Cook Book Recommendation?

Hi there…new to this forum. Appreciate all the advise I’ve already read. Can anyone recommend a crockpot cookbook that caters to a healthy heart diet? My friend had a heart attack at 33 years old. He was doing so well with diet and exercise but over the past year he seems to have “slipped”. I’m trying to help him get back on track. We desparately need recipes that will ensure he has something good to go home to with healthy leftovers for the next day’s lunch.