1st Law - Amount
The amount of food should be sufficient to cover the energy requirements of the body and maintain its balance
2nd Law - Quality
The food should be rich in nutrients to provide your body with all the needed substances
3rd Law - Harmony
The amounts of the various nutrients in what you eat must maintain a ratio of proportion to each other
4th Law - Suitability
Must be adjusted to personal suitabilities and needs
- In healthy individuals, preserve health
- In the sick, regain health and support the cure
- In children, ensure growth and development
Furthermore, a healthy diet should be adequate for:
- Individual habits
- Socio-economic situation
- Body function particularities - digestive system and other organs altered by diseases, for example.
More about Pedro Escudeiro: hsl.lib.unc.edu/specialcoll...
healthy eating interested in raw eating 
Healthy Eating
Eating healthy when you're unwell?
Any ideas about eating more healthy foods?
Healthy Eating With Severe Food Allergies
