Question

read the text.
gluten free: necessary for some, optional for others
gluten is a protein found in wheat, barley, rye, and sometimes oats—
ingredients often used in breads, pastas, and desserts. as a growing number
of people are choosing to avoid gluten in their diets, gluten - free products
have become increasingly popular in grocery stores and on restaurant
menus. after all, some people experience gas, diarrhea, or bloating after
ingesting gluten. for people whose symptoms are caused by mere
intolerance to the gluten protein or a wheat allergy, sidestepping gluten is a
lifestyle choice. but for those with a condition known as celiac disease,
avoiding gluten is a medical necessity.
what is the main focus of the text?
a comparison of celiac disease and gluten intolerance
an overview of celiac disease
why people avoid gluten in their diets

Explanation:

The text first introduces gluten and the popularity of gluten - free products. Then it distinguishes between people who avoid gluten as a lifestyle choice (due to gluten intolerance or wheat allergy) and those who must avoid it as a medical necessity (celiac disease). This shows it is mainly about the reasons why people avoid gluten in their diets.

Answer:

why people avoid gluten in their diets