I have two questions:
1. Am I able to retrieve a “custom” exercises that was previously entered in the diary?
2. Am I able to search and retrieve a food item that was previously entered in the Diary in order to find out the last time that food item was consumed?
1. Not at this time.
2. No. The food will come up in your searches but the only way to see the last time you entered that food would to download your data from the profile page account info settings and search for it in that excel file.