Knowledge N Fact4u

Why don't dark-skinned people get sunburns ? •Dark-skinned people do get sunburns. While it's true that the higher pigment levels that make certain people's skin look dark helps protect against sunlight, the pigments do not block 100% of the light. •The skin pigment melanin is produced by special skin cells called melanocytes to protect the body from the damaging effects of ultraviolet light.  •Higher levels of melanin means less sunburn and less skin cancer. •But even the darkest-skinned person is not protected 100% from sunlight. •A study found that 13% of black women and 9% of black men reported getting at least one sunburn in the past year.  •Furthermore, 38% of Hispanic women and 32% of Hispanic men reported getting at least one sunburn in the past year.  •For comparison purposes, the average value across all ethnicities and genders was 50.1%. While dark-skinned people definitely get fewer sunburns, they still get them.  •When a dark-skinned person g...

Why does chocolate cause acne ? •Chocolate does not cause acne. Acne is caused by overactive sebaceous glands.  •Sebaceous glands are microscopic glands connected to the hair follicles.  •Their job is to secrete skin oil (sebum), which travels up the shaft of the hair and out onto the skin in order to waterproof the body.  •If the glands secrete too much skin oil, the channel along the hair's shaft becomes clogged.  •As a result, a buildup of skin oil and dead cells occurs in the glands and the hair follicle.  •This stagnant, clogged mass just below the skin's surface becomes infected with bacteria and turns into a pimple.  •Sebaceous glands accelerate their secretions in response to high levels of sex hormones, such as present during puberty.  •The causes of acne are therefore: 1) elevated sex hormones, 2) sebaceous glands that are overly sensitive to sex hormones, and 3) the presence of bacteria that take advan...