From straight to curly, thick to thin: here’s how hormones and chemotherapy can change your hair
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Head hair comes in many colours, shapes and sizes, and hairstyles are often an expression of personal style or cultural identity.
Many different genes determine our hair texture, thickness and colour. But some people’s hair changes around the time of puberty, pregnancy or after chemotherapy.
So, what can cause hair to become curlier, thicker, thinner or grey?
Curly or straight? How hair follicle shape plays a role
Hair is made of keratin, a strong and insoluble protein. Each hair strand grows from its own hair follicle that extends deep into the skin.
Curly hair forms due to asymmetry of both the hair follicle and the keratin in the hair.
Follicles that produce curly hair are asymmetrical and curved and lie at an angle to the surface of the skin. This kinks the hair as it first grows.
The asymmetry of the hair follicle also causes the keratin to bunch up on one side of the hair strand. This pulls parts of the hair strand closer together into a curl, which maintains the curl as the hair continues to grow.
Follicles that are symmetrical, round and perpendicular to the skin surface produce straight hair.
Mosterpiece/Shutterstock
Life changes, hair changes
Our hair undergoes repeated cycles throughout life, with different stages of growth and loss.
Each hair follicle contains stem cells, which multiply and grow into a hair strand.
Head hairs spend most of their time in the growth phase, which can last for several years. This is why head hair can grow so long.
Let’s look at the life of a single hair strand. After the growth phase is a transitional phase of about two weeks, where the hair strand stops growing. This is followed by a resting phase where the hair remains in the follicle for a few months before it naturally falls out.
The hair follicle remains in the skin and the stems cells grow a new hair to repeat the cycle.
Each hair on the scalp is replaced every three to five years.
Just Life/Shutterstock
Hormone changes during and after pregnancy alter the usual hair cycle
Many women notice their hair is thicker during pregnancy.
During pregnancy, high levels of oestrogen, progesterone and prolactin prolong the resting phase of the hair cycle. This means the hair stays in the hair follicle for longer, with less hair loss.
A drop in hormones a few months after delivery causes increased hair loss. This is due to all the hairs that remained in the resting phase during pregnancy falling out in a fairly synchronised way.
Hair can change around puberty, pregnancy or after chemotherapy
This is related to the genetics of hair shape, which is an example of incomplete dominance.
Incomplete dominance is when there is a middle version of a trait. For hair, we have curly hair and straight hair genes. But when someone has one curly hair gene and one straight hair gene, they can have wavy hair.
Hormonal changes that occur around puberty and pregnancy can affect the function of genes. This can cause the curly hair gene of someone with wavy hair to become more active. This can change their hair from wavy to curly.
Researchers have identified that activating specific genes can change hair in pigs from straight to curly.
Chemotherapy has very visible effects on hair. Chemotherapy kills rapidly dividing cells, including hair follicles, which causes hair loss. Chemotherapy can also have genetic effects that influence hair follicle shape. This can cause hair to regrow with a different shape for the first few cycles of hair regrowth.
Igor Ivakhno/Shutterstock
Hormonal changes as we age also affect our hair
Throughout life, thyroid hormones are essential for production of keratin. Low levels of thyroid hormones can cause dry and brittle hair.
Oestrogen and androgens also regulate hair growth and loss, particularly as we age.
Balding in males is due to higher levels of androgens. In particular, high dihydrotestosterone (sometimes shortened to DHT), which is produced in the body from testosterone, has a role in male pattern baldness.
Some women experience female pattern hair loss. This is caused by a combination of genetic factors plus lower levels of oestrogen and higher androgens after menopause. The hair follicles become smaller and smaller until they no longer produce hairs.
Reduced function of the cells that produce melanin (the pigment that gives our hair colour) is what causes greying.
Theresa Larkin, Associate professor of Medical Sciences, University of Wollongong
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Healthy Hormones And How To Hack Them
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Healthy Hormones And How To Hack Them!
Hormones are vital for far more than they tend to get credit for. Even the hormones that people think of first—testosterone and estrogen—do a lot more than just build/maintain sexual characteristics and sexual function. Without them, we’d lack energy, we’d be depressed, and we’d soon miss the general smooth-running of our bodies that we take for granted.
And that’s without getting to the many less-talked-about hormones that play a secondary sexual role or are in the same general system…
How are your prolactin levels, for example?
Unless you’re ill, taking certain medications, recently gave birth, or picked a really interesting time to read this newsletter, they’re probably normal, by the way.
