Serotonin vs Dopamine (Know The Differences)
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Of the various neurotransmitters that people confuse with each other, serotonin and dopamine are the two highest on the list (with oxytocin coming third as people often attribute its effects to serotonin). But, for all they are both “happiness molecules”, serotonin and dopamine are quite different, and are even opposites in some ways:
More than just happiness
Let’s break it down:
Similarities:
- Both are neurotransmitters, neuromodulators, and monoamines.
- Both impact cognition, mood, energy, behavior, memory, and learning.
- Both influence social behavior, though in different ways.
Differences (settle in; there are many):
- Chemical structure:
- Dopamine: catecholamine (derived from phenylalanine and tyrosine)
- Serotonin: indoleamine (derived from tryptophan)
- Derivatives:
- Dopamine → noradrenaline and adrenaline (stress and alertness)
- Serotonin → melatonin (sleep and circadian rhythm)
- Effects on mental state:
- Dopamine: drives action, motivation, and impulsivity.
- Serotonin: promotes calmness, behavioral inhibition, and cooperation.
- Role in memory and learning:
- Dopamine: key in attention and working memory
- Serotonin: crucial for hippocampus activation and long-term memory
Symptoms of imbalance:
- Low dopamine:
- Loss of motivation, focus, emotion, and activity
- Linked to Parkinson’s disease and ADHD
- Low serotonin:
- Sadness, irritability, poor sleep, and digestive issues
- Linked to PTSD, anxiety, and OCD
- High dopamine:
- Excessive drive, impulsivity, addictions, psychosis
- High serotonin:
- Nervousness, nausea, and in extreme cases, serotonin syndrome (which can be fatal)
Brain networks:
- Dopamine: four pathways controlling movement, attention, executive function, and hormones.
- Serotonin: widely distributed across the cortex, partially overlapping with dopamine systems.
Speed of production:
- Dopamine: can spike and deplete quickly; fatigues faster with overuse.
- Serotonin: more stable, releasing steadily over longer periods.
Illustrative examples:
- Coffee boosts dopamine but loses its effect with repeated use.
- Sunlight helps maintain serotonin levels over time.
If you remember nothing else, remember this:
- Dopamine: action, motivation, and alertness.
- Serotonin: contentment, happiness, and calmness.
For more on all of the above, enjoy:
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Ketogenic Diet: Burning Fat Or Burning Out?
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In Wednesday’s newsletter, we asked you for your opinion of the keto diet, and got the above-depicted, below-described set of responses:
- About 45% said “It has its benefits, but they don’t outweigh the risks”
- About 31% said “It is a good, evidence-based way to lose weight, be energized, and live healthily”
- About 24% said “It is a woeful fad diet and a fast-track to ruining one’s overall health”
So what does the science say?
First, what is the ketogenic diet?
There are two different stories here:
- Per science, it’s a medical diet designed to help treat refractory epilepsy in children.
- Per popular lore, it’s an energizing weight loss diet for Instagrammers and YouTubers.
Can it be both? The answer is: yes, but with some serious caveats, which we’ll cover over the course of today’s feature.
The ketogenic diet works by forcing the body to burn fat for energy: True or False?
True! This is why it helps for children with refractory epilepsy. By starving the body (including the brain) of glucose, the liver must convert fat into fatty acids and ketones, which latter the brain (and indeed the rest of the body) can now use for energy instead of glucose, thus avoiding one of the the main triggers of refractory epilepsy in children.
See: The Ketogenic Diet: One Decade Later | Pediatrics
Even the pediatric epilepsy studies, however, conclude it does have unwanted side effects, such as kidney stones, constipation, high cholesterol, and acidosis:
Source: Dietary Therapies for Epilepsy
The ketogenic diet is good for weight loss: True or False?
True! Insofar as it does cause weight loss, often rapidly. Of course, so do diarrhea and vomiting, but these are not usually held to be healthy methods of weight loss. As for keto, a team of researchers recently concluded:
❝As obesity rates in the populace keep rising, dietary fads such as the ketogenic diet are gaining traction.
