A super-fit grandmother has revealed how she maintains her age-defying aesthetic – including a face that could pass for 30 years her junior. Eva Birath, 70, has put her unusually youthful look down to a strict weight lifting routine – as well as a diet that is free from any plant-based food. Her extreme diet includes eating some 800g of meat – the equivalent of roughly four sirloins – a day. Cardiologists have also flagged heart risks associated with such a diet, which is typically high in saturated fat. Last year, US heart doctor Dmitry Yaranov linked a string of heart attacks in his young patients to meat-heavy diets.