What happens if i ignore my food allergies to gluten, corn and rice

You won't feel well: If you have celiac disease eating gluten results in gut pain, bloating, diarrhea, & inability to absorb nutrients leading to starvation & dangerous weight loss. The allergic mechanism of allergy to corn & rice is different than gluten. Symptoms vary from nausea & vomiting to hives, difficulty breathing & even anaphylaxis, a life-threatening allergic reaction. Kids, don't try this at home.

If you ignore: An allergy and do that which brings it about then you would get the reaction the allergen causes. Why would you want to do that?

Hard to say: You did not explain how you decided you have these allergies. Many blood or skin allergy tests are poor predictors of how your body would react to a food. They are more a guide to what may be problems. If you have anaphylaxis to a food, it could kill you. If you have true celiac disease, it can injure your gut. If you post more information we can provide better information.