Not defending your mother-in-law here (because I agree with you that it is a pretty silly and maybe even potentially harmful diet), afaik it wasn’t the diet itself that killed Steve Jobs. It was his decision to do that diet instead of doing actual cancer treatment until it was too late.
>>No jumping off high buildings is perfectly safe as long as you land skillfully.
Not really, because no matter how you spin it, the person in your scenario dies.
However, doing Steve Jobs’ diet might actually be fine (or at least not deadly) for an average person. Only as long as they don’t have late-stage pancreatic cancer and don’t decide to forego chemotherapy treatment.
Which is what killed Jobs, not the diet. For all we know, he might’ve been alive today even if he followed the same diet, as long as he also did the chemo treatment.
Indeed if you're a base jumper with a parachute, you might survive the landing.
Ackshually, this seems analogous to Job's diet and refusal of cancer treatment! And it was the cancer that put him at the top of the building in the first place.