I just do n't know if I want to do it before or after lunch . I feel I could go either way ... but they might tell me to go eat lunch ... but I feel I 'll be too lazy to eat lunch and then go back to donate blood . Soo ... let 's hope it works .
According to the above context, answer the following question.
Why may they tell him to go eat lunch ?


He may pass out if he does n't .