Whilst on tarceva, (erlotinib) is there a specific diet you need to follow?

Grapefruit: Grapefruit and grapefruit juice should be avoid while taking tarceva (erlotinib) as it can change the level of an enzyme in the body and thereby increase the amount if tarceva (erlotinib) in the body. It also should be taken in an empty stomach as food increases it's absorption and timid hard to maintain a constant dose in the blood if it is taken with different amounts or types of food.