How to Avoid Food Poisoning During Summer Published on: 7th December 2023 Medically reviewed by: General Practitioner at First Response Healthcare Food poisoning is an illness caused by ingesting contaminated food or drink. Food poisoning symptoms occur when harmful bacteria, viruses, parasites, or toxins in food and drink are ingested and begin to multiply in the digestive system. Food poisoning is a common problem, especially during the summer months when temperatures are high. This creates an ideal environment for bacterial growth. Food poisoning symptoms vary depending on the pathogen. However, the most common symptoms are: