It Starts With Food
This is another book that I have gifted quite a bit to get some friends and family started on a better diet. It Starts with Food is based on the Whole30 protocol from the Whole9 website. The guidelines are very strict if following the Whole30 program but it is useful in given you a good basis for how to eat more so than exactly what to eat. It's also less of a recipe book although there are some base recipes in the back to help things along but they're fairly free form cooking in that you're given base ingredients and it's up to you to spice as needed.