Define the following word into their simplest meaning

Sure! Here are the simplest meanings for the words you provided:

1. **Circulatory system**: The system in the body that moves blood and nutrients around.

2. **Metabolic**: Related to the processes that convert food into energy in the body.

3. **Phytochemicals**: Natural compounds found in plants that can have health benefits.

4. **Food additives**: Substances added to food to enhance flavor, appearance, or preservation.

5. **Contaminants**: Unwanted substances that can make food or other items unsafe or dirty.