Half of the human subjects developed diarrhea after eating three ounces of Olestra potato chips. Other studies showed that even one ounce of chips caused diarrhea and cramps in some people. Proctor and Gamble conducted a survey which indicated that snacks containing Olestra caused no more gastrointestinal problems that regular snacks. So what is it about Olestra that makes it respond in our bodies the way it does. Basically, the physical properties of Olestra are virtually identical to mineral oil, depending on how the specific oil is formulated.
Mineral oil is flushed through our systems without being absorbed.
It is a form of laxative and carries its own warnings about long term use because of its impact on nutrient retention, the risk of becoming laxative dependent, and other health risks. Finally, there is the issue of obesity. No one knows. Artificial sweeteners haven't resulted in a leaner and trimmer nation. This mindset allows us to believe that because a product is fat free we can eat as much as we desire.