ZenMode:
It has nothing to do with the sun. It's because the human body has become imperfect because of inherited sin from the first man, Adam. And nobody said anything about an apple. The Bible did not identify the forbidden fruit.
Adam was told not to eat from
one specific fruit tree but that he could eat from all of the others.
Further, Jehovah God planted a garden in Eʹden, toward the east; and there he put the man whom he had formed.
Thus Jehovah God made to grow out of the ground every tree that was pleasing to look at and good for food and also the tree of life in the middle of the garden and the tree of the knowledge of good and bad.
Jehovah God took the man and settled him in the garden of Eʹden to cultivate it and to take care of it.
Jehovah God also gave this command to the man: “From every tree of the garden you may eat to satisfaction.
But as for the tree of the knowledge of good and bad, you must not eat from it, for in the day you eat from it you will certainly die.”
Adam rebelled against the Almighty and ate of the forbidden fruit. He thereby became imperfect. He failed the test and brought old age, sickness, and eventual death to all of humanity.
That is why, just as through one man sin entered into the world and death through sin, and so death spread to all men because they had all sinned—.