1. Watch your weight.
2. Eat fewer bad fats and eat more good fats.
3. Eat fewer refined-grain carbohydrates and more whole grain.
4. Choose healthier forms of proteins.
5. Eat plenty of fruits and vegetables but hold potatoes.
6. Use alcohol in moderation.
7. Take a multivitamin for insurance.

Small changes consistently lead to large changes long term.  If you can chose one thing to change in your diet each week, it will lead to healthier eating overall within a few months!