There are no known foods that interfere with your ICD. The device responds to your heart’s electrical activity, not to what you eat.
However, diet does matter for your heart health more broadly. Some cardiac medications — particularly warfarin — can be affected by foods high in vitamin K (such as leafy greens), and grapefruit can interact with several heart medications. If you are on warfarin or have specific dietary questions in relation to your medications, ask your GP or pharmacist for advice.