As per me, food allergy and intolerance in connection with food is totally different terms.
1. Food allergy: A food allergy is an adverse immune response to a food protein.A protein in the food is the most common allergic component.These kinds of allergies occur when the body's immune system mistakenly identifies a protein as harmful.
2. Food intolerance or non-allergic food hypersensitivity is a term used widely for varied physiological responses associated with a particular food, or compound found in a range of foods.
For more information visit: http://en.wikipedia.org/wiki/Food_intolerance
Thanks & Regards,