The truth is, it’s actually quite common to have sensitivities to multiple foods. Even healthy foods like salmon or watermelon can trigger a food sensitivity. You may be familiar with IgE food allergies (the scary reactions that show up immediately after eating things like peanuts or shellfish). Food sensitivities are completely different. You can have a food sensitivity even when your IgE food allergy test is negative. Your symptom can appear up to 3 days after eating the trigger food