Although they could help with weight loss, this study had a notable observation of severe hypercholesterolemia and increased risk of atherosclerotic cardiovascular disease among the ketogenic diet participants.❞
~ Dr. Shadan Khdher et al.
On which note…
The ketogenic diet is bad for the heart: True or False?
True! As Dr. Joanna Popiolek-Kalisz concluded recently:
❝In terms of cardiovascular mortality, the low-carb pattern is more beneficial than very low-carbohydrate (including the ketogenic diet). There is still scarce evidence comparing ketogenic to the Mediterranean diet.
Other safety concerns in cardiovascular patients such as adverse events related to ketosis, fat-free mass loss, or potential pharmacological interactions should be also taken into consideration in future research.❞
~ Dr. Joanna Popiolek-Kalisz
Read in full: Ketogenic diet and cardiovascular risk: state of the art review
The ketogenic diet is good for short-term weight loss, but not long-term maintenance: True or False?
True! Again, insofar as it works in the short term. It’s not the healthiest way to lose weight and we don’t recommend it, but it did does indeed precipitate short-term weight loss. Those benefits are not typically observed for longer than a short time, though, as the above-linked paper mentions:
❝The ketogenic diet does not fulfill the criteria of a healthy diet. It presents the potential for rapid short-term reduction of body mass, triglycerides level, Hb1Ac, and blood pressure.
Its efficacy for weight loss and the above-mentioned metabolic changes is not significant in long-term observations.❞
~ Ibid.
The ketogenic diet is a good, evidence-based way to lose weight, be energized, and live healthily: True or False?
False, simply, as you may have gathered from the above, but we’ve barely scratched the surface in terms of the risks.
That said, as mentioned, it will induce short-term weight loss, and as for being energized, typically there is a slump-spike-slump in energy:
- At first, the body is running out of glucose, and so naturally feels weak and tired.
- Next, the body enters ketosis, and so feels energized and enlivened ← this is the part where the popular enthusiastic reviews come from
- Then, the body starts experiencing all the longer-term problems associated with lacking carbohydrates and having an overabundance of fat, so becomes gradually more sick and tired.
Because of this, the signs of symptoms of being in ketosis (aside from: measurably increased ketones in blood, breath, and urine) are listed as:
- Bad breath
- Weight loss
- Appetite loss
- Increased focus and energy
- Increased fatigue and irritability
- Digestive issues
- Insomnia
The slump-spike-slump we mentioned is the reason for the seemingly contradictory symptoms of increased energy and increased fatigue—you get one and then the other.
Here’s a small but illustrative study, made clearer by its participants being a demographic whose energy levels are most strongly affected by dietary factors:
The ketogenic diet is a woeful fad diet and a fast-track to ruining one’s overall health: True or False?
True, subjectively in the first part, as it’s a little harsher than we usually go for in tone, though it has been called a fad diet in scientific literature. The latter part (ruining one’s overall health) is observably true.
One major problem is incidental-but-serious, which is that a low-carb diet is typically a de facto low-fiber diet, which is naturally bad for the gut and heart.
Other things are more specific to the keto diet, such as the problems with the kidneys:
However, kidney stones aren’t the worst of the problems:
Is Losing Weight Worth Losing Your Kidney: Keto Diet Resulting in Renal Failure
We’re running out of space and the risks associated with the keto diet are many, but for example even in the short term, it already increases osteoporosis risk:
❝Markers of bone modeling/remodeling were impaired after short-term low-carbohydrate high-fat diet, and only one marker of resorption recovered after acute carbohydrate restoration❞
~ Dr. Ida Heikura et al.
A Short-Term Ketogenic Diet Impairs Markers of Bone Health in Response to Exercise
Want a healthier diet?
We recommend the Mediterranean diet.
