Is it permissible for a man to divorce his wife because she became overweight and he dislikes that?
I say to this man; do you not see, if it were you who became overweight, while your wife was slim and dislikes your weight gain, would you be pleased if she requested a Khul’ from you because of an affair that is not completely in your control?
The answer is of course not, and the Prophet - صلى الله عليه و سلم - said:
“None of you will truly believe until he loves for his brother what he loves for himself.”
It may be you who becomes fat in a short period of time, this affair is in the Hands of Allaah the Glorified. There are methods and medical means and otherwise with which a person can help his wife lose weight. But the intelligent individuals amongst the men do not look at such issues, indeed a household is built upon living kindly with each other, and this goes back to piety and manners.
How many a woman who has a fit body and is beautiful but is a calamity to her husband? And how many a woman who is not as such but carries out her husband’s rights and is a good wife to him, and he sees her as a Hoor from the Hoors of the life of this world.
So what must be looked at and considered my brother, is her religion and manners, as for her body, then do not make an issue out of it, especially since this woman has already become your partner. You must fear Allaah concerning your wife, and you must seek the causes that would help her lose weight, I ask Allaah to grant you and the rest of the Muslims success and steadfastness.