But, prolactin can explain “la petite mort”, the downturn in energy and the somewhat depressed mood that many men experience after orgasm.
Otherwise, if you have too much prolactin in general, you will be sleepy and depressed.
Prolactin’s primary role? In women, it stimulates milk production when needed. In men, it plays a role in regulating mood and metabolism.
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Insomnia? High blood pressure? Try these!
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Your Questions, Our Answers!
Q: Recipes for insomnia and high blood pressure and good foods to eat for these conditions?
A: Insomnia can be caused by many things, and consequently can often require a very multi-vector approach to fixing it. But, we’ll start by answering the question you asked (and probably address the rest of dealing with insomnia in another day’s edition!):
- First, you want food that’s easy to digest. Broadly speaking, this means plant-based. If not plant-based, fish (unless you have an allergy, obviously) is generally good and certainly better than white meat, which is better than red meat. In the category of dairy, it depends so much on what it is, that we’re not going to try to break it down here. If in doubt, skip it.
- You also don’t want blood sugar spikes, so it’s good to lay off the added sugar and white flour (or white flour derivatives, like white pasta), especially in your last meal of the day.
- Magnesium supports healthy sleep. A fine option would be our shchi recipe, but using collard greens rather than cabbage. Cabbage is a wonderful food, but collard greens are much higher in magnesium. Remember to add plenty of mushrooms (unless you don’t like them), as they’re typically high in magnesium too.
As for blood pressure, last month we gave tips (and a book recommendation) for heart health. The book, Dr. Monique Tello’s “Healthy Habits for Your Heart: 100 Simple, Effective Ways to Lower Your Blood Pressure and Maintain Your Heart’s Health”, also has recipes!
Here’s one from the “mains” section:
Secret Ingredient Baltimore-Style Salmon Patties with Not-Oily Aioli
❝This is a family favorite, and no one knows that it features puréed pumpkin! Most salmon cake recipes all for eggs and bread crumbs as binders, but puréed pumpkin and grated carrot work just as well, lend a beautiful color, and add plenty of fiber and plant nutrients. Canned salmon is way cheaper than fresh and has just as much omega-3 PUFAs and calcium. Serve this alongside a salad (the Summer Corn, Tomato, Spinach, and Basil Salad would go perfectly) for a well-rounded meal.❞
Serves 4 (1 large patty each)
Secret Ingredient Baltimore-Style Salmon Patties:
- 1 (15-oz) can pink salmon, no salt added
- ½ cup puréed pumpkin
- ½ cup grated carrot (I use a handheld box grater)
- 2 tablespoons minced chives (Don’t have chives? Minced green onions or any onions will do)
- 2 teaspoons Old Bay Seasoning
- 1 tablespoon olive oil
- ½ large lemon, sliced, for serving
Not-Oily Aioli:
- ½ cup plain low-fat Greek yogurt
- Juice and zest from ½ large lemon
- 1 clove garlic, crushed and minced fine
- 2 tablespoons chopped fresh dill
- For the patties: mix all the ingredients for the salmon patties together in a medium bowl
- Form patties with your hands and set on a plate or tray (you should have 4 burger-sized patties)
- Heat oil in a large skillet over medium heat.
- Set patties in a skillet and brown for 4 minutes, then carefully flip.
- Brown the other side, then serve hot.
- For the Aioli: mix all the ingredients for the aioli together in a small bowl.
- Plop a dollop alongside or on top of each salmon patty and serve with a spice of lemon.
Per serving: Calories: 367 | Fat: 13.6g | Saturated Fat: 4.4g | Protein: 46g | Sodium: 519mg | Carbohydrates: 13.2g | Fiber: 1.3g | Sugars: 9g | Calcium: 505mg | Iron: 1mg | Potassium 696mg
Notes from the 10almond team:
- If you want to make it plant-based, substitute cooked red lentils (no salt added) for the tinned salmon, and plant-based yogurt for the Greek yogurt
- We recommend adding more garlic. Seriously, who uses 1 clove of garlic for anything, let alone divided between four portions?
- The salads mentioned are given as recipes elsewhere in the same book. We strongly recommend getting her book, if you’re interested in heart health!
Do you have a question you’d like to see answered here? Hit reply or use the feedback widget at the bottom; we’d love to hear from you!
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Revealed: The Soviet Secret Recipe For Success That The CIA Admits Put The US To Shame
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Today’s edition of 10almonds brings you a blast from the past with a modern twist: an ancient Russian peasant food that became a Soviet staple, and today, is almost unknown in the West.
