Let's say you are writing a past event of a diabetic patient to a doctor.
"The patient had consumed 1 whole canned juice of 'del monte' pineapple 240ml, which the patient usually consumes just a half of the juice. Also, 1 pc. of rice cake HAD EATEN/HAD BEEN EATEN as her late afternoon snack, before the blood sugar check.
As you can see, the patient had had her juice & a snack before the blood sugar test. But should I use had eaten or had been eaten?