Food Safety Report: Denny's, 2627 E Colorado Blvd, Pasadena, CA 91107, United States 2 years ago • details 35 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Fever, Chills, Headache Suspected source: Food from here Onset: Less than 4 hours Duration: 12 to 24 hours Sick: Me