Nairobi, Sept. 6 -- One afternoon in September 2022, Hellen Wahonya and her husband, Sam Okello, had just returned from a meeting when she suddenly blacked out.

In her book, My Stroke Attack, published in 2022, Hellen describes what happened next in unsettling detail.

"My eyes were bulging, frozen in the state of a glazed stare. My hands were limp. My mouth was misaligned, and I was frothing," she writes.

Her husband assessed her and concluded that she had suffered a stroke. She was rushed to hospital, where doctors began trying to establish what had happened. They asked about her medical history and lifestyle. Hellen had no history of diabetes or depression. She did not drink alcohol or smoke, and she did not eat red meat. In fact, sh...