Food Color Spectrum diet
Chromotherapy
Phytonutrients

Comes from the idea that most of the energy in the world comes from the sun. Further, all foud sources can be categorized in tiers, such as...
First tier: Plants that perform photosynthesis
Second tier: Animals that eat 'First Tier' food sources.

Honoring this principle requirest that you consume first tier food sources that encompass the entire visible spectrum.