Data Validation question regarding OFFSET

Hello,

I hope this is easy to understand:

I am trying to prevent a user from entering data into specific worksheet cells, by setting up criteria in a drop-down list and then using Data Validation Custom OFFSET formula.

My Drop-down List contains the following info:

DRINK
FOOD
ACTIVITY
WEIGH-IN

I am successfully able to create the OFFSET, using the following formula:

=OFFSET($A$16,0,-3)="WEIGH-IN"

I can also do this in another range of cells for ACTIVITY.

The problem I am having, is that I want to create another OFFSET, in a different column, that can prevent data entry if a user selects either DRINK or FOOD from the drop-down list. Can this be done with an OFFSET formula?

Thank you for any help. I can provide the source, if needed. I am somewhat of a newbie to this site, so hopefully I am following the respected guidelines.