Whether it’s ridiculous or not is entirely dependent on your budget and tastes.
you appear to want to do something to reduce it it seems.
in which case - look at what you need to cook for the week, plan the meals, shop with a list, change your recipes, learn budget cooking, shop yellow stickers, pantry and frozen and look at the zillions of mumsnet threads on budget groceries and food.
FYI we are 2 adults, 2 under 6, and a dog. It’s £50 a week at Tescos including nappies and the odd cleaning item. We both work FT but I am if I may say so - a very inventive cook who thoroughly enjoys cooking made up and standard foods including from my country of origin - and I’ve got meal planning and creative cooking down to near perfection (!). So that small budget does really work with us. We always shop at tescos, always just once a week, always go at yellow stickers times and always begin the trolley with whatever is on the reduced isles and build the plan around that. it also helps that there’s no alcohol included as we rarely drink - few times a year if we go out.
Our household income doesn’t necessitate thrift thankfully - but we have shoved all we’ve got into massive mortgage overpayments to facilitate a significant upsizing in a few years time and cut back on numerous fronts. Thrifty food shopping and cooking was an unintended by product of this.