Final answer:
Guests wishing to make substitutions on a life balance menu should ask the restaurant staff as policies may vary, but many establishments are accommodating with potential additional charges or limitations.
Step-by-step explanation:
Most restaurants that offer a life balance menu aim to provide healthier options to their customers. Guests who are interested in making substitutions for dietary preferences, allergies, or health reasons should inquire directly with the restaurant staff. Policies on substitutions can vary greatly from one restaurant to another. It is not uncommon for restaurants to allow substitutions, though there may be an additional charge or some limitations on what items can be substituted. Guests should ensure they communicate clearly with the service staff to make an informed decision.