The pituitary gland which is an endocrine gland, comes into play when a person is exposed to red. In just a fraction of a second a chemical signal goes from the pituitary gland to the adrenal glands and Adrenaline is released. The adrenaline courses through the blood stream and produces certain physiological alterations with metabolic effects. The following reactions begin immediately but may not be noticed for a few minutes or even several hours depending on the health of the individual's 'Homeostasis', (the physiological process by which the internal systems of the body are maintained at equilibrium despite variations in external conditions).
Blood pressure will elevate.
Inreased pulse rate.
Rapid breathing.
The Autonomic Nervous System takes over and reactions become automatic.
Taste buds become more sensitive.
Appetite improves.
The sense of smell heightens.

Males become attracted to yellow based reds while females become attracted to blue based reds.

If you are ruled by the color RED, you are outgoing, assertive, vigorous and prone to impulsive actions and variable moods. You feel deep sympathy for fellow humans and are easily swayed. You have a strong sex drive, entertain stimulating fantasies and would get into extramarital affairs if a strong sense of duty did not hold you back from acting on your secret desires. You are an optimist, but you do not desist to voice your complaints or discomforts.

Red increases the appetite. Some expensive restaurants use red table cloths and napkins to increase the appetite by raising the metabolic rate. People on weight-control programs should stay away from red while eating! Red stimulates the sensory nerves, so it benefits the senses of smell, sight, hearing, taste and touch. It activates blood circulation, excites the cerebrospinal fluid and rouses the sympathetic nervous system. Haemoglobin is built with red rays. Red rays produce heat that vitalises and energises the liver, the muscular system and the left part of the brain. Red is excellent as a muscle relaxant for spasms.