most terrifying shopping trip ever

my hands were shaking while i was buying groceries for the kekwick diet. i'm worried, like terrified that if i fuck this up at all, i'll be HUGE! i have not purchased food with that much fat in it forever. and i have to eat it. ack! tuna in oil. brie. champignon. goat cheese. avocado. eggs. and macadamia nuts. that's what i get to eat. now all i need are ketostix. does anyone know where to get those in the US?