Before we get to that, let’s take a sneaky look at this declassified CIA memorandum from near the end of the Cold War:
(Click here to see a bigger version)
The take-away here is:
- Americans were eating 2–3 times more meat than Soviets
- Soviets were eating nearly double the amount of grain products and potatoes
…and both of these statistics meant that nutritionally speaking, the Soviets were doing better.
Americans also consumed more sugar and fats, which again, wasn’t the best dietary option.
But was the American diet tastier? Depends on whom you ask.
Which brings us to a literal recipe we’re going to be sharing with you today:
It’s not well-known in the West, but in Russia, it’s a famous national comfort food, a bastion of health and nutrition, and it rose to popularity because it was not only cheap and nutritious, but also, you could eat it for days without getting sick of it. And it could be easily frozen for reheating later without losing any of its appeal—it’d still be just as good.
In Russia there are sayings about it:
Щи да каша — пища наша (Shchi da kasha — pishcha nasha)
“Shchi and buckwheat are what we eat”
Top tip: buckwheat makes an excellent (and naturally sweet) alternative to porridge oats if prepared the same way!
Где щи, там и нас ищи (Gdye shchi, tam i nas ishchi)
“Where there’s shchi, us you’ll see”
Голь голью, а луковка во щах есть (Gol’ gol’yu, a lukovka vo shchakh yest’)
“I’m stark naked, but there’s shchi with onions”
There’s a very strong sentiment in Russia that really, all you need is shchi (shchi, shchi… shchi is all you need )
But what, you may ask, is shchi?
Our culinary cultural ambassador Nastja is here to offer her tried-and-tested recipe for…
…Russian cabbage soup (yes, really—bear with us now, and you can thank us later)
There are a lot of recipes for shchi (see for yourself what the Russian version of Lifehacker recommends), and we’ll be offering our favorite…
Nastja’s Nutritious and Delicious Homemade Shchi
Hi, Nastja here! I’m going to share with you my shchi recipe that is:
- Cheap
- So tasty
- Super nutritious*
- Vegan
- Gluten Free
You will also need:
- A cabbage (I use sweetheart, but any white cabbage will do)
- 1 cup (250g) red lentils (other kinds of lentils will work too)
- ½ lb or so (250–300g) tomatoes (I use baby plum tomatoes, but any kind will do)
- ½ lb or so (250–300g) mushrooms (the edible kind)
- An onion (I use a brown onion; any kind will do)
- Salt, pepper, rosemary, thyme, parsley, cumin
- Marmite or similar yeast extract (do you hate it? Me too. Trust me, it’ll be fine, you’ll love it. Omit if you’re a coward.)
- A little oil for sautéing (I use sunflower, but canola is fine, as is soy oil. Do not use olive oil or coconut oil, because the taste is too strong and the flashpoint too low)
First, what the French call mise-en-place, the prep work:
- Chop the cabbage into small strips, ⅛–¼ inch x 1 inch is a good guideline, but you can’t really go wrong unless you go to extremes
- Chop the tomatoes. If you’re using baby plum tomatoes (or cherry tomatoes), cut them in half. If using larger tomatoes, cut them into eighths (halve them, halve the halves, then halve the quarters)
- Chop the mushrooms. If using button mushrooms, half them. If using larger mushrooms, quarter them.
- Chop the onion finely.
- Gather the following kitchenware: A big pan (stock pot or similar), a sauté pan (a big wok or frying pan will do), a small frying pan (here a wok will not do), and a saucepan (a rice cook will also do)
Now, for actual cooking:
- Cook the red lentils until soft (I use a rice cooker, but a saucepan is fine) and set aside
- Sauté the cabbage, put it in the big pot (not yet on the heat!)
- Fry the mushrooms, put them in the big pot (still not yet on the heat!)
When you’ve done this a few times and/or if you’re feeling confident, you can do the above simultaneously to save time
- Blend the lentils into the water you cooked them in, and then add to the big pot.
- Turn the heat on low, and if necessary, add more water to make it into a rich soup
- Add the seasonings to taste, except the parsley. Go easy on the cumin, be generous with the rosemary and thyme, let your heart guide you with the salt and pepper.
- When it comes to the yeast extract: add about one teaspoon and stir it into the pot. Even if you don’t like Marmite, it barely changes the flavour (makes it slightly richer) and adds a healthy dose of vitamin B12.
