The light we see is as crucial as the food we eat, the water we drink and the air we breathe. This former Harvard Medical School professor reveals how crucial it is to get the right kind of light at the right time of day. At night, our ancestors used fire which is the yellow-red spectrum, and hence had no problems. Learn about the dangers of modern LED lighting, which is full of blue light but has no infrared; it might be bright but this unhealthy 'junk light' disrupts your circadian rhythms and contributes to chronic disease, just as junk food destroys your body. Find out about the importance of the antioxidant melatonin which suppresses cancer.

59-min. DVD