What Is PHS (Primary Health System)?
PHS is the optimal nutrition system in Human Design, based on the Color and Tone of the Design Sun. This isn't a diet in the classical sense — it's the mechanics of how your specific body best assimilates food and converts it into energy.
Ra Uru Hu discovered PHS as a practical tool for beginning the deconditioning experiment. The logic is simple: if the body isn't working correctly due to improper nutrition, the mind cannot be clear, and no authority will function properly.
6 Determination Types
Determination comes from the Design Sun's Color. Each Color has two variants — left (active) and right (passive), giving 12 types:
Color 1 — Appetite
- Left (Consecutive): need to eat the same things at the same times. The body thrives on stable routine. Breakfast at 8, lunch at 1, dinner at 7 — every day.
- Right (Alternating): need variety. Never eat the same thing two days in a row. The body is stimulated by novelty.
Color 2 — Taste
- Left (Open): food should be simple, with minimal ingredients. Mono-meals, simple recipes, clean flavors.
- Right (Closed): complex dishes, many ingredients, complex flavors. The body needs culinary complexity.
Color 3 — Thirst
- Left (Hot): hot food and drinks. The body better assimilates warm food.
- Right (Cold): cold food and drinks. Raw products, salads, chilled food.
Color 4 — Touch
- Left (Calm): need quiet and peace while eating. No TV, no conversation, full attention on food.
- Right (Nervous): need stimulation while eating — conversation, TV, reading. Paradoxically, this improves digestion.
Color 5 — Sound
- Left (High frequency): the body works best when food is paired with high-frequency sounds — classical music, nature sounds.
- Right (Low frequency): low-frequency vibrations during meals — deep voice, bass music, or silence.
Color 6 — Light
- Left (Direct light): eat in bright lighting, preferably daylight. Sunlight stimulates digestion.
- Right (Indirect light): eat in soft, diffused light. Candles, dim light, or even darkness.
12 Cognition Types
Cognition is determined by the Personality Sun's Tone and describes how your mind best processes information:
- Smell (Tone 1) — a "nose" for the right information. Instinctive knowing whether something is correct or not.
- Taste (Tone 2) — "tasting" information. Need to sample a topic before diving deep.
- Outer Vision (Tone 3) — need to see the big picture. Learning through observation, visual materials.
- Inner Vision (Tone 4) — focus on details. Need to "see" within, meditative approach to information.
- Feeling (Tone 5) — learning through tactile experience. Need to "touch," try in practice.
- Sound (Tone 6) — acoustic cognition. Learning through listening, audiobooks, lectures, conversations.
Each cognition also has a left (focused) and right (peripheral) variation, giving 12 types total.
How to Begin the Experiment?
Calculate your bodygraph and pay attention to the upper Variable arrows. Start with Determination — change your eating conditions according to your type and observe changes over 3-6 months. Then add the Cognition experiment.
"PHS is the gateway to deconditioning. Without proper nutrition, the body cannot support consciousness in its correct state." — Ra Uru Hu