That's a really good idea. Maybe there could be different stages of sickness. For example:
0 - Healthy
1 - Sick (1 bad food eaten, vomiting)
2 - Food Poisoning (2 bad food eaten, dizziness, falling over, vomiting, sleep drain)
3 - Mega Food Poisoning (5 or more bad food eaten, effects amplify, add health drain)