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For some, bone resorption and remodelling will simply maintain the bones, keeping them strong and healthy. But, for those who develop hair loss, this process will continue to grow certain bones of the skull. This is skull expansion, and is the direct cause of androgenetic alopecia in both men and women. Whether or not you start losing hair is dependent upon your skull shape. For those who go completely bald, a very pronounced "domed" skull shape will eventually develop as you can see from the photo below on the left. The curvature that you can see is what causes this type of hair loss, and can often make the scalp feel itchy and very "tight". But, for those who never lose their hair and continue enjoying healthy hair growth throughout life, a very flat, broad forehead and flat crown to the skull is nearly always present. This often gives a distinctive "square" outline to the face as you can see from the photo below on the right. ![]() The extent to which you lose hair depends upon the extent to which your skull grows. Obviously, this means greater* skull expansion will lead to greater loss of hair.
I believe these are all very significant questions concerning the hair loss process, and that it’s vital for complete, accurate answers to be provided before any theory can be recognised as the true cause of androgenetic alopecia. But, none of the existing theories can answer these questions! We need answers! Only skull expansion can fully answer all these questions: A1. If you are developing a bald patch at the back, then this due to parietal bone growth. Receding temples are caused by frontal bone growth. And hair loss at both the front and back is caused by skull expansion of both frontal and parietal bone growth. A2. Remnant hair sometimes continues to grow in areas within the scalp that remain relatively free from skull expansion. A3 and A4. Variations in skull shape can account for the different rates of hair loss between the front and back of the scalp (question 3) and why your hair loss could start as early as puberty or much later on in life (question 4). A5. DHT stimulates both hair growth and bone growth. This, along with certain other hormones and the genetically inherited charactesristic of skull shape is what causes skull expansion. Please note that only very brief answers are given here. But, for a full, illustrated explanation, read: "Skull Expansion - True Cause of Genetic Hair Loss" This skull expansion ebook is completely free to download - Read it and it will prove to you that skull expansion is the real reason for hair loss in both men and women. Read Skull Expansion Ebook - Click Here. Hormones and skull expansion This section reviews two hormones that affect skull expansion. DHT is the hormone mostly responsible for skull expansion, but others including insulin, thyroid and parathyroid hormones also promote the bone remodelling and resorption process. And, as such, they too can contribute to androgenetic alopecia. 1. Dihydrotestosterone (DHT) - The reason why many bodybuilders suffer hair loss! Androgens such as testosterone and DHT are steroid hormones. This means they have an anabolic effect on both muscle and bone formation. In other words, they make bone grow! This explains why intense weight training has been linked to male pattern baldness. For bodybuilders, hair loss is an occupational hazard - intense weight training increases DHT production, which will build both muscle and bone. The entire skeleton can experience new bone growth as a direct result of weight bearing exercises. This means that it’s possible for the rate of bone remodelling to increase in other parts of the body (including the skull) and not just in those areas being exercised (like the arms and legs). Taking anabolic steroids can also contribute to male pattern baldness. The vast majority of anabolic steroids break down to form DHT at some point. So, by taking them, the rate of muscle and bone growth, and the rate of hair loss, can all increase! 2. Insulin – Read this and you won't enjoy junk food so much! Whenever you eat junk food, your blood insulin levels increase (to deal with all that sugar). And if you consume too much junk on a regular basis, over time this could cause insulin resistance and ultimately diabetes. And diabetes has been linked to androgenetic alopecia. As well as stimulating bone growth, insulin also increases DHT production. If insulin levels are high, then Sex Hormone Binding Globulin (SHBG) levels decrease. SHBG is a glycoprotein that binds to testosterone, preventing it from circulating free in the bloodstream. And since it's this "free" testosterone that gets converted into DHT, if insulin levels can be kept low, then SHBG levels will remain high and so help reduce DHT production. There are of course other (healthy) types of food that reduce DHT: Avocados Olive oil Soya products Pumpkin seeds Green tea Learn more about the foods that reduce DHT. How to stop hair loss and regrow your hair...
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