The first step towards health is understanding what to eat. Eating healthy does not have to be complicated. It's so simple & easy! All we have to do is stop eating man-made products and get back to what Mother Nature which designed us to eat - fruits, vegetables, greens, sprouts, nuts & seeds. We just need to be aware of the 4 food principles i.e. of eating living, wholesome, water-rich, plant-based food. These food principles are timeless and universal, which means that they are applicable for anyone wanting to live a healthy, happy & disease-free life.
Lord Krishna, in the Bhagavad Gita states that all embodied souls are working under the control of 3 modes, or qualities of material nature -

The thoughts in our head, the activities we perform, the people we meet, the food we eat can all be classified as Satvic, Rajasik or Tamasik.
Learn more about Satvik here