If you are following a ketogenic diet for specific health reasons, you should be aware that accuracy is vital for this diet to work. (ketodietbooks.com)
And there are many other specific health reasons to spay / neuter. (unitedspayalliance.org)
While Jobs did not address specific health reasons, many experts say it's likely that his leave is related to his ongoing treatment for pancreatic cancer. (abcnews.go.com)