A good rule of thumb when following a holistic diet; eat the rainbow every day. Eat within season.
As once stated by Hippocrates, “Let food be thy medicine and medicine be thy food.”
No food is taboo, everything in moderation, even butter.
It is important to ensure you are eating enough leafy green vegetables.
And though I personally follow a paleo diet which excludes all wheat and cereals, a holistic diet typically includes whole grains. I think it is up to you if you want to include these food groups.
If you choose not to, it is vital to increase your intake of beans and legumes as well fibrous vegetables such as broccoli and dark leafy greens not only for the nutritional content but to achieve the 45 grams of fiber needed per day.