If you really want to live a longer life eat every other day. There is no reason to eat food everyday. Our bodies are not designed to eat massive amounts everyday, thats why we have a huge problem with diabetes. We store fat for a reason. We are meant to go long periods of time without food.
Every animal on earth will have their lifespan increased significantly by calorie restriction.
To put it simply eating = aging.
I don't think that eating every 2 days will help live longer. Is your affirmation based on a study? Do you have any links to prove the research?
I think that doing what you've said will only lead to fast weight loss in the beginning and if kept like this, the stomach will get smaller and smaller and will require less and less food which means low nutrients and proteins which leads to an imminent death.
So, your solution for immortality is based on nothing.