We’ve all seen the social media memes suggesting that happiness is a choice. But if you struggle with persistent low mood, you already know the truth: you can’t just “willpower” your way back to joy.
Despite what feel-gooders may tell you, a lack of happiness is not a character flaw or behavioral failure.
The reality is that your feelings are not just thoughts – driven by complex neurochemistry. When those “gray cloud” days follow you despite your best efforts to stay positive, it’s often because your brain biochemistry overrides your mindset.
Understanding the biochemistry of emotions is the first step to real relief. If you’ve ever felt like motivation and “good vibes” aren’t enough, here’s the scientific reason why your brain may be working against your best intentions.
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Neurotransmitters and neurons
In particular, you feel its ebb and flow neurotransmitters such as dopamine and serotonin, which dictate whether the world appears bright or heavy.
These chemical messengers – often referred to as “feel good hormones” – are produced by the body and directly affect different organs, including our brain.
In their role as neurotransmitters, they carry messages in the spaces between nerve cells to allow them to ‘talk’ to each other.
Our brain is basically a giant network of these nerve cells, called neurons. They do not touch each other, and there is a tiny gap between them called a synapse. A neurotransmitter’s job is to carry a signal across the gap to tell the next neuron what to do.
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Feedback loop
How well these neurotransmitters work can make a big difference in how we feel from day to day, which is affected by our hormone levels and balance.
Serotonin, produced in the brain (10%) and the gut (90%), acts as our brain’s internal mood regulator. When levels are stable, we feel calm, content and emotionally balanced. When it’s low, we can often feel anxious, irritable, or down.
Dopamine, produced in the brain and adrenal glands, it activates the reward centers in our braingiving us a boost fueling motivation and focus.
These two hormones interact and influence each other. For example, healthy serotonin levels help regulate dopamine highs and lows, preventing extreme swings.
But If serotonin levels drop, impulses caused by dopamine may be strongerwhich explains why we chase dopamine hits through compulsive social media scrolling, binge-watching series, or overeating sugary snacks when we’re feeling down.
However, when we increase dopamine after a rewarding activity, the brain adapts the receptors to prevent overload.
This is why overstimulation, like constantly checking your phone, can dull dopamine sensitivity over time. Chronic stress can also reduce dopamine production and receptor sensitivity.
Manufacture of neurotransmitters
Serotonin and dopamine are both made from amino acidsthat we get from food and supplements. Serotonin is produced from the amino acid tryptophan and is converted to 5-HTP and then to serotonin, while dopamine from tyrosine.
Therefore, healthy hormone levels start with a balanced diet. You find tryptophan in foods like eggs, salmon, nuts, seeds, and tofu. We get tyrosine from chicken, beef, dairy, beans, lentils and soy.
You can also provide your body with additional support by ensuring your body receives vitamins and minerals that act as co-factors to boost serotonin or dopamine production naturally. Without them, the process can stop.
These important vitamins and minerals include:
- Vitamin B6: Necessary for the conversion of 5-HTP to serotonin and L-DOPA to dopamine.
- Vitamin C: It is needed for the step that converts dopamine to noradrenaline.
- Magnesium: It supports the enzymes in these conversion processes and also calms the nervous system.
- Folic acid (B9) and vitamin B12: Support the methylation cycle, which affects serotonin metabolism.
- Iron: It is required for tryptophan and tyrosine hydroxylase, the enzyme that starts the serotonin pathway and converts tyrosine to L-DOPA.
- Vitamin D: Regulates tryptophan hydroxylase activity – one reason sunlight helps mood.
- Copper: It plays a role in the conversion of dopamine into noradrenaline.
- Zinc: Supports enzyme activity and receptor function.
- Omega-3: The anti-inflammatory effects of omega-3s create a more favorable environment for both serotonin and dopamine production and signaling. These fats can also improve the sensitivity of neurotransmitter receptors in brain cells.
Lifestyle factors
While we cannot directly control our emotions through sheer force of will, we can influence the neurochemical environment that produces them.
The brain, for all its complexity, responds predictably to certain inputs, such as sleep patterns, food choices, physical movement, social connection, and exposure to sunlight.
These lifestyle factors act as levers that directly affect the production and regulation of neurotransmitters.
Getting more sunlight, especially first thing in the morning, boosts serotonin by regulating our circadian rhythm (via the pineal gland, which converts serotonin to melatonin).
Stress management is also important because your body regulates the levels of these hormones through the hypothalamic-pituitary-adrenal (HPA) axis and the hypothalamic-pituitary-thyroid (HPT) axis.
Chronic stress can throw these axes out of balance, reducing serotonin signaling and resulting in mood disorder. This is where activities like meditation, mindfulness, yoga and journaling can help regulate those happy hormones.
Regular movement, especially aerobic exercise like running or cycling, releases these ‘feel good’ hormones – that’s why it’s often called “runner’s high”. This effect is associated with a drop in stress hormone levels, which helps improve mood and combat depression and stress.
The other important piece in the feel-good puzzle is getting enough quality sleep. During restorative deep sleep, serotonin receptors reset and become more sensitive, helping us feel calm and emotionally stable the next day.
Poor sleep or sleep deprivation can also desensitize dopamine receptors in the brain’s reward and attention centers, which can lead to difficulty concentrating, lower motivation, and a reduced sense of pleasure from everyday activities.
Not getting enough REM sleep can also leave us anxious and craving artificial dopamine hits like sugar, caffeine or social media.
Both bad sleep habits and bad bedtime habits mess with our circadian rhythm, which is regulated by dopamine – normally, dopamine levels rise in the morning to help us feel alert and motivated, then gradually decline in the evening so we can relax.
Creating balance
Because of their interaction, it is impossible to focus on one hormone without considering the other.
Finding the sweet spot is all about the right balance, and your daily habits, such as regular exercise, eating, sunlight, sleep, and taking care of your mental health, are powerful levers to keep that balance in check.
Author: Pedro van Gaalen
When he’s not writing about sports or health and fitness, Pedro is most likely out training for his next marathon or ultramarathon. Worked as a fitness professional and marketing and comms specialist. He now combines his passions in his role as managing editor at Fitness magazine.
