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A phytochemical is a beneficial compound found in plants that contributes to the health benefits associated with fruits, vegetables, herbs, and other plant-based foods. These compounds are secondary metabolites of plants and are not classified as vitamins or minerals, which means they are not essential for basic human survival. However, phytochemicals can have powerful antioxidant, anti-inflammatory, and immune-boosting effects, which can improve overall health and may help reduce the risk of chronic diseases.

They play a significant role in plant defense mechanisms and can also contribute to the color, flavor, and aroma of food. Research has revealed many potential health benefits of consuming phytochemicals, which is why diets rich in fruits and vegetables are often recommended for their health-promoting properties.

The other options represent terms that either do not correctly define phytochemicals or refer to products and nutrients that are not derived from plants.