2。To understand the origins of metabolites – Produced by (human) cells – Produced by the things that we eat (the food‐ome) • Plants (wheat, corn) • Fruits (apples, oranges, strawberries) • Vegetables (rice, potatoes, broccoli, peas) • Dairy products, including fermented forms • Meat from other animals • Xenobiotics – Produced by microorganisms in our bodies –合成:治疗学,吸烟,家用化学品