Read the following context and answer the question.
Context: I went to his house and his mom said he only ate a Peach for dinner . When we work together he always has dizzy spells or says " head rush " both of which I know are caused by lack of eating . I feel really bad for him and I would love him to get better , but at the same time I almost like having him around for competition . He knows I have a slightly altered affliction with food but he does n't know how much .
Question: Why did the speaker 's friend suffer a head rush and feelings of faintness after eating only a peach ?
Answer:


They have low blood sugar , due to the lack of a substantial amount of food taken in