Disgust is the emotion of rejection. When you smell rotten food, see mold, or touch something slimy, your face scrunches and your stomach turns. That is disgust doing its job. It evolved to keep humans away from germs, parasites, and poison. The yuck feeling is your body saying: do not put that in your mouth, do not touch that, move away.
🦠 EVOLUTION
Disgust likely evolved to prevent disease by making contaminated food and waste feel repulsive.