Most food substances are absorbed in the small intestine.

The amount of the food substance required to provoke a reaction in a particularly susceptible individual can be quite small.

"The love of your life is a food substance?"

L-tyrosine is sold in some stores as a food substance, and experts said it was not likely to be toxic.

Food coloring is added to change the color of any food substance.

Replies: Each food coloring substance is a solution of one or more different chemical substances.

Are there other food substances that work or perhaps work better?

I am not sure what food substances to test.

This applies to other food substances as well.

John knows his opponent is allergic to a food substance.