We did not forget the tomatoes and the onion:
- Caramelize the onion (keep an eye on the big pot) and set it aside
- Fry the tomatoes and add them to the big pot
Last but definitely not least:
- Serve!
- The caramelized onion is a garnish, so put a little on top of each bowl of shchi
- The parsley is also a garnish, just add a little
Any shchi you don’t eat today will keep in the fridge for several days, or in the freezer for much longer.
*That nutritious goodness I talked about? Check it out:
- Lentils are high in protein and iron
- Cabbage is high in vitamin C and calcium
- Mushrooms are high in magnesium
- Tomatoes are good against inflammation
- Black pepper has a host of health benefits
- Yeast extract contains vitamin B12
Let us know how it went! We love to receive emails from our subscribers!
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Can kimchi really help you lose weight? Hold your pickle. The evidence isn’t looking great
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Fermented foods have become popular in recent years, partly due to their perceived health benefits.
For instance, there is some evidence eating or drinking fermented foods can improve blood glucose control in people with diabetes. They can lower blood lipid (fats) levels and blood pressure in people with diabetes or obesity. Fermented foods can also improve diarrhoea symptoms.
But can they help you lose weight, as a recent study suggests? Let’s look at the evidence.
Remind me, what are fermented foods?
Fermented foods are ones prepared when microbes (bacteria and/or yeast) ferment (or digest) food components to form new foods. Examples include yoghurt, cheese, kefir, kombucha, wine, beer, sauerkraut and kimchi.
As a result of fermentation, the food becomes acidic, extending its shelf life (food-spoilage microbes are less likely to grow under these conditions). This makes fermentation one of the earliest forms of food processing.
Fermentation also leads to new nutrients being made. Beneficial microbes (probiotics) digest nutrients and components in the food to produce new bioactive components (postbiotics). These postbiotics are thought to contribute to the health benefits of the fermented foods, alongside the health benefits of the bacteria themselves.
What does the evidence say?
A study published last week has provided some preliminary evidence eating kimchi – the popular Korean fermented food – is associated with a lower risk of obesity in some instances. But there were mixed results.
The South Korean study involved 115,726 men and women aged 40-69 who reported how much kimchi they’d eaten over the previous year. The study was funded by the World Institute of Kimchi, which specialises in researching the country’s national dish.
Eating one to three servings of any type of kimchi a day was associated with a lower risk of obesity in men.
Men who ate more than three serves a day of cabbage kimchi (baechu) were less likely to have obesity and abdominal obesity (excess fat deposits around their middle). And women who ate two to three serves a day of baechu were less likely to have obesity and abdominal obesity.
Eating more radish kimchi (kkakdugi) was associated with less abdominal obesity in both men and women.
However, people who ate five or more serves of any type of kimchi weighed more, had a larger waist sizes and were more likely to be obese.
The study had limitations. The authors acknowledged the questionnaire they used may make it difficult to say exactly how much kimchi people actually ate.
The study also relied on people to report past eating habits. This may make it hard for them to accurately recall what they ate.
This study design can also only tell us if something is linked (kimchi and obesity), not if one thing causes another (if kimchi causes weight loss). So it is important to look at experimental studies where researchers make changes to people’s diets then look at the results.
How about evidence from experimental trials?
There have been several experimental studies looking at how much weight people lose after eating various types of fermented foods. Other studies looked at markers or measures of appetite, but not weight loss.
One study showed the stomach of men who drank 1.4 litres of fermented milk during a meal took longer to empty (compared to those who drank the same quantity of whole milk). This is related to feeling fuller for longer, potentially having less appetite for more food.
Another study showed drinking 200 millilitres of kefir (a small glass) reduced participants’ appetite after the meal, but only when the meal contained quickly-digested foods likely to make blood glucose levels rise rapidly. This study did not measure changes in weight.
Kefir, a fermented milk drink, reduced people’s appetite.
Ildi Papp/ShutterstockAnother study looked at Indonesian young women with obesity. Eating tempeh (a fermented soybean product) led to changes in an appetite hormone. But this did not impact their appetite or whether they felt full. Weight was not measured in this study.
A study in South Korea asked people to eat about 70g a day of chungkookjang (fermented soybean). There were improvements in some measures of obesity, including percentage body fat, lean body mass, waist-to-hip ratio and waist circumference in women. However there were no changes in weight for men or women.
A systematic review of all studies that looked at the impact of fermented foods on satiety (feeling full) showed no effect.
What should I do?
The evidence so far is very weak to support or recommend fermented foods for weight loss. These experimental studies have been short in length, and many did not report weight changes.
