Veterinarians at Chicago's Brookfield Zoo overhauled the diet and lifestyle of Jim and Axhi, the zoo's Alaskan grizzlies, because the animals were obese. Cardiologist Barbara Natterson-Horowitz, a leading one health advocate who recounted the bears' story in her book "Zoobiquity," thinks it is one of many examples of the overlap between human and animal health. Physician Peter Rabinowitz says human and animal medicine have much to learn from each other. "There are so many things that vets have discovered that are relevant to doctors in practice, and vice versa," he said.

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