From the moment that a human egg is fertilised, interactions between DNA and nutrients supplied through the placenta interact to make substances that make more cells or carry out functions in the developing embryo. This interaction is continued right through our lifespan to maintain our health. Barring accidents, things go wrong when one of three things occur:
- There are mutations in our genes, often called "genetic predispositions" that mean that a mutated gene cannot carry out it's function properly.
- There are inadequate nutrients to allow the genes to carry out their functions.
- There are environmental toxins that damage cells or block the interactions between genes and nutrients.
Your brain never switches off, it is working and consuming energy even when you are asleep. It is responsible for regulating your breathing, heartbeat, senses, thoughts and movements. Hence, it requires a constant supply of nutrients for fuel, all derived from the foods that you eat.