To date, most of the studies have used different fermented foods, so it is difficult to generalise across them all.
Nevertheless, fermented foods are still useful as part of a healthy, varied and balanced diet, particularly if you enjoy them. They are rich in healthy bacteria, and nutrients.
Are there downsides?
Some fermented foods, such as kimchi and sauerkraut, have added salt. The latest kimchi study said the average amount of kimchi South Koreans eat provides about 490mg of salt a day. For an Australian, this would represent about 50% of the suggested dietary target for optimal health.
Eating too much salt increases your risk of high blood pressure, heart disease and stroke.
Evangeline Mantzioris, Program Director of Nutrition and Food Sciences, Accredited Practising Dietitian, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Once-A-Week Strategy to Stop Procrastination – by Brad Meir
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Procrastination is perhaps the most frustrating bad habit to kick!
We know we should do the things. We know why we should do the things. We want to do the things. We’re afraid of what will happen if we don’t do the things. And then we… don’t do the things? What is going on?!
Brad Meir has answers, and—what a relief—solutions. But enough about him, because first he wants to focus a little on you:
Why do you procrastinate? No, you’re probably not “just lazy”, and he’ll guide you through figuring out what it is that makes you procrastinate. There’s an exploration of various emotions here, as well as working out: what type of procrastinator are you?
Then, per what you figured out with his guidance, exercises, and tests, it’s time for an action plan.
But, importantly: one you can actually do, because it won’t fall foul of the problems you’ve been encountering so far. The exact mechanism you’ll use may vary a bit based on you, but some tools here are good for everyone—as well as an outline of the mistakes you could easily make, and how to avoid falling into those traps. And, last but very definitely not least, his “once a week plan”, per the title.
All in all, a highly recommendable and potentially life-changing book.
Grab Your Copy of “Once-A-Week Strategy to Stop Procrastination” NOW (don’t put it off!)
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Why You Can’t Deep Squat (And the Benefits You’re Missing)
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Matt Hsu fought his own battle with chronic pain from the age of 16 in his feet, knees, hips, back, shoulders, elbows, forearms, wrists, hands, and head. Seeking answers, he’s spent a career in corrective exercise, posture alignment, structural integration, orthopedic exercise, sports medicine, and has more certifications than we care to list. In short, he knows his stuff.
Yes you can (with some work)
The deep squat, also called Asian squat, Slav squat, sitting squat, resting squat, primal squat, and various other names, is an important way of sitting that has implications for a lot of aspects of health.
Why it’s so important: it preserves the mobility of our hips, ankles, and everything in between, and maintaining especially the hip mobility makes a big difference not only to general health, but also to reducing the risk of injury. It also maintains lower body strength, making falls in older age less likely in the first place, and if falls do happen, makes injury less likely, and if injury does happen, makes the injury likely less severe.
An important misconception: there is a popular, but unfounded, belief that the ability or inability to do this is decided by genes—or if not outright decided, that at the very least Asians and Slavs have a genetic advantage. However, this is simply not true. Westerners and others can learn to do it just fine, and on the flipside, Asians and Slavs who grew up in the West may often struggle with it. The truth is, the deciding factor is lifestyle: if your culture involves sitting this way more often, you’ll be able to do it more comfortably and easily than if you’re just now trying it for the first time.
Factors that you can control: you can’t change where you grew up, but you can change how you sit down now. Achieving the squat requires repeated position practice, and the more frequently you do so (even if you just start with a few seconds and work your way up to longer periods), the better you’ll get at it. And, on the contrary, sitting in chairs weakens and shortens the muscles involved, so any time you spend sitting in chairs is working against you. There are many reasons it’s advisable to avoid sitting in chairs more than necessary, and this is one of them.
10almonds tip: a limiting factor for many people initially is ankle flexibility, which may result in one’s center of gravity being a bit far back, leading to a tendency to have to change something to avoid toppling over backwards. Rather than holding onto something immobile (e.g. furniture) in front of where you are sitting, consider simply holding an object in front of you in your hands. A book is a fine example; holding that in front of you (feel free to read the book) will shift your center of gravity forwards a bit, and will thus allow you to sit there a little longer, thus improving your strength and flexibility while you do, until you can do it without holding something in front of you. If you try with a book and you’re still prone to toppling backwards, try with something heavier, but do use the minimum weight necessary, because ultimately the counterbalance is just a crutch to get you to where you need to be.
For more visual advice on how to do it, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
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