HUMAN NUTRITION

Detailed explanation-1: -Humans have about 5 million hair follicles over their body with approximately 100, 000 on their scalp. (approximately 130 scalp hair follicles per cm2). This equates to about 300 – 500 hair shafts per cm2. Each follicle can grow about 20 individual hairs over one’s lifetime.

Detailed explanation-2: -Scientists believe that hair grows about 6 inches per year and the average head has 100, 000 hairs. So, take an average lifespan of 67.2 years. 6 x 100, 000 x 67.2 equal to 40, 320, 000 inches and that is 636 miles or about 1000 kilometres.

Detailed explanation-3: -It’s normal to shed between 50 and 100 hairs a day. When the body sheds significantly more hairs every day, a person has excessive hair shedding. The medical term for this condition is telogen effluvium.

Detailed explanation-4: -I was able to find a number of sources citing the average on the human head to be 100, 000 hairs (sorry I couldn’t find a good source). Multiplying out, we get a total of about 705, 581, 945, 000, 000 human head hairs currently in the world today. You can tell your daughter that’s about 706 trillion hairs!