Is $8.50 per day too expensive for a simple keto diet?

I came up with a keto diet that costs $8.50 a day without supplements or medical interventions. That is around $250 to $260 a month for food in Canadian dollars, which might be $200 a month in American dollars.

It could be as cheap as $5.00 a day, if I buy my own groceries instead of ordering grocery delivery online since I do not drive.

My dad will not let me eat a keto diet when he is around but I plan on eating keto the next time he goes on vacation.

Is $8.50 per day too expensive for a simple keto diet?
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