Emerging studies highlight the potential of peanuts and peanut butter to aid blood sugar management, with possible benefits for people with, or at risk of, type 2 diabetes, though natural options remain preferable to processed spreads.
Peanuts and peanut butter are drawing fresh attention from nutrition researchers as potentially useful foods for people trying to manage blood sugar. In a recent report on the topic, EraofLight highlighted emerging studies suggesting that these everyday snacks may help blunt glucose rises after meals and support steadier overnight blood sugar, although they are not a treatment for diabetes on their own.
One of the most notable findings came from Penn State University, where researchers reported in Current Developments in Nutrition that adults with elevated fasting blood sugar who ate about an ounce of peanuts as an evening snack had better blood sugar readings the next morning. The study adds to earlier evidence that peanuts have a low glycaemic index, meaning they tend to have only a modest effect on blood glucose compared with many carbohydrate-heavy foods.
The possible benefit is not limited to whole peanuts. Research published in 2019 found that peanut butter added to a high-glycaemic meal reduced the post-meal rise in blood glucose compared with the same meal eaten without it. Nutrition experts say the explanation is straightforward: protein, fibre and unsaturated fats can slow digestion, which in turn may reduce the size and speed of a sugar spike.
Peanuts are also nutrient-dense, which helps explain why they have been studied in this context. A modest serving provides plant-based protein, fibre, healthy fats and micronutrients including vitamin E, niacin and manganese. Research published in the Journal of Nutrition in 2014 found that adding peanuts to an American Diabetes Association meal plan improved blood lipid levels and increased intake of vitamin E, niacin and magnesium in adults with type 2 diabetes.
There is also longer-term evidence linking peanuts and peanut butter with a lower risk of type 2 diabetes. A large JAMA study found that women who ate peanut butter five or more times a week had a lower risk of developing the disease than those who ate it less often. However, because that research was observational, it shows an association rather than proof that peanut butter itself prevents diabetes.
Other reviews have pointed to a similar pattern. A later analysis published on PubMed found that including peanuts and tree nuts in the diet improved lipid profiles in people with type 2 diabetes, suggesting possible cardiovascular benefits as well. Even so, nutrition specialists caution that commercial peanut butters can contain added salt, sugar and fats, which can undercut some of the advantages. Natural peanut butter and plain peanuts are generally the better choice for people looking to keep a close eye on blood sugar and overall diet quality.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
