-analyses - many studies
• Take Vitamin D to prevent prediabetes from progressing into diabetes – American Diabetes Association – 2024
• Prediabetes both prevented and treated by monthly Vitamin D, etc.