Insights & Discussion
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.
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.
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Consuming bicarbonate-calcium mineral water, low in sodium, can help manage calcium imbalance and support bone health in perimenopausal women.
2023 Metabolites Supplementing Low-Sodium Bicarbonate–Calcic (Lete)® Water: Effects in Women on Bone and Systemic Metabolism Marino C, Pagano I, Castaldo G, Grimaldi M, D’Elia M, Santoro A, et al.
Clinical Study Menopause Mineral Water Osteoporosis
The study involved 120 perimenopausal women who consumed 2 liters of a specific bicarbonate-calcium mineral water (Lete) daily for six months. This water was chosen because it is rich in calcium and bicarbonate but low in sodium. The study aimed to determine the impact of this water on bone health and overall metabolism. The participants’ urine and blood serum were analyzed using NMR-based metabolomic procedures. These analyses were conducted to assess the effects of the water not only on calcium metabolism but also on the broader systemic metabolism.
The findings indicated that the Lete water effectively compensated for calcium dysmetabolism and supported bone health and integrity in perimenopausal women. While the study primarily focused on bone metabolism, it also provided insights into the potential system-wide metabolic effects of this specific type of mineral water. This suggests that such water could be a valuable dietary supplement for addressing calcium-related metabolic issues, particularly in perimenopausal women.
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.
Changes in gut microbiome associated with a low-fat, vegan diet and cooked soybeans may reduce the frequency and severity of postmenopausal hot flashes.
2023 Complementary Therapies in Medicine A dietary intervention for postmenopausal hot flashes: A potential role of gut microbiome. An exploratory analysis Kahleova H, Holtz DN, Strom N, La Reau A, Kolipaka S, Schmidt N, et al.
Randomised Controlled Trial Gut Microbiota Hot Flushes Low Fat Diet
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.
A combination of soybean germ extract and a probiotic significantly improved menopause-related conditions and mood in an ovariectomized rat model.
2023 Nutrients Anti-Menopausal Effect of Soybean Germ Extract and Lactobacillus gasseri in the Ovariectomized Rat Model Lee SH, Lim TJ, Yun EJ, Kim KH, Lim S
Animal Study Bacillus Menopause Soybean
The study employed an ovariectomized rat model to understand the effects of a combination of soybean germ extract containing 30% isoflavone and a probiotic. The methodology included assessing the effects of this combination on several health markers including body weight, estrogen markers, uterine and bone health, vascular markers, and neurotransmitter levels in these rats.
Once implemented, the combination of soybean germ extract and the probiotic showcased significant improvement in body weight and uterine and bone health of the rats. There were also noticeable effects on the lipid profile, liver function, and vascular markers. Most interestingly, the combination had a positive impact on the levels of serotonin and norepinephrine, indicating potential mood-enhancing effects, which are crucial in managing symptoms post-menopause. This essentially shows the potential of a dietary approach towards menopausal management, especially given the observed benefits without the side effects typically associated with hormone replacement therapy.
Soy protein, bioactive peptides, and isoflavones are generally safe for consumption and may help reduce the risk of several significant health conditions.
2023 PharmaNutrition Soy protein, bioactive peptides, and isoflavones: A review of their safety and health benefits Tan ST, Tan SS, Tan CX
Review Article Cholesterol High Blood Pressure Isoflavone
Methodology: This review followed the Preferred Reporting Items for Systematic reviews and Meta-Analyses guidelines. It began with a sophisticated multi-database search, featuring resources like Google Scholar, Scopus, and others. This search targeted articles published from 2017 to March 2023 and used specific keywords for accuracy. Forty-three articles were handpicked from this process after excluding reviews, conference reports, duplicates, inaccessible texts, and any non-English publications.
Discussion of Results: A thorough examination of the chosen articles resulted in the conclusion that soy proteins, soy bioactive peptides, and soy isoflavones are typically safe for human consumption. Furthermore, it was found that the consumption of these compounds may have beneficial effects, potentially lowering risk factors for ailments such as osteoporosis, various cancers, hypertension, atherosclerosis, and more.
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