See also: Four Ways To Upgrade The Mediterranean
(the above is about keeping to the Mediterranean diet, while tweaking one’s choices within it for a specific extra health focus such as an anti-inflammatory upgrade, a heart-healthy upgrade, a gut-healthy upgrade, and a brain-healthy upgrade)
Enjoy!
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Why We Get Fat: And What to Do About It – by Gary Taubes
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We’ve previously reviewed Taubes’ “The Case Against Sugar“. What does this one bring differently?
Mostly, it’s a different focus. Unsurprisingly, Taubes’ underlying argument is the same: sugar is the biggest dietary health hazard we face. However, this book looks at it specifically through the lens of weight loss, or avoiding weight gain.
Taubes argues for low-carb in general; he doesn’t frame it specifically as the ketogenic diet here, but that is what he is advocating. However, he also acknowledges that not all carbs are created equal, and looks at several categories that are relatively better or worse for our insulin response, and thus, fat management.
If the book has a fault it’s that it does argue a bit too much for eating large quantities of meat, based on Weston Price’s outdated and poorly-conducted research. However, if one chooses to disregard that, the arguments for a low-carb diet for weight management remain strong.
Bottom line: if you’d like to cut some fat without eating less (or exercising more), this book offers a good, well-explained guide for doing so.
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ADHD medication – can you take it long term? What are the risks and do benefits continue?
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Attention deficit hyperactivity disorder (ADHD) is a condition that can affect all stages of life. Medication is not the only treatment, but it is often the treatment that can make the most obvious difference to a person who has difficulties focusing attention, sitting still or not acting on impulse.
But what happens once you’ve found the medication that works for you or your child? Do you just keep taking it forever? Here’s what to consider.
What are ADHD medications?
The mainstay of medication for ADHD is stimulants. These include methylphenidate (with brand names Ritalin, Concerta) and dexamfetamine. There is also lisdexamfetamine (branded Vyvanse), a “prodrug” of dexamfetamine (it has a protein molecule attached, which is removed in the body to release dexamfetamine).
There are also non-stimulants, in particular atomoxetine and guanfacine, which are used less often but can also be highly effective. Non-stimulants can be prescribed by GPs but this may not always be covered by the Pharmaceutical Benefits Scheme and could cost more.
How stimulants work
Some stimulants prescribed for ADHD are “short acting”. This means the effect comes on after around 20 minutes and lasts around four hours.
Longer-acting stimulants give a longer-lasting effect, usually by releasing medication more slowly. The choice between the two will be guided by whether the person wants to take medication once a day or prefers to target the medication effect to specific times or tasks.
For the stimulants (with the possible exception of lisdexamfetamine) there is very little carry-over effect to the next day. This means the symptoms of ADHD may be very obvious until the first dose of the morning takes effect.
One of the main aims of treatment is the person with ADHD should live their best life and achieve their goals. In young children it is the parents who have to consider the risks and benefits on behalf of the child. As children mature, their role in decision making increases.
What about side effects?
The most consistent side effects of the stimulants are they suppress appetite, resulting in weight loss. In children this is associated with temporary slowing of the growth rate and perhaps a slight delay in pubertal development. They can also increase the heart rate and may cause a rise in blood pressure. Stimulants often cause insomnia.
These changes are largely reversible on stopping medication. However, there is concern the small rises in blood pressure could accelerate the rate of heart disease, so people who take medication over a number of years might have heart attacks or strokes slightly sooner than would have happened otherwise.
This does not mean older adults should not have their ADHD treated. Rather, they should be aware of the potential risks so they can make an informed decision. They should also make sure high blood pressure and attacks of chest pain are taken seriously.
Stimulants can be associated with stomach ache or headache. These effects may lessen over time or with a reduction in dose. While there have been reports about stimulants being misused by students, research on the risks of long-term prescription stimulant dependence is lacking.
Will medication be needed long term?
