Rather than only answering mindful questions (either pre-generated or customized) after a meal, you also have the opportunity to record answers right as a meal photo is captured.
To choose which pre-meal questions should be displayed, this can be selected by heading into Profile > Settings > scroll down to More > Meal Q&As > select particular question > turn on the pre-meal toggle > make sure to save at the bottom.
From here, when a meal image is captured, this particular pre-meal question will pop up as well.
(Only available on iOS!)