How do they know me so well?

I've just completed my first order for online supermarket shopping. As a final thought, I looked through the magazines hoping for a crochet one as I'm starting to teach myself. Anyhow, at the bottom of three pages of magazines, zilch on crochet, but there were several Instant Grey Root Colour Sprays and Magnum Double Chocolate and Strawberry Icecream Sticks. How do they know I haven't coloured my hair since the first lockdown and I've just started a diet to lose my Covid half stone! Resist, resist.......