I suppose this question can be addressed to both males and females, but it would be interesting to know if it varies between the two genders (hormones, etc).
I want to know if shaving body hair (chest, legs, armpit, etc...) or even facial hair (beard) has an impact on the hair in your scalp? Will it deplete the body of nutrients like keratin and vitamins that are needed in keeping a strong, healthy head of hair? Will it accelerate existing hair loss resulting from androgenic alopecia (Male pattern baldness)?
Here is my hypothesis:
Human hair needs nutrients from the blood to keep the follicle healthy. If you shave body hair it will obviously grow back, but this requires nutrients. The same nutrients could have been used to go towards the scalp hair and keeping it healthy and strong. But instead, more of the body's resources are going towards other hairs and as a result will deplete the scalp from nutrients and cause weak limp hair. And if you are already predisposed to hair loss (via genetics), then this will result in an accelerated rate of hair fall.
I am curious to see if anyone has done any research or if there are any studies on this. Obviously there are many swimmers or cyclists who shave their entire bodies and still have luscious strong hair which can only attributed to 'good' genetics and healthy active lifestyles. If anyone has done any research that either supports or disproves my hypothesis, do not hesitate to leave a response!