Indeed. I was pondering the fact that a lot of things in the experiment that are composed of mostly insoluble fiber, consistently landed on the weight gain side of the spectrum.
I assume this was a windowing flaw, in that the fiber mass was still in the digestive tract a day later, though not-at-all contributing to weight gain after later elimination.
This would also throw off all the data about oils and fats: anything that lubricates your digestive tract will make it seem like you're losing weight that day even if you're not, because other foods eaten at the same time will now get eliminated faster. (Though that really can be of help; food that spends less time in your digestive tract gets less of its nutrients absorbed.)
I assume this was a windowing flaw, in that the fiber mass was still in the digestive tract a day later, though not-at-all contributing to weight gain after later elimination.
This would also throw off all the data about oils and fats: anything that lubricates your digestive tract will make it seem like you're losing weight that day even if you're not, because other foods eaten at the same time will now get eliminated faster. (Though that really can be of help; food that spends less time in your digestive tract gets less of its nutrients absorbed.)