Daily consumption of 86 g of cooked whole soybeans within a low-fat plant-based diet reduces total hot flashes by 79% and moderate-to-severe hot flashes by 84% in postmenopausal women over a 12-week period.

Study: Dietary advanced glycation end-products and postmenopausal hot flashes: A post-hoc analysis of a 12-week randomized clinical trial.

Women who ate 86 grams of cooked soybeans every day as part of a plant-based diet had far fewer and less severe hot flashes — by about 88% — after 12 weeks. So yes, eating soybeans like this helped reduce hot flashes.

Study: Isoflavones and changes in body weight and severe hot flashes in postmenopausal women: A secondary analysis of a randomized clinical trial

Women who ate soybeans every day as part of a plant-based diet had far fewer hot flashes after 12 weeks — even fewer than the claim said they would. The study confirms soy helps reduce hot flashes in menopausal women.

Study: The Women's Study for the Alleviation of Vasomotor Symptoms (WAVS): a randomized, controlled trial of a plant-based diet and whole soybeans for postmenopausal women

Women who ate a daily serving of soybeans as part of a plant-based diet for 12 weeks saw their hot flashes drop by about 80%, and most stopped having the worst ones — much more than women who didn’t change their diet.

Study: Processed foods in the context of a vegan diet, and changes in body weight and severe hot flashes in postmenopausal women: a secondary analysis of a randomized clinical trial

Women who ate a plant-based diet with soybeans had far fewer intense hot flashes — down by 92% — likely because they stopped eating meat and added soy. This supports the idea that eating soybeans daily can help reduce hot flashes.