money for thought

so i looked through my finances, and these are roughly the numbers i've spent on "Food" this year.

Total food:
$1948.68

Restaurant bills where i've paid for the whole tab on my credit card (and got cash):
$1086.47

Total food that i acutally ate (excluding above):
~ $862.21
This approximates the amount i spent on my credit card at restaurants, but omits whatever cost i actually incurred in the bills above

Total Spent at Trader Joe's:
$155.25

Total Spent at Ralphs:
$299.87

Total Spent at the local groceries (Trader Joes + Ralphs):
$455.12

Total Spent on food, but not at Trader Joes or Ralphs:
$862.21 - $455.12 = $407.09
This estimates the money i spend eating out, but may include other grocery stores

Groceries per week, assuming 22 weeks
$20.69

Restaurants per week
$18.50

hm...is this right? I don't seem to be spending much for food at all. Thus, the effect of cutting weight?