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Changes in gut microbiome associated with a low-fat, vegan diet and cooked soybeans may reduce the frequency and severity of postmenopausal hot flashes.
In this study, 84 postmenopausal women experiencing two or more moderate-to-severe hot flashes daily were randomly assigned to a low-fat, vegan diet with daily cooked soybeans or allowed to maintain their usual diet. Over a 12-week period, the frequency and severity of hot flashes were tracked using a mobile application. In 11 women from the group, gut microbiome was analyzed at the start and after 12 weeks of the dietary intervention, using deep shotgun metagenomic sequencing.
The women who underwent gut microbiome testing experienced a substantial decrease in total hot flashes during the dietary intervention, and severe hot flashes disappeared entirely in this group. Alpha and beta diversity within the microbiome showed no significant difference in the intervention group between baseline and the end of the 12 weeks. Interestingly, adjustments in the relative abundance of certain bacterial strains, notably Porphyromonas and Prevotella corporis, were linked with the reduction in severe day hot flashes, while changes in the relative abundance of Clostridium asparagiforme were associated with a reduction in total severe hot flashes and severe night hot flashes.
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Soybean intake can potentially reduce risks of several cancers, type 2 diabetes, osteoporosis, and hot flashes, and it may negatively impact some drug treatments and cause allergies.
2023 Journal of Microbiology and Biotechnology Benefits of Soybean in the Era of Precision Medicine: A Review of Clinical Evidence Kang JH, Dong Z, Shin SH
Review Article Breast Cancer Hot Flushes Soybean
This research primarily involves review and analysis of current clinical studies focusing on the benefits and risks of soybean ingredients. The method appears to be a systematic review of various epidemiological studies which were investigating the correlation between soybean consumption and the risk of developing multiple types of cancers including breast, prostate, colorectal, ovarian, and lung cancers. Besides cancer, other common diseases such as type 2 diabetes, osteoporosis, and menopausal symptoms like hot flashes were also investigated. Moreover, any potential adverse effects of soybean, including its possible detrimental impact on certain drug treatments and its allergenicity, were also factors of study in these clinical evidences.
In the discussion of results, the researchers found a significant inverse association between soybean intake and cancer risks, wherein an increase in the consumption of soybean foods was associated with a reduced likelihood of cancer. Besides showing potential anticancer properties, soybean consumption was found inversely correlated with risks of type 2 diabetes. Soy isoflavones, compounds present in soybeans, also showed potential benefits in the management of osteoporosis and hot flashes. On the other hand, the adverse effects of soybean, including interference with certain drug therapies and causing allergies, were also duly noted. Therefore, the research concludes that while soybean promises several significant health benefits, caution should be exercised for individuals under specific drug treatments or with allergies to soy.
A diet low in fat, vegan, and inclusive of daily cooked soybeans significantly reduces the frequency and severity of hot flashes in postmenopausal women.
2022 Menopause A dietary intervention for vasomotor symptoms of menopause: a randomized, controlled trial Barnard ND, Kahleova H, Holtz DN, Znayenko-Miller T, Sutton M, Holubkov R, et al.
Randomised Controlled Trial Hot Flushes Low Fat Diet Menopause
The methodology used involved the selection of 84 postmenopausal women who reported at least two moderate-to-severe hot flashes. These women were randomly divided into two cohorts, one prescribed the dietary intervention of a low-fat, vegan diet coupled with daily servings of cooked soybeans and a control group which did not alter their diet. Over a 12-week period, a mobile application was used to track hot flashes in terms of frequency and severity. Further, the participants’ vasomotor, psychosocial, physical, and sexual symptoms were assessed using the Menopause-Specific Quality of Life questionnaire. In some participants, the presence of urinary equol, a compound formed in the gut after consuming soy, was measured following the intake of the specified amount of soybeans for 3 days.
In discussing the results, a remarkable decrease was noted in the frequency and severity of hot flashes experienced by the group assigned the dietary intervention versus those in the control group. In addition, after 12 weeks, half of the participants adhering to the vegan diet and daily soy intake reported complete cessation of moderate-to-severe hot flashes. Furthermore, notable decreases were reported in the intervention group in menopause-specific quality of life domains including vasomotor, physical, and sexual. Neither the season nor the participant's ability to produce equol played a notable role in these improvements.
