My daughter is healthy, regularly eat balanced diet. Once it happened that period of her meals was more than 4 hours and she had exercise in jumping bungy for 15 minutes. Immediately after she got her lips white. She complained by cold feeling in her stomach (might be hungry). She started feeling hungry. After having some food and rest of half an hour she resumed normal state. The main issue is white lips for some point of time. What was that? What is the implications?