Consumption of 86 g of cooked whole soybeans daily within a low-fat plant-based diet resulted in an 88% reduction in moderate-to-severe hot flashes in postmenopausal women, compared to a 34% reduction in control participants.

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

Women who ate soybeans every day as part of a plant-based diet saw their hot flashes drop by 88%, while those who didn’t change their diet saw only a 34% drop — so eating soybeans helped a lot.

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 saw their severe hot flashes drop by 92%, while those who didn’t change their diet saw no change. This supports the idea that soybeans help reduce hot flashes.

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 soybeans every day and followed a plant-based diet saw their severe hot flashes drop by 84%, while those who didn’t change their diet saw only a 42% drop. This shows soybeans in a healthy diet really help reduce hot flashes.

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

This study found that postmenopausal women who ate a vegan diet with soybeans had almost all their severe hot flashes disappear—92% fewer—while those who kept eating meat had much less improvement. This matches the claim that soy in a plant-based diet greatly reduces hot flashes.