In the late summer of 2011, Venus Williams won her opening match at the US Open and then, two days later, withdrew before the second round. The reason she gave was not an injury. She had been diagnosed with Sjögren’s syndrome, an autoimmune disease that attacks the body’s moisture-producing glands and leaves many patients too drained to get out of bed. She was 31, a former world number one and seven-time Grand Slam singles champion, and the diagnosis had arrived only after years of mysterious fatigue that no doctor had managed to name.
What kept her on the WTA tour for more than a decade longer was not a new drug. It was a conversation with her younger sister Serena about what she was eating.
The diagnosis that almost ended her career
Sjögren’s syndrome is one of the most prevalent autoimmune diseases in the United States, with the Sjögren’s Foundation estimating that four million Americans live with it, the overwhelming majority of them women. The immune system mistakes the body’s own salivary and tear glands for foreign invaders and slowly destroys them. Dry eyes and a parched mouth are the textbook symptoms, but for many patients the worst part is something harder to photograph.
The fatigue. A weight that settles into the joints and refuses to lift.
Williams has described an exhaustion so heavy that ordinary movement could feel like an enormous effort. There is no single diagnostic test for the condition, which is part of why it had taken her years to get an answer. Patients often cycle through rheumatologists, ophthalmologists and dentists before someone connects the pattern.
By the time she went public in 2011, she had been losing matches she might have won and withdrawing from events she had committed to. She has spoken about mornings when the fatigue made it hard to get out of bed at all.
What the disease actually does
The glands go first. Then the tissue around them inflames. Then the inflammation can spread, to joints, to the digestive tract, sometimes to the lungs and kidneys. Sjögren’s is also highly variable: there is no single course the disease follows, and two people with the same diagnosis can have very different experiences. One patient might have mainly dry eyes. Another might be bedridden.
Williams was the second kind.
For a professional athlete whose career depended on sub-second reaction times and the ability to recover between three-set matches in punishing summer heat, the outlook was bleak. Most players diagnosed mid-career with a systemic autoimmune disease retire. Williams was a seven-time Grand Slam singles champion who had won Wimbledon five times. The conventional wisdom was that she was finished.
The sister who changed the conversation
Serena Williams had been training and traveling alongside her sister since they were teenagers practicing on public courts in Compton. The two had met in nine Grand Slam finals. They shared coaches, hotel rooms and much of the same circle.
After the diagnosis, Serena was the one who pointed Venus toward a change the tour was only beginning to talk about: a raw, plant-based diet. The specifics shifted over time, sometimes described as raw vegan, sometimes as what the sisters jokingly called “chegan,” a cheating-vegan approach that allowed the occasional piece of fish or cooked food. The core idea was cutting out dairy, refined sugar, processed flour and most animal products.
The science linking diet to autoimmune disease was, and remains, contested. But lifestyle and dietary change has become an active area of clinical research as an adjunct to conventional treatment for chronic autoimmune conditions, particularly for managing inflammation and fatigue.
For Williams, the change was dramatic enough to be visible from the stands.
What happened next
She took roughly seven months off and returned to competition in 2012. The comeback started slowly, with early-round losses, and for a while it looked like the gradual fade everyone had predicted.
Then it didn’t.
She worked her way back into the second weeks of major tournaments. In 2017, at 36 and then 37, she reached the final of the Australian Open and the final of Wimbledon. She lost both, one to her sister and one to Garbiñe Muguruza, but she had done something almost no athlete with a serious autoimmune diagnosis had managed. She had returned to the very top of her sport.
She kept playing. She entered tournaments in 2022, 2023 and 2024, including doubles in Miami in early 2024 at the age of 43. After a long break, she returned again in 2025 and carried her comeback into 2026, more than a decade past the diagnosis that was supposed to end her career.
Why the diet mattered, and what it couldn’t fix
Williams has been careful in interviews not to oversell the dietary change as a cure. Sjögren’s has no cure. The disease was still there. She still had flares, and she still pulled out of tournaments. But the daily floor of her energy, the baseline she could count on when she woke up, lifted enough that training became possible again.
She launched a plant-based protein company, Happy Viking, in 2020, partly to make the kind of products she had been improvising in her own kitchen available to other people. She has consistently framed the diet as one part of a broader management strategy that also includes medication, rest and careful scheduling.
Within families, the people closest to a patient often shape how a chronic illness gets managed day to day, sometimes more than any single appointment with a physician. The Williams sisters are an unusually visible example of a pattern that plays out in millions of households: a relative notices something, suggests something, and the patient, exhausted and frightened and ready to try anything, listens.
The sibling effect, scaled up
Psychologists have increasingly come to see the influence siblings have on each other as powerful and long-lasting, shaping identity, behavior and even physical and mental health in ways that long went underappreciated. Siblings share genetics, history and a peer-level trust that doctors rarely match. When Serena suggested the dietary change, she was not a celebrity dispensing health advice. She was a sister who had watched Venus struggle to lift a racket.
That distinction matters. People managing a chronic, life-altering diagnosis often do better when they have a close advocate willing to track symptoms, push back on bad days and notice patterns the patient is too tired to see for themselves.
Venus had Serena.
What her career looks like in retrospect
The numbers, viewed from 2026, are hard to absorb. Williams turned professional in 1994, the year Netscape was founded. She won her first Grand Slam singles title at Wimbledon in 2000. More than three decades later she is still entering tournaments, carrying an autoimmune disease that, in most patients, tends toward progressive decline.
She holds 49 WTA singles titles and four Olympic gold medals, and she spent a combined 11 weeks ranked world number one in singles. Much of that was built before 2011. What the years since have added is rarer still: a top-level career that refused to end on schedule.
And the part that came after 2011 is hard to separate from the conversation with her sister.
The fact that lingers
Sjögren’s syndrome takes its name from Henrik Sjögren, a Swedish ophthalmologist who described the condition in 1933 in his doctoral thesis. For most of the century that followed, it was treated almost as a footnote, a dry-eye complaint, mostly affecting older women, not considered especially serious. The understanding of it as a systemic disease capable of leveling a 31-year-old elite athlete is comparatively recent.
Four million Americans live with it. Most of them are not professional tennis players. Most of them do not have a sister who travels with them and notices what they are eating. But the lesson from Venus Williams’s case is not that a raw diet cures autoimmune disease. It doesn’t, and she has never claimed it did. The lesson is that a disease the medical literature once described as career-ending can sometimes be managed into the background, and that the person who notices first is often not the doctor.
She is still on tour. She is 45 years old. The exhaustion that pulled her out of the US Open in 2011 has not gone away. It has been negotiated with, every morning, for the better part of fifteen years.
