Is Soy Good for Hot Flashes? What Doctors Say About Menopause Relief + Weight Loss Benefits
Plus learn the best way to add soy to your daily diet
Often find yourself suddenly flushed or drenched in sweat? Hot flashes affect about 75 percent of women going through perimenopause or menopause, according to experts at UCLA Health, and they can last as long as 10 years. While hormone replacement therapy can help, there’s been a lot of buzz about whether or not natural remedies like eating more soy ease flushing. So, is soy actually good for hot flashes? We asked doctors to settle the debate.
Is soy good for hot flashes? What the research shows
Years ago, it was thought that soy was either not beneficial for women or could have potentially negative effects, such as increasing breast cancer risk. But more recent research shows no link between soy and an increased risk of breast cancer (in fact, some newer studies suggest soy may even reduce breast cancer risk).
As for soy’s effect on estrogen menopause symptoms, a new 2025 Menopause study found that postmenopausal women between the ages of 40 and 65 who ate a low-fat, vegan diet with half a cup of cooked soybeans each day had 92 percent fewer severe hot flashes and lost about 8 pounds in 12 weeks. Why did a soy-rich, plant-based diet have such a strong effect? Experts have some insights.
“There’s probably a two-part reason this worked so well: the soybeans and the overall plant-based diet,” says Raj Dasgupta, MD, Chief Medical Advisor for Sleepopolis. “Soy is rich in compounds that act like a gentler form of estrogen, which can help calm hot flashes. The low-fat vegan approach also tends to lower inflammation and support healthy weight loss, which may add to the benefit. So you’re getting symptom relief and improved metabolic health at the same time.”
How soy may reduce hot flashes and support weight loss
To understand how soy helps ease hot flashes, it helps to know what causes them in the first place.
“Hot flashes occur during perimenopause and menopause when a woman’s estrogen levels decline,” says Navya Mysore, MD, Medical Director of Women’s Health at Nurx. “One of the roles of estrogen is to regulate temperature through a part of the brain called the hypothalamus. The drop in estrogen levels triggers the hypothalamus, and hot flashes ensue.”
“Soy contains isoflavones, which are a type of phytoestrogen, or plant estrogens, that are structurally and functionally similar to the estrogen found in the human body,” she continues. “As such, they bind to estrogen receptors and carry out many of the same functions of estrogen, like decreasing hot flashes in menopausal women. It is crucial to keep in mind that these phytoestrogens are weaker than human estrogen.”
As noted earlier, the 2025 study also showed that participants lost weight. Our experts offer some possible reasons why.
“Soy is filling, it has protein and fiber, which can help people feel satisfied with fewer calories,” says Dr. Dasgupta. “Some early research also suggests that the isoflavones in soy may help with fat metabolism and blood sugar regulation. And if you’re replacing higher-fat animal proteins with soy, that can naturally reduce your overall calorie intake.”
How to add soy to your diet
Soy comes in many forms, including soybeans, tofu and soy milk. But the type of soy you choose may make a difference when it comes to managing hot flashes and supporting weight loss.
“One should always choose a food product in its most natural, organic state and avoid anything overly processed,” says Andrea Caamano, MD, Head of Medical at The HRT Club. “That same rule of thumb applies to soy. Soybeans are particularly beneficial for managing hot flashes and promoting weight loss, as they are a whole food rich in fiber and protein. Tofu is a decent runner-up, as it is usually lightly processed.”
“However, once we move on to soy milk and soy yogurt, there tend to be additives, sugar and other ingredients, making these products less natural and potentially causing a worsening of hot flashes and weight gain,” cautions Dr. Caamano
So, how much soy do you actually need to eat to reduce hot flashes and boost weight loss?
“Current research shows that 40 to 80 mg of isoflavones daily are effective at reducing the symptoms of menopause, namely, hot flashes,” says Dr. Caamano. “The million-dollar question is, how do we calculate that? That would be two servings a day of a whole soy food source. There are approximately 30 mg of isoflavones in ½ cup cooked edamame and 10 mg of isoflavones in 1 cup of soy milk or soy yogurt.”
Does soy have side effects?
If soy hasn’t been part of your regular diet, you may be curious about side effects. Experts say soy is safe for most women, but there are exceptions to be aware of.
“Soy is safe for most women when eaten in moderate amounts (one to two servings daily), with few side effects beyond occasional mild bloating,” says Dr. Mysore. “Those with soy allergies should avoid it, and women with a history of estrogen-sensitive cancers should check with their doctor, though current research supports soy’s safety when consumed as whole foods.”
In addition, “Anyone who has hypothyroidism must be aware of the timing of when they take their medications and eat a soy product,” adds Dr. Caamano. “Soy can interfere with the absorption of thyroid hormones, leading to a worsening state of hypothyroidism.”
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