Equol, a powerful estrogen-like compound derived from soy, could be key to better health in postmenopausal women if gut microbiome could be altered to facilitate its production.
2022 Nutrients Maximizing the Estrogenic Potential of Soy Isoflavones through the Gut Microbiome: Implication for Cardiometabolic Health in Postmenopausal Women Leonard LM, Choi MS, Cross TWL
Review Article Equol Gut Microbiota Isoflavone
The methodology of this research involved looking closely at the properties and actions of equol, a metabolite of the soy isoflavone daidzein. This substance is produced through the process of intestinal bacterial metabolism, but the ability to produce it is not present in over half of the human population due to the absence of specific equol-producing bacteria in the gastrointestinal tract. Given that the make up of the gut microbiome varies from person to person, understanding the effects of equol and daidzein in the human body has been a complex task. Furthermore, the fact that rodents easily produce equol complicates the matter, as findings from rodent models may not directly apply to humans.
While interpreting the results, it was found that equol, due to its strong estrogenic activity, could potentially be an excellent means to manage postmenopausal symptoms and overall health. However, the ability to produce equol varies significantly among people, based on the bacterial microflora of their gut. Therefore, the benefits of equol could potentially be amplified by finding effective methods to manipulate the gut microbiome to foster equol production, a strategy that could lead to improved health outcomes for postmenopausal women.
Isoflavones found in soybeans can reduce risks of certain cancers and alleviate menopause-related symptoms among women, such as vasomotor syndromes, spinal bone loss, and hypertension.
2021 International Journal of Molecular Sciences Utilization of Isoflavones in Soybeans for Women with Menopausal Syndrome: An Overview Chen LR, Chen KH
Systematic Review High Blood Pressure Hot Flushes Menopause
The study overviewed soybeans' chemical composition and focused mainly on isoflavones. The research examined the processes of soybean preparation that includes cleaning, drying, crushing, and dehulling, and extraction methods to derive various soy products, particularly focusing on isoflavones - daidzein, genistein, and S-equol. Various soy products such as refined soy oil, soy lecithin, free fatty acids, glycerol, and soybean meal were discussed, along with the presence of the minor biological constituents in remaining components.
The study explored the relationship between isoflavone consumption and disease prevention, particularly in relation to heart disease, cancer incidence—of the breast, bladder, and endometrial and colorectal—and menopause-related symptoms. The therapeutic effects of isoflavones were studied in the context of vasomotor syndromes, spinal bone loss, hypertension regulation, depressive symptoms during pregnancy, and in vitro glycemic control. In contrast, it failed to find definitive effects of isoflavones on cognition improvement and urogenital symptoms. The inconsistencies in defining the ingredients, doses, study durations, and outcomes of isoflavone studies proved challenging for the research.
Isoflavones, mainly found in soy-derived products, show beneficial effects on bone health, potential cancer risk reduction, and alleviation of menopausal symptoms, but not on cardiovascular risk.
2020 Nutrients Scientific Evidence Supporting the Beneficial Effects of Isoflavones on Human Health Gómez-Zorita S, González-Arceo M, Fernández-Quintela A, Eseberri I, Trepiana J, Portillo MP
Review Article Breast Cancer Hot Flushes Isoflavone
The study examined the potential uses of isoflavones, phenolic compounds mostly found in soy-derived foods and several vegetables. Isoflavones are seen as potential alternative therapies for hormone-dependent disorders due to their near-identical chemical structure to estradiol. These disorders include certain cancers, cardiovascular diseases, and menopausal symptoms. The investigation involved reviewing existing scientific evidence to evaluate the potential effects of isoflavones on these diseases and health concerns.
In assessing the results, the review found evidence suggesting that isoflavones could have a beneficial effect on postmenopausal women's bone health, contributing to osteoporosis prevention and treatment. However, observed study results were not entirely conclusive due to discrepancies among study designs. Contrarily, there appeared to be no significant protective effect against cardiovascular risk with soy isoflavones. In terms of cancer, preliminary observations suggested that isoflavones may reduce some types of cancer risks, such as breast and endometrial cancer. Lastly, isoflavones showed a potential role in reducing hot flushes associated with menopause. Concerning safety, most common adverse effects were mild and observed at the gastrointestinal level.
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