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But its purely biological if most don't.
You can still look pretty but they might not have that biological attraction simply because a heavier woman isn't as well suited to bear children.
Overweight women have a significant heigher rate of still births.
But then we also have cultural influences.
In countries where there is an lot of poverty and malnutrition.. Large curvy women are considered attractive.
So culturally in the west as obesity rises - the opposite (healthy/fit) is considered a beauty ideal.1