My nan lived to 103. She cooked everything in beef dripping. Her favourite meal was beef potatoes and peas with gravy. Meat and 2 veg. Every day. Bread without synthetic vitamins or seed oils and real butter. She never counted a calorie, never owned a pair of trainers, and never once asked a doctor what she was allowed to eat. Meanwhile I spent my 30s eating low-fat yoghurt and margarine, because a man in a suit on the telly said my heart depended on it. She outlived three doctors who tied to tell her to eat margarine. I trust the woman who made it to 103 more than the people selling me a “heart healthy” spread. What did your nan swear by?