While heart disease consists of many conditions, blockages in the artery are the most common. This can prevent blood, and oxygen, from getting to the heart and can lead to a heart attack or death.
Melatonin is generally used for eastward travel only, since westward travel is easier to adapt to naturally, making melatonin unnecessary unless travel spans 12 or more time zones.
A major U.S. study shows that people born between 1965 and the late 1990s have an increased risk of developing 17 cancers compared with previous generations.