Disclaimer: This article is for informational purposes only and is not medical advice. Please consult with your health care professional with any medical or health related questions.
Caffeine has a whole heap of benefits – from keeping you awake during an afternoon slump to enhancing sports performance, even controlling ADHD!
The effects of caffeine on one’s mental state are an important area for scientists to explore because about 90 percent of the world’s adults take the stimulating substance. Some prefer coffee, some tea, others soda pop and a few more take it in energy drinks. Caffeine is also in chocolate, over-the-counter pain relievers and even caffeine mints, including Viter Energy Mints.
But the health and wellness communities have long debated the pros and cons of caffeine, with the latter touching on its effects on mental health. Some studies show that caffeine can help alleviate symptoms of depression, while others say it worsens the condition.
Scientists debate whether caffeine has a positive or negative effect on people suffering from depression, a disorder affecting 15 percent of people in high-income nations. 
Some scientists say caffeine helps alleviate symptoms, thanks to its positive effects that are so great it may actually help prevent suicide. There are numerous studies that have shown caffeine – specifically coffee - may prevent mild to moderate depression:
This means that caffeine, particularly in coffee, may lessen the likelihood of depression.
By the way, this same study also found that tea, with its lower caffeine content per cup, was less protective in preventing against depression, but still effective to some extent.
While there are no studies yet on how exactly coffee actually prevents depression, the researchers from Qingdao University Medical College put forward a couple of possible explanations.
Firstly, they speculated coffee may help prevent depression because it has chemical compounds that counteract depression.  Coffee combats depression through compounds that reduce inflammation in the nerve cells in depressed people’s brains. The compounds are caffeic acid, chlorogenic acid, and ferulic acid.
They suggested in the study:
“Along with caffeine’s natural antioxidant properties, coffee can act as an anti-inflammatory in affected parts of the brain. This may relieve some of the discomfort and distress caused by depression, which is related to inflammation.”
The other hypothesis is based on the psychostimulant nature of caffeine – it boosts motivation and helps you feel more awake.
Caffeine helps the brain create more dopamine, which activates the part that taps reward perception. This then allows you to make better decisions, feel more motivated, and generally be in a happy mood.
Based on a review conducted by A. Nehlig, having 75mg of caffeine (a cup of coffee) every 4 hours can lead to a “pattern of sustained improvement of mood over the day.” It can increase alertness and well-being, help concentration, improve mood and limit depression. 
For more information on this, read How does caffeine affect your mood?
Some research has found that copious amounts of coffee and caffeine can worsen one’s mental state. Coffee and/or caffeine taken in large amounts can result in headaches, anxiety, nausea, restlessness, increased blood pressure and palpitations.
Medical News Today says these symptoms are part of the fight or flight process. If the fight or flight symptoms occur too often from caffeine, inflammation and disease could result. 
Coffee consumption may result in a heightened risk of depression, some studies have shown. One study says taking caffeine might intensify depression and result in anxiety if the person has a mood disorder.
Further, caffeine’s effects are temporary, and depressed people could experience a crash in their mood when it wears off. “People who have depression are advised against consuming large amounts of caffeine,” Medical News Today concludes.
Mayo Clinic says that while there isn’t a clear link between caffeine consumption and depression, the idea may have been based on two things: 
Caffeine does more than just wake you up. It’s the most widely used stimulant/substance/drug (however way you want to call it) for getting that familiar jolt in the morning, the kick that you need to jumpstart the day.
Every day, millions of people all around the world consume caffeine to stay awake and ease fatigue. But there’s definitely more to it than just a fix.
While it usually gets a bad rap for its adverse effects like jitters and link to depression (usually from having too much of it too soon), moderate caffeine consumption can give you the best bang for the cup.
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The afternoon slump would be OK if you could just lie down for a little nap. But most of us have to earn a living, and management would likely frown on anyone who went home from 2 to 4 p.m. for a siesta. Unless (a) you’re somewhere in Europe – where this is perfectly acceptable or (b) you have the total freedom to create your own schedule every day.
But what if an afternoon nap is out of the question? How can you cope with an urge to sleep after lunch?
This article suggests ways on how you can beat the afternoon slump.
It’s common knowledge that coffee brings a whole range of benefits, the most popular being that instant kick in the morning.
It’s not just coffee that can be habit-forming. The benefits of regular caffeine fix themselves can lead us to grab one cup of joe after another.
But what if one day you decide to take a break from your favorite cup?
What happens when you stop drinking coffee?
Here are some of the interesting things that could occur.
How many cups of coffee do you normally have in a day?
Two? Three? Four? More?
If you’ve read one of our articles “Here’s how much caffeine you can have in a day,” you will know that the sweet spot is 400 mg a day. That’s equivalent to 4 cups of brewed coffee.
This is the ultimate good news for coffee-lovers, right?
But what if you go beyond four cups of joe a day? What exactly will happen?