The two statements that best illustrate the central ideas of the passage are:
1. **Gluten is a general name for protein found in wheat, rye, barley, and triticale.**
- This statement provides essential information about what gluten is and where it is found.
2. **Eating in restaurants or in other people's homes is challenging for people with celiac disease.**
- This statement highlights the challenges faced by individuals with celiac disease, emphasizing the impact of gluten-related dietary restrictions on their social interactions and daily life.