The dietary changes for easing rat allergy symptoms mainly involve boosting your immune system, as allergies are your immune system's overreaction to certain substances. Here is a list of foods that you can include in your daily routine to manage rat allergy symptoms.

Foods Rich in Vitamin C

• Citrus Fruits: Oranges, lemons, and grapefruits are high in vitamin C and can help in boosting your immune system.
• Berries: Strawberries and raspberries are also rich in vitamin C.
• Peppers: Bell peppers and chilli peppers are loaded with vitamin C, a potent antioxidant that can help alleviate allergy symptoms.

Foods Rich in Omega-3 Fatty Acids

• Fatty Fish: Opt for fish like salmon or mackerel, as they contain high levels of omega-3 fatty acids which can control the allergic reaction.
• Chia Seeds and Flax Seeds: These seeds are excellent sources of plant-based omega-3 fatty acids.

Foods Rich in Quercetin

• Apples: Apples contain quercetin, a flavonoid that can reduce inflammation caused by allergic reactions.
• Onions and Garlic: Both onions and garlic are rich in quercetin. They not only add flavor to your food but also ease your allergy symptoms.

Probiotic-Rich Foods

• Yogurt: It contains beneficial bacteria called probiotics which can significantly improve immunity.
• Fermented Foods: Foods like kimchi and sauerkraut are rich in probiotics.

Note: Always balance your diet with a variety of foods to ensure that you're getting a wide range of nutrients. In addition to considering this dietary advice, always follow any treatment or medication plan given by your healthcare provider.