i used avoir envie as it is a wish, a desire. question not say it was a medical necessity which would be avoir besoin de;
that was my understanding of difference between the two, is that not right?
The example about losing weight in the Kwiz is -
So it is clearly 'a besoin de', you cannot rewrite the text as this is not a free speech exercise.
Hope this helps!
I believe that "avoir envie de" is less strong than "avoir besoin de" in the sense that "envie" takes the meaning of "fancy doing something" whereas "besoin" suggests a "need" so I'm inclined to agree with your analysis of the two expressions.
Hope this helps,
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