Flaxseed combined with low-dose estrogen therapy preserves bone tissue in ovariectomized rats
Bibliographic record
Abstract
In Brief Objective: Flaxseed is rich in lignans and α-linolenic acid, compounds that may promote healthy skeletons. Many postmenopausal women consume complementary health products such as flaxseed or its components in addition to pharmacological agents such as low-dose estrogen therapy for additional support for menopausal symptoms and related conditions. However, their combined effect on bone health is unknown. The aim of this study was to determine the effects of 10% dietary flaxseed, low-dose estrogen therapy, or their combination on bone mineral density, biomechanical strength, and skeletal fatty acid composition in an ovariectomized rat model of postmenopausal osteoporosis. Methods: Ovariectomized rats received (1) basal diet (negative control), (2) 10% flaxseed, (3) low-dose estrogen implant (13 μg, 90 day release), or (4) flaxseed + low-dose estrogen implant for 12 weeks. A sham-operated group was included as a positive control. Bone mineral density, biomechanical strength, and fatty acid composition were measured at multiple skeletal sites. Results: Flaxseed + low-dose estrogen therapy resulted in the highest bone mineral density and peak load at the lumbar vertebrae, with no effect on bone mineral density or strength in the tibia and femur. Flaxseed and flaxseed + low-dose estrogen therapy resulted in significantly higher relative levels of α-linolenic acid and eicosapentaenoic acid and lower levels of linoleic acid, arachidonic acid, and n-6/n-3 ratio in the lumbar vertebrae and tibia compared with all other groups. Conclusion: Flaxseed + low-dose estrogen therapy provides the greatest protection against ovariectomy-induced bone loss at the lumbar vertebrae. Moreover, this study is the first to demonstrate that flaxseed, rich in α-linolenic acid, alters fatty acid composition in the ovariectomized rat skeleton. In this study, the effects of 10% dietary flaxseed, low-dose estrogen therapy, or their combination on bone mineral density, biomechanical strength, and skeletal fatty acid composition in an ovariectomized rat model of postmenopausal osteoporosis were determined. Results show that flaxseed + low-dose estrogen therapy provides the greatest protection against ovariectomy-induced bone loss at the lumbar vertebra
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".