The three claims I will research involve the claim that sunglasses cause sunburn, due to the fact that less melanin is produced. The claim that tanning beds cause birth defects during pregnancy. And the claim that people should check their cholesterol in the summer. Do sunglasses cause sunburn? Skin color changes in response to sun exposure. The pituitary gland is the trigger that produces hormones that produce melanin. Dr. Maolem says that if you wear sunglasses, much less sunlight reaches the optic nerve, which in turn tricks the pituitary gland into thinking there is less sunlight. So less melanin is produced, causing more sunburn results. Melanin is a substance that gives skin and hair their natural color. Dark-skinned people have more melanin in their skin than light-skinned people. Freckles are concentrated areas of melanin. Ultraviolet light has the effect of burning the skin. Melanin prevents ultraviolet light. Therefore melanin prevents the skin burning effect. Melanin is the determinant of skin color. It is found in the hair, eyes and ears. Melanin in the skin is produced by cells called melanocytes, present in the epidermis. It is produced in response to light. It doesn't actually come from any gland, although there is a pineal gland that produces melatonin, although it has no effect on humans. In the retina there are cells that react to light. Although they sense changes in light, they can also influence our mood. It wouldn't affect whether we were burned or not. Ultraviolet light is shorter radiation than visible light. It stands in the sunlight. Once ultraviolet rays penetrate the skin, they begin to work on the melanocytes. The rays work as a catalyst to increase the production... half of the paper... hypoproteins) increases by 8%. In summer, however, HDL (high density lipoproteins) increase by around 9%. This shows that less healthy foods are consumed during the winter month which causes bad cholesterol. The result of this survey could also be due to the fact that many people do not exercise as much in the winter as in the summer. People need to check their cholesterol level in the summer to see if they have gained high or low cholesterol. The finding that sunglasses cause sunburn was true. In fact, they cause sunburn by deceiving the eyes. Tanning beds cause birth defects due to the use of harmful UVB lights that destroy crucial folate during pregnancy. And cholesterol should be controlled during the summer because people eat fattier foods and exercise less during the winter months..