Biorhythm traces back to Dr. Wilhelm Fliess. He based his theory on the medical records of his patients, in which he claimed to see coinciding rhythms. About 100 years ago he deduced the physical curve with a period time of 23 days, the emotional curve with 28 days and the spiritual curve with 33 days from the medical data of his patients.
The theory of biorhythm makes the claim that our physical, mental and emotional health is controlled by cycles.
Physical Biorhythm lasts 23 days and controls vitality, the state of the immune system, confidence, strength and endurance.
Emotional Biorhythm lasts 28 days and regulates moods, feelings, creativity and sensibility.
Intellectual Biorhythm lasts 33 days and controls cogitation, learning aptitude and the decision-making ability as well as the capacity of remembering.
It is questionable if such calculations actually reveal anything regarding the form of individual daily life. Some people do not take it seriously and others plan their lives and important events according to these cycles.
The fact that we are influenced by a type of "internal clock" - a biorhythm in the broadest sense -is undisputable. However, many researchers that research biological rhythms emphatically dissociate themselves from Biorhythm according to Dr. Fliess.
Super Immunity: The Essential Nutrition Guide for Boosting Your Body's Defenses to Live Longer, Stronger, and Disease Free, Joel Fuhrman