What is Seratonin? What foods contain it? Why is it important?
Serotonin is a chemical nerve cells produce. It sends signals between your nerve cells. Serotonin is found mostly in the digestive system, although it’s also in blood platelets and throughout the central nervous system.
Serotonin is made from the essential amino acid tryptophan. This amino acid must enter your body through your diet and is commonly found in foods such as nuts, cheese, turkey and red meat. Tryptophan deficiency can lead to lower serotonin levels. This can result in mood disorders, such as anxiety or depression.
What does serotonin do?
Serotonin impacts every part of your body, from your emotions to your motor skills. Serotonin is considered a natural mood stabilizer. It’s the chemical that helps with sleeping, eating, and digesting. Serotonin also helps:
- reduce depression
- regulate anxiety
- heal wounds
- stimulate nausea
- maintain bone health
Here’s how serotonin acts in various functions across your body:
Bowel movements: Serotonin is found primarily in the body’s stomach and intestines. It helps control your bowel movements and function.
Mood: Serotonin in the brain is thought to regulate anxiety, happiness, and mood. Low levels of the chemical have been associated with depression, and increased serotonin levels brought on by medication are thought to decrease arousal.
Nausea: Serotonin is part of the reason why you become nauseated. Production of serotonin rises to push out noxious or upsetting food more quickly in diarrhea. The chemical also increases in the blood, which stimulates the part of the brain that controls nausea.
Sleep: This chemical is responsible for stimulating the parts of the brain that control sleep and waking. Whether you sleep or wake depends on what area is stimulated and which serotonin receptor is used.
Blood clotting: Blood platelets release serotonin to help heal wounds. The serotonin causes tiny arteries to narrow, helping form blood clots.
Bone health: Serotonin plays a role in bone health. Significantly high levels of serotonin in the bones can lead to osteoporosis, which makes the bones weaker.
Sexual function: Low levels of serotonin are associated with increased libido, while increased serotonin levels are associated with reduced libido.
Serotonin and mental health
Serotonin helps regulate your mood naturally. When your serotonin levels are normal, you feel:
- happier
- calmer
- more focused
- less anxious
- more emotionally stable
A 2007 study found that people with depression often have low levels of serotonin. Serotonin deficiency has also been linked to anxiety and insomnia.
Minor disagreements about the role serotonin plays in mental health have occurred. Some researchers in older studies have questioned whether an increase or decrease in serotonin can affect depression. Newer research claims it does. For example, a 2016 animal study examined mice lacking serotonin autoreceptors that inhibited serotonin secretion. Without these autoreceptors, the mice had higher levels of serotonin available in their brains. Researchers found these mice exhibited less anxiety and depression-related behaviors.
Alcohol and anxiety » normal ranges for serotonin levels
Generally, the normal range for serotonin levels in your blood is 101–283 nanograms per milliliter (ng/mL). This benchmark, however, may differ slightly depending on the measurements and samples tested, so talk to your doctor about specific test results.
High levels of serotonin may be a sign of “carcinoid syndrome”. This involves a group of symptoms related to tumors of the:
- small intestine
- appendix
- colon
- bronchial tubes
A doctor will take a blood test to measure serotonin levels in your blood to diagnose the disease or rule it out.
How to treat serotonin deficiency
You can increase your serotonin levels through medication and more natural options.
SSRIs
Low levels of serotonin in the brain may cause depression, anxiety, and sleep trouble. Many doctors will prescribe a selective serotonin reuptake inhibitor (SSRI) to treat depression. They’re the most commonly prescribed type of antidepressant.
SSRIs increase the levels of serotonin in the brain by blocking reabsorption of the chemical, so more of it remains active. SSRIs include Prozac and Zoloft, among others.
When you’re taking serotonin drugs, you shouldn’t use other medications without first talking to your doctor. Mixing drugs may put you at risk of serotonin syndrome.
Natural serotonin boosters
Outside of SSRIs, the following factors can boost serotonin levels, according to a paper published in the Journal of Psychiatry and Neuroscience Trusted Source:
1. Eggs The protein in eggs can significantly boost your blood plasma levels of tryptophan, according to recent research. Pro cooking tip: Don’t leave out the yolks! Yolks are extremely rich in tryptophan and tyrosine, choline, biotin, omega-3 fatty acids, and other nutrients.
2. Cheese is another great source of tryptophan. A yummy favorite you could make is mac and cheese that combines cheddar cheese with eggs and milk, which are also good sources of tryptophan.
3. Pineapples are a major source of bromelain, a protein that can reduce the side effects of chemotherapy as well as help suppress coughs, according to some research.
4. Tofu (in moderation) Soy products are rich sources of tryptophan. You can substitute tofu for pretty much any protein, in pretty much any recipe, making it an excellent source of tryptophan for vegetarians and vegans.
5. Salmon It’s hard to go wrong with salmon, which — as you may have guessed — is also rich in tryptophan. Combine it with eggs and milk to make a smoked salmon frittata! Salmon also has other nutritional benefits like helping balance cholesterol, lowering blood pressure, and being a source of omega-3 fatty acids.
6. Nuts and seeds Pick and choose, because all nuts and seeds contain tryptophan. Studies show that eating a handful of nuts a day can lower your risk for cancer, heart disease, and respiratory problems. Nuts and seeds are also good sources of fiber, vitamins, and antioxidants.
7. Turkey is very high in tryptophan.
Serotonin and your diet: Does it work?
So the common belief is that by eating foods high in tryptophan, you can boost your serotonin levels. But is this true?
Serotonin isn’t found in foods, but tryptophan is. Foods high in protein, iron, riboflavin, and vitamin B-6 all tend to contain large amounts of this amino acid. While high-tryptophan foods won’t boost serotonin on their own, there’s one possible cheat to this system: carbs.
Carbs cause the body to release more insulin, which promotes amino acid absorption and leaves tryptophan in the blood. If you mix high-tryptophan foods with carbs, you might get a serotonin boost.
The tryptophan you find in food has to compete with other amino acids to be absorbed into the brain, so it’s unlikely to have much of an effect on your serotonin levels. This differs from tryptophan supplements, which contain purified tryptophan and do have an effect on serotonin levels.
While they can’t compete with supplements — which you should not be taking without approval from your doctor — the foods listed above contain high amounts of tryptophan.
Your best chance at achieving a serotonin boost without using supplements is to eat them often, with a serving of healthy carbohydrates, like rice, oatmeal, or whole-grain bread.
Other ways to boost serotonin
- Exercise. Research from the United Kingdom shows that regular exercise can have antidepressant effects.
- Sunshine. Light therapy is a common remedy for seasonal depression. Research shows a clear relationship between being exposed to bright light and serotonin levels. To get better sleep, or to boost your mood, try to work in a daily lunchtime walk outside.
- Positivity. Research shows that facing daily life and your interactions with others with a positive outlook can significantly boost your serotonin levels.: “All you need is positivity!”
- Gut bacteria. Eat a high-fiber diet to fuel healthy gut bacteria, which new research shows play a role in serotonin levels through the gut-brain axis. Supplemental probiotics may also be of value.
- Exercise: Regular exercise can have mood-boosting effects.
- A healthy diet: Some foods that can increase serotonin levels include eggs, cheese, turkey, nuts, salmon, tofu, and pineapple.
- Meditation: Meditating can help relieve stress and promote a positive outlook on life, which can greatly boost serotonin levels.