Answer:
To make pudding that is safe for your friend to consume, you plan to substitute wheat flour for the corn starch in the recipe.
Step-by-step explanation:
Celiac disease is an autoimmune disease where the ingestion of gluten produces damage in the small intestine.
Gluten is a group of proteins (prolamins and glutelins) found in different cereals such as wheat, barley, rye or oats.
Corn starch does not contain gluten, therefore is a great replacement for wheat flour in recipes.