I don't think he disappeared for weeks in orchards, but he would reportedly eat only apples for weeks at a time, or carrots. He was a "fruitarian" for a period of time. [1]

And he didn't eat only apples to cure his cancer, but he did choose things like "dietary supplements and juices" specifically to cure his cancer, instead of modern medical recommentations. Which he then regretted when the cancer progressed. [2]

It's not a random coincidence that he named the company Apple. He was really into apples, like more than anybody you've probably ever met.

[1] https://www.nbcnews.com/healthmain/strange-eating-habits-ste...

[2] https://www.forbes.com/sites/alicegwalton/2011/10/24/steve-j...