What does the Duchess of Cambridge eat? The short answer is: pretty much everything – just not all in the same day. Countless stories have been crafted about how much or how little she consumes, with speculation about her diet and assorted far-fetched theories about how she retains her slim physique. However, just a little digging reveals exactly what kinds of food the duchess likes, and – surprise! – it’s pretty much the same as the rest of us.