Kate Middleton is known for keeping in shape with regular exercise and a healthy balanced diet, including her go-to lunch dish of watermelon salad. So it came as a surprise when the Princess of Wales revealed during a recent chat with a 109-year-old nursing home resident that they shared a favourite food - kidneys. The 41 year old royal was on a solo engagement at the Oxford Nursing Home in Slough when she got chatting to Nora, alongside her grandchildren Lynne and John.