Coffee has that thing about it: everyone has an opinion.
Sometimes two.
Sometimes very strong ones.
Some say it dehydrates.
Others say it flushes magnesium out of your body.
Someone heard it raises blood pressure, and someone else insists that real coffee can only be made by a barista in a café — preferably with a beard and tattoos.
At JAVA, we hear all of this regularly. That’s why today we’re taking a closer look at five of the most common coffee myths and checking how things really are. No scaring. No moralizing. No “we know better.”
Myth 1: Coffee dehydrates
This myth comes back like a boomerang. Most often paired with the phrase:
“I drink coffee, but then I have to make up for it with water.”
So how is it really?
Yes, coffee has a mild diuretic effect. But it does not dehydrate the body in a way that would have a real impact on health — especially if you drink coffee regularly.
In short:
- coffee is largely… water
- the bodies of people who drink coffee daily are accustomed to it
- your overall fluid balance still adds up.
So you can enjoy your coffee without feeling like you’ve just done something against biology.
Myth 2: Coffee flushes magnesium out of your body
This is one of those myths that sounds very “health-related,” which makes it easy to believe.
What’s the reality?
Coffee contains small amounts of magnesium. And drinking it in moderation does not cause magnesium loss in any way that would matter within a normal, balanced diet.
If you eat normally and drink coffee without excess — coffee is not the culprit behind deficiencies.
Myth 3: Coffee causes high blood pressure
We hear this myth especially often from people who… have been drinking coffee for years.
What’s the reality?
In people who drink coffee regularly, coffee has not been shown to cause high blood pressure.
There may be a short-term increase in blood pressure, but:
– it’s temporary
– it’s not pathological
– the body quickly returns to normal
In other words: no, coffee alone does not turn anyone into a cardiology patient.
Read also: Is coffee healthy?
Myth 4: All coffee contains the same amount of caffeine
“Coffee is coffee” — we hear that a lot.
But… not quite.
What’s the reality?
Caffeine content depends on several factors:
- the botanical variety of the bean
- the roast level
- the brewing method.
That’s why one coffee can really wake you up, while another is simply a pleasant ritual. And that’s perfectly normal.
Learn more about how long caffeine lasts in our comprehensive guide to how coffee works.
Myth 5: Only a café barista can make great coffee
Ten years ago, that might have been believable. Seriously.
What about today?
Today we have:
- good home grinders
- reliable home filter coffee machines
- simple, repeatable brewing methods
The result? You can make café-quality coffee at home. The difference comes down to the beans, freshness, and basic knowledge — not the café address.
How we look at this at JAVA
At JAVA, we work with coffee every day. We talk to people, drink coffee with our customers, listen to their questions and doubts. And we know one thing:
coffee myths don’t come from ignorance. They come from oversimplification.
That’s why our goal isn’t to “fix” anyone or lecture them. It’s about taking unnecessary pressure off coffee.
Good coffee doesn’t have to:
- be stressful
- require expert-level knowledge
- fit someone else’s definition of “correct”.
It just has to taste good.
Good coffee is a human right.
And knowledge about coffee shouldn’t be harder than the coffee itself.
