To make this a bit more balanced, bear in mind that its the bunging up that caused the gain, not the fruit. Although the fruit may have contributed to the corks creation, its overall calorie content would not have been sufficient for your friend to gain 5lb. She would have had to eat something along the lines of 16000 calories of fruit to actually put on weight due to excessive overeating of the fruit. This is clearly the case because the following week, she lost ALL of that weight and 2 and a half extra lbs on top, presumably, once the cork had popped. So over the two weeks, one eating a lot of fruit, and one a lot less, she actually averaged 3.75lb a week in loss. You cant even begin to suggest that this is a bad thing on that basis.
It is, I find, one of the trickier aspects of SWs plan that the amount of bulky constipating food is quite high. That said, I have gone from a 3-4 times a day girl, to a 2-3 times a week, on the plan, and that to me, is infinitely preferable.
Strong coffee on WI day for the win!