Although ADHD can affect a person’s functioning at all stages of their life, most people stop medication within the first two years.
People may stop taking it because they don’t like the way it makes them feel, or don’t like taking medication at all. Their short period on medication may have helped them develop a better understanding of themselves and how best to manage their ADHD.
In teenagers the medication may lose its effectiveness as they outgrow their dose and so they stop taking it. But this should be differentiated from tolerance, when the dose becomes less effective and there are only temporary improvements with dose increases.
Tolerance may be managed by taking short breaks from medication, switching from one stimulant to another or using a non-stimulant.
Medication is usually prescribed by a specialist but rules differ around Australia.
Ground Picture/ShutterstockToo many prescriptions?
ADHD is becoming increasingly recognised, with more people – 2–5% of adults and 5–10% of children – being diagnosed. In Australia stimulants are highly regulated and mainly prescribed by specialists (paediatricians or psychiatrists), though this differs from state to state. As case loads grow for this lifelong diagnosis, there just aren’t enough specialists to fit everyone in.
In November, a Senate inquiry report into ADHD assessment and support services highlighted the desperation experienced by people seeking treatment.
There have already been changes to the legislation in New South Wales that may lead to more GPs being able to treat ADHD. Further training could help GPs feel more confident to manage ADHD. This could be in a shared-care arrangement or independent management of ADHD by GPs like a model being piloted at Nepean Blue Mountains Local Health District, with GPs training within an ADHD clinic (where I am a specialist clinician).
Not every person with ADHD will need or want to take medication. However, it should be more easily available for those who could find it helpful.
Alison Poulton, Senior Lecturer, Brain Mind Centre Nepean, University of Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Protein Immune Support Salad
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How to get enough protein from a salad, without adding meat? Cashews and chickpeas have you more than covered! Along with the leafy greens and an impressive array of minor ingredients full of healthy phytochemicals, this one’s good for your muscles, bones, skin, immune health, and more.
You will need
- 1½ cups raw cashews (if allergic, omit; the chickpeas and coconut will still carry the dish for protein and healthy fats)
- 2 cans (2x 14oz) chickpeas, drained
- 1½ lbs baby spinach leaves
- 2 large onions, finely chopped
- 3 oz goji berries
- ½ bulb garlic, finely chopped
- 2 tbsp dessicated coconut
- 1 tbsp dried cumin
- 1 tbsp nutritional yeast
- 2 tsp chili flakes
- 1 tsp black pepper, coarse ground
- ½ tsp MSG, or 1 tsp low-sodium salt
- Extra virgin olive oil, for cooking
Method
(we suggest you read everything at least once before doing anything)
1) Heat a little oil in a pan; add the onions and cook for about 3 minutes.
2) Add the garlic and cook for a further 2 minutes.
3) Add the spinach, and cook until it wilts.
4) Add the remaining ingredients except the coconut, and cook for another three minutes.
5) Heat another pan (dry); add the coconut and toast for 1–2 minutes, until lightly golden. Add it to the main pan.
6) Serve hot as a main, or an attention-grabbing side:
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Cashew Nuts vs Coconut – Which is Healthier?
- What Matters Most For Your Heart?
- Beyond Supplements: The Real Immune-Boosters!
- Goji Berries: Which Benefits Do They Really Have?
- Our Top 5 Spices: How Much Is Enough For Benefits?
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Are Supplements Worth Taking?
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small 😎
❝There seems to be a lot of suggestions to take supplements for every thing, from your head to your toes. I know it’s up to the individual but what are the facts or stats to support taking them versus not?❞
Short answer:
- supplementary vitamins and minerals are probably neither needed nor beneficial for most (more on this later) people, with the exception of vitamin D which most people over a certain age need unless they are white and getting a lot of sun.
- other kinds of supplement can be very beneficial or useless, depending on what they are, of course, and also your own personal physiology.
