How does light affect growth hormone?

I'm assuming you mean the sun, which is a massive source of natural vitamin D. When exposed to sun light, your body absorbs the vitamin D through your skin. Your body starts to pump out serotonin and boost your natural production of hormones, like testosterone and HGH. read more

In the tropics, with lots of sunlight and warmth, plants can grow much faster than in colder northern climates, where light levels are also much reduced. the other limiting factor in plant growth, of course, being the availability of water. read more

A protein hormone secreted by the pituitary gland called growth hormone (or "human growth hormone") is a key player in these events. Several factors affect its production, including nutrition, stress, and exercise. In young children, though, the most important factor is sleep. Growth hormone is released throughout the day. read more