I approach eating using a whole or clean foods approach. This truly is a simple lifestyle to understand and follow.  Clean/whole foods basically includes fruits and vegetables, whole grains and legumes, lean proteins, low-fat dairy, and good fats like nuts and olive oil. I try to avoid processed foods as much as I can. Processed foods are, more often than not, stripped of nutrients and have additives to ensure long shelf-life. I much prefer to keep the nutrients in my body and the chemicals out!
One of my family’s favorite places to go is Whole Foods Market. I love the booklet they put out every other month. The present one has some great ideas on how to eat clean. Check out their Four Pillars of Health and explore some of their other great suggestions too.