Consumable
Consumable items represent a variety of foods and beverages. Each can be used once and must then be The fallback content to display on prerendering. However,
often have effects that can benefit multiple The fallback content to display on prerendering. If a
is discarded during the The fallback content to display on prerendering step (which is required if playing on The fallback content to display on prerendering), the The fallback content to display on prerendering may also resolve that item's effects (if applicable).
Do you get the effect of a consumable item when other effects cause you to discard it?
No. You have to use the item to get its effect. Though discarding it is part of using it, something else forcing you to discard it does not trigger its use.
SourceIs it allowed to use items mid/during an engage?
No, items cannot be used mid-engage.
Source