Fractures now cause more hospitalizations than heart attacks, strokes, and breast cancer combined
As populations age and the burden of osteoporotic fractures quietly surpasses that of heart attacks and strokes combined, science turns toward the gut as an unlikely ally in the preservation of bone. A $3 million federal grant has set in motion an 18-month clinical trial testing whether a synbiotic medical food — a carefully designed blend of probiotics and prebiotics — can slow the bone loss that claims so many older women's independence and, too often, their lives. Led by researchers at Harvard, Tufts, and Maine Medical Center, the study asks whether nourishment itself might accomplish what medication alone has not.
- Osteoporotic fractures now send more Americans to the hospital than heart attacks, strokes, and breast cancer combined — a quiet epidemic hiding in plain sight.
- Thirty percent of women do not survive the first year after a hip fracture, and those who do frequently face chronic pain and permanent loss of independence.
- Current prevention strategies — calcium, vitamin D, weight-bearing exercise — have proven insufficient as life expectancy rises and fracture projections climb nearly 50 percent by 2025.
- A federally funded trial will now test SBD111, a synbiotic formulation developed by Solarea Bio, in 220 older women over 18 months to see whether the gut-bone connection can be harnessed through diet.
- If the intervention succeeds, it could offer a safe, food-based alternative to pharmaceutical approaches — and a meaningful reduction in the $25 billion annual cost fractures are projected to impose by 2025.
A coalition of researchers from Harvard Medical School, Tufts University, Maine Medical Center, and biotech company Solarea Bio has secured $3 million from the National Institute on Aging to explore an unconventional front in the fight against bone loss: the human gut. Their 18-month clinical trial will enroll 220 older women to determine whether SBD111 — a synbiotic medical food combining beneficial bacteria with the compounds that sustain them — can preserve lumbar spine bone density as women age.
The stakes are considerable. Osteoporotic fractures already cost the U.S. healthcare system $17 billion annually, a figure on track to surpass $25 billion by 2025. More striking still is the human toll: fractures of this kind now cause more hospitalizations than heart attacks, strokes, and breast cancer combined, and roughly 30 percent of women who suffer a hip fracture do not survive the following year. Those who do often contend with lasting pain and diminished mobility.
Existing guidance — calcium-rich diets, vitamin D, weight-bearing exercise — has not been enough to reverse the trend, particularly as the population ages and fracture projections rise by nearly half between 2005 and 2025. The new trial, led by Harvard's Dr. Shivani Sahni, is designed to test whether a dietary intervention can fill that gap. Should SBD111 prove effective, it would offer older women a food-based means of protecting their bones — and open a new chapter in how medicine understands the relationship between the gut and skeletal health.
A team of researchers across four institutions has received $3 million from the National Institute on Aging to test whether a specially formulated food containing probiotics and prebiotics can slow bone loss in aging women. The 18-month study will enroll 220 older women and measure whether the synbiotic product, developed by a company called Solarea Bio, can maintain bone density in the lumbar spine as women age.
The research addresses a problem that has grown more urgent as the population ages. Osteoporotic fractures—breaks caused by weakened bones—now result in more hospitalizations than heart attacks, strokes, and breast cancer combined. In the United States alone, fractures cost the healthcare system $17 billion annually, a figure projected to exceed $25 billion by 2025. The human toll is severe: roughly 30 percent of women do not survive the first year after a hip fracture, and survivors often face chronic pain and permanent disability.
Currently, the medical establishment offers limited tools for preventing bone loss. Women are advised to eat foods rich in calcium and vitamin D and to engage in weight-bearing exercise. But these recommendations, while sound, have not been enough to stop the rising tide of fractures. As life expectancy increases and the population skews older, the projected number of osteoporotic fractures is expected to jump more than 48 percent between 2005 and 2025.
The new study represents an attempt to fill that gap with a dietary intervention. Synbiotics—combinations of beneficial bacteria and the compounds that feed them—have shown promise in animal studies and small human trials for supporting bone health. The researchers will test whether a specific formulation called SBD111 can maintain bone density in women as they age, and if so, they hope to understand the biological mechanisms at work.
The grant brings together researchers from Harvard Medical School, Tufts University, Maine Medical Center, and Solarea Bio. Dr. Shivani Sahni, an associate professor of medicine at Harvard and director of the Nutrition Program at the Hinda and Arthur Marcus Institute for Aging Research at Hebrew SeniorLife, is leading the effort. She notes that the field has long lacked safe and effective dietary approaches to address the metabolic processes that drive bone loss. If the synbiotic approach works, it could offer women an additional tool—one that works through food rather than medication—to protect their bones as they age.
Notable Quotes
There is an unmet need for safe and effective dietary interventions for the metabolic processes underlying bone loss. Current recommended strategies are limited to consuming a diet rich in vitamins and minerals and performing weight bearing activity.— Dr. Shivani Sahni, Harvard Medical School and Hebrew SeniorLife
Osteoporotic fractures result in more hospitalizations than heart attacks, strokes, and breast cancer combined and cause severe pain, long-term disability, and early death.— Dr. Douglas P. Kiel, Hebrew SeniorLife and Harvard Medical School
The Hearth Conversation Another angle on the story
Why focus on older women specifically? Aren't men affected by osteoporosis too?
Men do develop osteoporosis, but women face a much steeper decline after menopause, when estrogen levels drop. That hormonal shift accelerates bone loss dramatically, making older women a particularly vulnerable population.
So this is a food, not a pill or supplement?
It's classified as a medical food—something between food and medicine. It contains live beneficial bacteria and compounds that feed those bacteria. The idea is that it works through the gut to influence bone metabolism.
What's the actual mechanism? How would bacteria in your gut affect your bones?
That's partly what this study aims to clarify. The gut microbiome influences how the body absorbs calcium and other minerals, and it also affects inflammation and immune function—all of which play roles in bone health. But the exact pathway isn't fully understood yet.
If this works, what changes?
Women would have a dietary option to help maintain bone density without taking osteoporosis drugs, which can have side effects. It's preventive rather than treatment. And if it works at scale, it could reduce fracture rates and the enormous costs—both human and financial—that come with them.
How confident are the researchers that this will work?
They're confident enough that the NIH funded it, but this is still a test. Animal studies and preliminary human data look promising, but an 18-month trial in 220 women will give them real evidence. That's the whole point.