Final answer:
Both allergies and autoimmune diseases are indeed the result of an over-reactive immune system, with allergies causing the body to react to harmless substances and autoimmune diseases leading to the body attacking its own cells.
Step-by-step explanation:
The statement that both allergies and autoimmune diseases result from an over-reactive immune system is true. Both conditions involve an immune response that is inappropriately strong for the situation. In the case of allergies, the immune system reacts to harmless substances, like pollen or pet dander, as though they are dangerous pathogens. This reaction can cause symptoms such as sneezing, itching, and in severe cases, anaphylaxis. On the other hand, autoimmune diseases occur when the immune system mistakenly attacks the body's own tissues, as is the case with type 1 diabetes or rheumatoid arthritis. While the specific mechanisms and triggers are different, both types of conditions reflect an immune system that is not functioning properly.