It's one thing to be born blind, but perhaps another thing to lose one's sight due to the consequences of life choices.
By our choices of not just food and exercise, but more broadly of thought and action, we grow stronger or weaker.
We see how poisons build up within if our organs don't continually remove them, is this also true of sin? Does it also leave residual poisons in the physical and spiritual bodies?
Do such poisons also build within just like the byproducts of metabolism and chemistry do?
This seems likely and would explain much of what I've seen and experienced from childhood until now in myself and in those around me.
Just a theory...
Yes a theory. However the truth is only Christ can remove our sin. No diet or physical regimen can purge us of sin.
You do beyond a great disservice to others to tell them that their illness is due to sin in their lives.
You don't know that and you CAN'T know that. That knowledge is for God and Him alone and it's not for you, me, or anyone else to sit in judgment on them and tell them that. You don't have any idea of the amount of damage you can do to the walk of a weak Christian by presuming to be judge and jury for them and telling them stuff like that, or you wouldn't be doing it.
John 9:1-3 As he passed by, he saw a man blind from birth. And his disciples asked him, “Rabbi, who sinned, this man or his parents, that he was born blind?” Jesus answered, “It was not that this man sinned, or his parents, but that the works of God might be displayed in him.
Exodus 4:11 Then the Lord said to him, “Who has made man's mouth? Who makes him mute, or deaf, or seeing, or blind? Is it not I, the Lord?