E
If you look at photos of President Obama taken before he ran for president and when he left office, you’ll notice a clear difference: where there used to be only dark brown hair, there is now far more gray than brown. 16 But is stress really to blame? Then why does hair turn gray, even for those whose jobs aren’t so stressful?
17 Once a hair follicle (毛囊) produces hair, the color is set. If a single hair starts out brown, it is never going to turn gray. Your hair follicles produce less color as they age, so when hair goes through its natural cycle of dying and being regenerated, it’s more likely to be gray after age 33.
While stress can’t turn your hair gray, it can cause a common condition called telogen effluvium (休止期脱发). 18 Then the hair grows back so the condition doesn’t cause baldness. But if you’re middle-aged and your hair is falling out and regenerating more quickly because of stress, it’s possible that the hair that grows back will be gray.
The vast majority of people with gray hair have age-related graying. However, sometimes graying hair indicates an illness. Health problems that may be predicted by gray hair include: vitamin B12 shortage, neurofibromatosis and thyroid disease. 19
It is generally acknowledged that when and how your hair becomes gray is mostly influenced by the genes you inherit from your parents. 20 That’s true whether you’re the President of the United States, or someone with a less stressful job.
A. Actually, hair doesn’t “turn” gray.
B. What is it that makes hair turn gray?
C. Moreover, health problems can be taken lightly.
D. It causes hair to lose about three times faster than normal.
E. It seems that the stress of running a country might turn his hair gray.
F. Some researchers also link graying hair to heart disease and low bone mass.
G. Though other factors may play a role, it would be more helpful to look to past generations.
16-20 EADFG
If you look at photos of President Obama taken before he ran for president and when he left office, you’ll notice a clear difference: where there used to be only dark brown hair, there is now far more gray than brown. 16 But is stress really to blame? Then why does hair turn gray, even for those whose jobs aren’t so stressful?
17 Once a hair follicle (毛囊) produces hair, the color is set. If a single hair starts out brown, it is never going to turn gray. Your hair follicles produce less color as they age, so when hair goes through its natural cycle of dying and being regenerated, it’s more likely to be gray after age 33.
While stress can’t turn your hair gray, it can cause a common condition called telogen effluvium (休止期脱发). 18 Then the hair grows back so the condition doesn’t cause baldness. But if you’re middle-aged and your hair is falling out and regenerating more quickly because of stress, it’s possible that the hair that grows back will be gray.
The vast majority of people with gray hair have age-related graying. However, sometimes graying hair indicates an illness. Health problems that may be predicted by gray hair include: vitamin B12 shortage, neurofibromatosis and thyroid disease. 19
It is generally acknowledged that when and how your hair becomes gray is mostly influenced by the genes you inherit from your parents. 20 That’s true whether you’re the President of the United States, or someone with a less stressful job.
A. Actually, hair doesn’t “turn” gray.
B. What is it that makes hair turn gray?
C. Moreover, health problems can be taken lightly.
D. It causes hair to lose about three times faster than normal.
E. It seems that the stress of running a country might turn his hair gray.
F. Some researchers also link graying hair to heart disease and low bone mass.
G. Though other factors may play a role, it would be more helpful to look to past generations.
16-20 EADFG
