These threads always go the same way, and end up with a list of meaningless random numbers because everyone has different budgets, household size, priorities, dietary requirements and likes and dislikes.
The ONS publishes well researched actual average amounts for a family of 4, it's something around £100 pw and it is perfectly possible to provide a decent diet on that amount.
It's probably also possible to spend quite a bit less than that if you have access to a cheaper supermarket and eat cheaper food, ie seasonal or frozen fruit and vegetables, eggs, pulses, grains, less meat and/or cheaper cuts without lying or 'forgetting' about top up shops or takeaways and sadly, some people are limited by smaller budgets so that's all they can spend.
But if you're spending significantly more than average, that's also fine if you can afford it, but you should acknowledge that this is likely to include a lot of 'luxury' spend and it therefore doesn't mean that you couldn't reduce the spend if you wanted/needed to or that it's necessary to spend that amount to eat a decent diet.
Most people aren't spending nearly a tenner a week on fancy canned drinks, regular organic soups and chicken breasts or the oft quoted Mumsnet favourite of £3 a time tubs of blueberries for snacks to inhale daily.