What are unsaturated fats and where are they primarily found?

Unsaturated fats are a type of dietary fat that contains one or more double bonds in their fatty acid chains. This structural characteristic is significant because it influences the physical properties of the fat, making unsaturated fats typically liquid at room temperature, as opposed to saturated fats which tend to be solid.

The primary sources of unsaturated fats are plant oils, which include olive oil, canola oil, and sunflower oil, as well as nuts, seeds, and avocados. These fats are known to be beneficial for heart health when consumed in moderation, as they can help reduce bad cholesterol levels and lower the risk of heart disease.

In contrast, the other choices refer to either types of fats that do not have the same chemical structure as unsaturated fats or are sources that are less relevant to the classification of unsaturated fats. Therefore, the affirmation that unsaturated fats contain double bonds and are predominantly found in plant oils is accurate and reflects their health benefits and nutritional importance.