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Snippet from the article:

Stand up straight! And do something about that hair!” Annoying? Sure. But such parental advice may have made humans what we are today. Because our upright stance, and relative lack of hair, may have enabled our human ancestors to run far and fast enough to capture their prey. So say scientists in the Journal of Human Evolution.

The idea that standing on two legs and shedding all that body hair might have helped early humans keep cool on the African savanna was first trotted out in the late 1980s. But those early models had our ancestors standing still in a gentle breeze. Scientists simply didn’t have the computational power to assess what might happen when those early humans had to up and chase down a meal.

Read the rest — Upright and Hairless Make Better Long-Distance Hunters

The above article is actually a transcript of a podcast. The published model can be found here.

Hi Doctor,

I know everyone is genetically different in their balding patterns, speed, etc. but how long does it generally take for miniaturization to turn a healthy hair folicle into one that can’t grow any hair? Weeks? Months? Thanks!

You are right — everyone is different. The hair you see on top of your head reflects about 1/2 inch per month of growth. Miniaturization can take months or possibly even years to appear.

Is it true that human hair has a predetermined number of cycles? If someone experiences TE or chronic TE are they using those cycles prematurely and causing their hair to thin earlier than it would have?

It is true that life of a hair determines the number of hair cycles you will have. I was bald in the crown by the time I was 45, so my hair there died… and then I had transplants to correct it.

If your hair cycle (from telogen to anagen) is 3 years and you have 10 cycles genetically programmed for that hair, then that hair will die at the age of 30. Although I am making this example sound simple, it is certainly not that simple… but male pattern baldness does probably follow that rule. I do not believe that telogen effluvium changes the hair cycle’s length, but just the telogen phase of that cycle.

Is it a coincidence or not that both my father and my grandfather (his father) went bald, or is it because of the similarities? My father has an overbite (his top jaw is more in front of his bottom jaw), as did his father. My grandfather and father went bald at about the same age, which was their early 20’s, although my father said he noticed hair loss at around the age of 18-19.

My brother who does not share this bite similarity is now 26 has his hair, but has an asymmetric pattern which has been this way since his late teens, and has maybe matured/receded more since then, but he has a healthy head of hair.

I guess my main question is: since I also have this overbite like my 2 bald family members, does this put me at more of a risk of balding because I have a facial feature more like them, or is balding simply not relateable whatsoever to minor facial similarities. I guess my concern is inheriting genetics.

Thanks.

I wouldn’t expect facial features and hair loss to have relation. You can get tested for the balding genes with HairDX and that will give you an idea if you are carrying the gene for balding. It won’t tell you if that gene will express itself (or to what degree, or when)… but it’s something to go on if you’re concerned.

Is there any way whatsoever to determine whether a person will at some point in their lives suffer from male pattern baldness, and if so, would this not eliminate the problem of transplanting people too young (say if they have a naturally high/ uneven hairline etc)

There is a test called HairDX that will tell you if you have the gene (70% accurate), but it won’t tell you when that gene will be expressed… or if it will be expressed at all. So on a predictive basis, the answer is unfortunately no. But if you want to know if you are balding (possibly just a little) then you should see a doctor who is experienced in hair analysis for miniaturization and hair bulk, which this will tell you if the balding process has started in you.

Many young men with a balding dad or uncle or brother are expecting hair loss to happen to them, and these are the patients I can help by telling them what, if anything, is going on in their head. If you have an average hair thickness, you might not see thinning until the hair loss is at 50% of the original density. Coarser haired men will often not detect loss even at 60-70% of their original density and blond men may not detect hair loss or thinning to 80-90% of the hair due to the low contrast between hair and skin color.

Is blood in a person’s stool a possible side effect of taking finasteride?

No. Finasteride does not cause internal bleeding or blood in your stool. In general, blood in a person’s stool can be anything from hemorrhoids to cancer. I would follow up with your doctor.

In response to a recent post about stress hair loss vs genetic causes:

Dr Rassman,

What if it’s both? Then does it take one year still to see atleast a little reqrowth? You say a year, but in other posts you have said 6-12 months. Are you talking about how long it takes to first start growing, or how long it will take for the hairs to reach their previous length? Thanks

These numbers of 6 or 12 months are in the ballpark of what we see. It’s an educated guess based upon experience over a long time frame. Either number works, but clearly, if you see regrowth in 6 months then you’re on the lower end of the spectrum. Some may see regrowth sooner than others, but there’s no exact date one can mark on the calendar.

If you have stress induced hair loss AND genetic male pattern baldness, the stress might speed up the existing genetic loss. I really have no way to know if there will be regrowth (or how much) after your stress is under control if you have MPB also at play.

Snippet from the article:

A hat may no longer be the only answer for baldness. Researchers at Yale University have found new clues to the causes of hair loss in the fatty skin cells of mice.

Studying cells from the fatty layer, the researchers found that signals from these fat cells were needed to stimulate the stem cells at the base of hair follicles, which are dormant in baldness. These cells could help scientists identify how to treat hair loss in humans.

“The fat cells are important for hair growth. If they’re not there, the hair won’t grow,” said Valerie Horsley, the lead author of the study.

Horsley said her team will now work on identifying the cells in humans that do the same thing.

Read the rest — Going Bald? The Fault May Lie in Your Cells

It’s another mice study, but it’s at least a place to start. As the article points out, hopefully it’ll lead to new discoveries not only for hair loss, but wound healing and skin tumors.

Snippet from the article:

Heredity has been blamed as one of the main causes of hair loss but a recent study found that, for about half of those going bald, genes have nothing to do with it.

The Korean Hair Research Society traced the family records of 1,220 people suffering from hair loss and found that only 41.8 percent of their fathers had the same problem. About 47.1 percent seemed to have been affected by their father’s genes and about 10 percent are assumed to have been affected by both of their parents, but neither appeared relevant in 41.8 percent of cases. The team tracked the hair loss status of the subjects’ parents and grandparents.

Read the rest — Hair loss not as hereditary as believed

If the Korean Hair Research Society just looked at parents and grandparents, it might not tell the whole story since the genes for hair loss can skip generations. The article does go on to say that stress, extreme dieting, and some medications can cause hair loss… which I don’t think is a surprise to anyone that reads this site regularly.

Unfortunately, I don’t know that these percentages can be applied to a larger population, as I haven’t even seen the actual study. There’s no information on where or if this study was published, but even so, the numbers just don’t sound right to me. Though certainly there is a percentage of hair loss cases caused by factors other than genetics, I still believe the vast majority are cases originate from somewhere in the family tree.

Is it possible that if you are one of the people who didn’t respond to propecia that your hairloss is unrelated to DHT? I’ve read the Diffuse AA can look like diffuse patterned baldness and even chronic TE can end up looking like thinning on top. I’ve tried propecia for a long time now coming up on 16 months and my hair on top is gradually thinning.

a little background for you, I have lived with anxiety, stress and depression problems for a long time and think that having these problems chronically has lead to hair thinning. I only have slight recession in the temples but everything else is evenly thinning on top. In summary, for the 10 percent or so that Merck reported as not responding, could they have hairloss unrelated to DHT? Thanks.

As you suggested, there are many causes of hair loss that are not DHT related. I have no way to know the reasons for your hair loss, though. That being said, there are patients with genetic hair loss that just do not respond to Propecia and this can be tested for with the HairDX Finasteride Response test (written about before).

You need to get a proper diagnosis from a good, caring doctor. I can not help you without examining you, at which point I could map your scalp and conduct a hair bulk analysis in our office.