1.Real or unprocessed foods: Foods in their most natural state possible.(No partially hidrogenated oils, MSG (monosodium glutamate), preservatives, artificial flavors and colors, corn syrup, etc.)
2. Not using the microwave (Microwave is something that I limit or avoid because I have heard that it may alter the chemical composition of foods to a point of taking away the nutritious benefits of foods or even turn food into something toxic or carcinogenic. I don't know if it is true, but until I know I choose to limit or avoid it when possible.)
3. No refined sugars
4. Browns: Brown rice, brown bread, brown sugar(if any), etc.
5. Lots of vegetables, especially green, leaffy ones, and other nutritious foods like lean meats, chicken and fish.
I think for certain foods there are levels of cleanliness: For example, even though canned foods are not desirable, if it doesn't have artificial preservatives, etc., it may be a good alternative. So instead of choosing the first level -fresh, instead of canned- you(I) may choose a second or third level acceptable alternative.