When antiretroviral drugs quiet HIV to undetectable levels, they transform lives—but a stubborn problem remains. Even as the virus itself vanishes, damage to the intestinal walls persists, fueling a chronic inflammation that can trigger serious health complications down the line. Now researchers at Tulane University in New Orleans are beginning to understand why, and they've found an unexpected lead: compounds in broccoli and cabbage.
The study, led by Namita Rout, an associate professor of microbiology and immunology at Tulane National Biomedical Research center, examined what happens to the gut in people—or more precisely, in nonhuman primates—whose HIV has been suppressed by long-term antiretroviral therapy. Published in JCI Insight, the research reveals that while the drugs are remarkably effective at silencing the virus, they cannot fully restore two critical types of immune cells: gamma delta T cells and innate lymphoid cells. These are the body's intestinal first responders, normally producing signaling molecules that protect the gut lining and support tissue repair. In treated animals, these protective responses remained reduced, linked to disrupted proteins that orchestrate the immune activity needed to maintain the barrier that keeps the gut stable.
What makes this discovery matter is that intestinal barrier breakdown contributes to the persistent inflammation that people with HIV face even after successful viral suppression. That chronic state of inflammation is linked to aging, heart disease, and other serious conditions—a problem that current medications don't fully solve.
So the Tulane team tested something simpler: food. They gave a small group of animals a broccoli-based supplement designed to increase exposure to indoles, naturally occurring compounds found in vegetables from the mustard family, particularly broccoli and cabbage. After just one month, the results were striking. The animals showed signs of improved gut barrier integrity and shifts in immune cell populations associated with mucosal repair—changes that suggest the body's healing pathway might still be responsive even after years of treatment.
Namita Rout emphasizes the significance: "These findings identify an immune pathway that appears to be important to intestinal health and may help guide future nutritional strategies aimed at improving long-term health outcomes for people living with HIV."
The study is carefully framed. It was limited to a small number of animals, and the researchers are explicit that these results do not yet show that broccoli supplements treat HIV or its complications in humans. But the window they've opened is meaningful. It suggests that a biological mechanism involved in maintaining gut balance—one that antiretroviral drugs alone cannot fully restore—may still be reachable through dietary intervention, even after decades of treatment.
For millions of people living well with HIV but contending with lingering inflammation and its ripple effects, that possibility points toward a future where nutrition and immunology work together in ways we're only beginning to understand.