observations and reports

The question we all ask when we get to the store, “Do I have enough ________?” Well BettrLife always has an answer for you. As you checkout at any store the items you mark purchased are moved to your pantry. BettrLife starts learning when you buy certain products and how often you replenish those items. Thought auto-magic we can then take those items from your pantry and move them to your shopping list. The more you use it the better it gets! (via BettrLife)

The important part here is getting the usage data right.  Can it be inferred just from inventory?  Or does it also look at meals, assuming people are inputting them…