Why does some fruit and vegetables feel greasy?

Fruits and vegetables do not naturally feel greasy. If they feel slippery or oily to the touch, it is likely due to the following reasons:

1. Natural Waxy Coating: Some fruits and vegetables, such as apples, cucumbers, and bell peppers, have a natural waxy coating known as the epicuticular wax. This coating helps prevent water loss and protects the produce from mechanical damage during transportation and handling. The wax can give the produce a slightly greasy feel.

2. Preservatives or Coatings: In the produce industry, certain fruits and vegetables may be treated with preservatives or coatings to extend their shelf life and maintain their appearance. These preservatives, such as edible waxes or natural oils, can also make the produce feel greasy.

3. Oil-Producing Cells: Some fruits and vegetables naturally produce oily substances as part of their defense mechanisms. For example, avocados and olives contain high levels of unsaturated fats, which give them a distinct buttery or oily texture.

4. Contamination: In rare cases, fruits and vegetables may come into contact with substances like mineral oil or vegetable oil during processing, packaging, or transportation. Such contamination could make the produce feel greasy.

Overall, if you encounter fruits or vegetables that feel unusually greasy, it's essential to examine their appearance, packaging, and freshness carefully. If you have concerns about safety or quality, it's best to contact the retailer or producer for verification.