Average cost of groceries for single person a month?

$400.00 a month

i not sure i try to stay on a budget

In what country?

I spend about $40-50 a week on groceries. I eat low carb high fat so my diet is expensive. There are times when i have to get extra things, such as "staples" like olive oil, spices, paper products and other things we all have on hand. So at those times it's extra.

Location will play a big part in this
as well as diet

do you live on organic food only in London or New York?
do you cook from scratch?
do you live in tv dinners?
do you grow your own and only need to buy staples?
MUCH too broad to answer without details

Between £20/$25 and £50/$60