The proven healthy diet is what we call the "Southern Mediterranean Diet" See http://www.patient.co.uk/health/Mediterranean-Diet-Summary-and-Chart.htm.

Changing from our Western diet to this can greatly reduce your risk of developing heart disease, cancer, and many other diseases. The diet is rich in fruit and vegetables and low in saturated animal fats. Olive oil and oily fish are used in significant quantities. Fibre, including grains is an important part of the diet. Enjoy.

Remember – "You are what you eat"