When you eat an apple, Western science says the apple is broken down into glucose, vitamins, and fiber, which enter the bloodstream.
Ayurveda takes a radically more structural approach. It states that the body is composed of seven distinct tissue layers, called the Saptadhatus (Sapta = seven, Dhatu = tissue).
Nutrition is a sequential relay race. The food you digest today creates a nutrient pool (Ahara Rasa) that must feed each layer in order. The entire process takes roughly 30 to 35 days.
The Seven Layers
1. Rasa (Plasma/Lymph): The fluid ocean of the body. Formed in days 1-5 after eating. Governs hydration and satisfaction.
2. Rakta (Blood): The red blood cells. Formed in days 5-10. Governs oxygenation and the heat of the body.
3. Mamsa (Muscle): Formed in days 10-15. Provides physical strength and the structural covering of the organs.
4. Meda (Fat/Adipose): Formed in days 15-20. Provides lubrication, insulation, and the storage of bulk energy.
5. Asthi (Bone/Cartilage): Formed in days 20-25. Provides the solid structural framework of the body.
6. Majja (Marrow/Nerve Tissue): Formed in days 25-30. Fills the bones and handles communication (the entire nervous system and brain).
7.
Shukra/Artava (Reproductive Tissue): The final, most refined product. Formed in days 30-35. Governs deep vitality, genetic intelligence, and the ability to create life.
The Flaw in the Relay
Each Dhatu has its own "tissue fire" (Dhatu Agni) that cooks the nutrients to create the next layer.
If your digestion breaks down at layer 4 (Fat), the fat tissue will gorge itself, but it will fail to pass the nutrients on to layer 5 (Bone). This is precisely how an individual can be obese (excess Meda Dhatu) but suffer from osteoporosis (starving Asthi Dhatu) and chronic fatigue (starving Shukra Dhatu).
The goal of Ayurvedic medicine is not just to feed the stomach, but to ensure the "relay race" completes all the way to layer 7, producing the ultimate byproduct: Ojas (pure immunity).