Aside from the "science" that happens inside the body, has there. Has there been an overall study where you compare the overall life span of a twin? If you are fasting like a 3rd worlder, their mortality rate seem high.
If you're comparing a lifespan to someone in developing areas, meal tempo is probably no more than a footnote compared to inaccessibility of medical care, safe birth, safe food and water, occupational hazards, destabilization and violence, etc.