My DMIL has a genetic heart disease problem BUT when she was diagnosed with high cholesterol she responded very well to lifestyle advice. She has (we found out last week) been diagnosed as prediabetic. Has been given no lifestyle advice. We went round yesterday (ironically to help them with their will) and were offered a cupcake from a tray of 12. She is an adult and I don't believe in telling grown ups what to do. But I don't think she's been given the correct information to be able to make the right choices. Any advice?