What sense does Remy rely on to detect spoiled food?

Remy relies on his sense of smell to detect spoiled food.

In *Ratatouille*, Remy is portrayed as having unusually heightened senses of smell and taste. His nose helps him identify ingredients, notice unpleasant or dangerous substances, and distinguish food that is suitable for eating from food that has gone bad. This ability is introduced as part of his unusual relationship with food: unlike the other rats in his colony, he cares about flavor, freshness, and combinations of ingredients.

The distinction matters because Remy uses both smell and taste as a culinary talent. He can sample ingredients and imagine how they will work together, but smell is the clearest answer when the question concerns detecting spoilage. Spoiled food often releases airborne odor compounds, so smelling it can reveal a problem before tasting it.

Another common mix-up is “taste,” since Remy is also an exceptional taster. The film describes him as having a highly developed sense of both taste and smell, but smell is the specific sense associated with recognizing rotten or contaminated food.