>>8751880>>8751882You're thinking of Olestra
https://en.wikipedia.org/wiki/Olestra>Olestra is a mixture of hexa-, hepta-, and octa-esters of sucrose with various long chain fatty acids. The resulting radial arrangement is too large and irregular to move through the intestinal wall and be absorbed into the bloodstream. Olestra has the same taste and mouthfeel as fat, but it passes through the gastrointestinal tract undigested 