With regard to vitamins and minerals, in most cases they should be covered by a healthy balanced diet, and the bioavailability is usually better from food anyway (bearing in mind, we say vitamin such-and-such, or name an elemental mineral, but there are usually multiple, often many, forms of each—and supplements will usually use whatever is cheapest to produce and most chemically stable).
However! It is also quite common for food to be grown in whatever way is cheapest and produces the greatest visible yield, rather than for micronutrient coverage.
This goes for most if not all plants, and it goes extra for animals (because of the greater costs and inefficiencies involved in rearing animals).
We wrote about this a while back in a mythbusting edition of 10almonds, covering:
- Food is less nutritious now than it used to be: True or False?
- Supplements aren’t absorbed properly and thus are a waste of money: True or False?
- We can get everything we need from our diet: True or False?
You can read the answers and explanations, and see the science that we presented, here:
Do We Need Supplements, And Do They Work?
You may be wondering: what was that about “most (more on this later) people”?
Sometimes someone will have a nutrient deficiency that can’t be easily remedied with diet. Often this occurs when their body:
- has trouble absorbing that nutrient, or
- does something inconvenient with it that makes a lot of it unusable when it gets it.
…which is why calcium, iron, vitamin B12, and vitamin D are quite common supplements to get prescribed by doctors after a certain age.
Still, it’s best to try getting things from one’s diet first all of all, of course.
Things we can’t (reasonably) get from food
This is another category entirely. There are many supplements that are convenient forms of things readily found in a lot of food, such as vitamins and minerals, or phytochemicals like quercetin, fisetin, and lycopene (to name just a few of very many).
Then there are things not readily found in food, or at least, not in food that’s readily available in supermarkets.
For example, if you go to your local supermarket and ask where the mimosa is, they’ll try to sell you a cocktail mix instead of the roots, bark, or leaves of a tropical tree. It is also unlikely they’ll stock lion’s mane mushroom, or reishi.
If perchance you do get the chance to acquire fresh lion’s mane mushroom, by the way, give it a try! It’s delicious shallow-fried in a little olive oil with black pepper and garlic.
In short, this last category, the things most of us can’t reasonably get from food without going far out of our way, are the kind of thing whereby supplements actually can be helpful.
And yet, still, not every supplement has evidence to support the claims made by its sellers, so it’s good to do your research beforehand. We do that on Mondays, with our “Research Review Monday” editions, of which you can find in our searchable research review archive ← we also review some drugs that can’t be classified as supplements, but mostly, it’s supplements.
Take care!
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Before You Eat Breakfast: 3 Surprising Facts About Intermittent Fasting
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Dr. William Li is well-known for his advocacy of “eating to beat disease”, and/but today he has advice for us about not eating to beat disease. In moderation, of course, thus: intermittent fasting.
The easy way
Dr. Li explains the benefits of intermittent fasting; how it improves the metabolism and gives the body a chance to do much-needed maintainance, including burning off any excess fat we had hanging around.
However, rather than calling for us to do anything unduly Spartan, he points out that it’s already very natural for us to fast while sleeping, so we only need to add a couple of hours before and after sleeping (assuming an 8 hour sleep), to make it to a 12-hour fast for close to zero effort and probably no discomfort.
And yes, he argues that a 12-hour fast is beneficial, and even if 16 hours would be better, we do not need to beat ourselves up about getting to 16; what is more important is sustainability of the practice.
Dr. Li advocates for flexibility in fasting, and that it should be done by what manner is easiest, rather than trying to stick to something religiously (of course, if you do fast for religious reasons, that is another matter, and/but beyond the scope of this today).
For more information on each of these, as well as examples and tips, enjoy:
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Want to learn more?
You might also like to read:
- Intermittent Fasting: What’s the truth?
- 16/8 Intermittent Fasting For Beginners
- Meal Timings & Health: How Important Is Breakfast?
Take care!
Don’t Forget…
Did you arrive here from our newsletter? Don’t forget to return to the email to continue learning!
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