Mixed
Whole soy foods (e.g., soy nuts, tofu) significantly improve glycemic control and reduce blood pressure, whereas purified soy protein isolates or isolated isoflavone supplements often fail to produce these benefits.
To lower blood sugar and blood pressure using soy, prioritize whole soy foods like tofu, edamame, or soy nuts over protein powders or isolated isoflavone supplements. The fiber and other compounds in whole soy are necessary for the metabolic benefit; isolates often fail to deliver the same results.
Closer examination of the available studies suggests that improvements in glycemic control are achieved more frequently with soy foods rather than isolates... a subgroup analysis showed that whole soy, but not purified isoflavones significantly reduced hyperglycemia [95].
Why this rating
Supported by multiple meta-analyses and RCTs showing consistent divergence between whole foods and isolates, though heterogeneity exists.
Source
Beyond the Cholesterol-Lowering Effect of Soy Protein: A Review of the Effects of Dietary Soy and Its Constituents on Risk Factors for Cardiovascular Disease
D. Dan Ramdath et al. · Nutrients · 2017
DOI 10.3390/nu9040324
Related findings · Mixed
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