<p>My opinion is that because water as a weakness is commonly seen as a demon/devil weakness, hence the name Devil Fruit. And the user's soul is the polar opposite of the sea, which in turn would create a struggle between the 2. And water ultimately wins seeing as how Devil Fruits are rumored to be a part of the sea, causing its wielder to constantly be drained of their power, or in cases of sea stone, causes their power to drain just enough so that they can't use their power.</p>
<p>This is purely speculation, but it is also a very likely theory all things considered.</p>

CC BY-SA 4.0
2015-11-11T07:49:19.037Z
2023-01-22T14:54:16.643Z
2023-01-22T14:54:16.643Z
Quake Midaro
<p>Maybe it's because the Devil Fruits have some sort of origin with the Fishmen. I mean, Fishmen are already ten times stronger than a normal human, so maybe someone in the past thought that such power would be too dangerous if it fell into the hands of Fishmen. That's why those who eat it couldn't swim.</p>
<p>Maybe it started out as a feud in the past of the &quot;ancient weapons&quot;- the objects capable of destroying the world. Look at &quot;Noah&quot;, the big ship at Fishman island. Maybe it played a part in the Devil Fruits. Or maybe it's connected to the Adam Wood and Eve Tree something which Franky stated.</p>
<p>This is just a guess though.</p>

CC BY-SA 4.0
2015-06-30T12:59:38.977Z
2023-01-22T14:54:07.697Z
2023-01-22T14:54:07.697Z
Christian D. Daclan
<p>To add up to the other answer:</p>
<p>&quot;A person who has devil fruit power experiences a lack of energy when gets into the water!&quot; That means, the user lacks minimum energy to show body movements, otherwise, they could swim.
Without body movement, the person starts sinking down.</p>
<p>It's also evident that a person doesn't lose power immediately but constantly. The longer he stays in the water, the more he'll become helpless.</p>
<p>The Devil Fruit side effects section in the wiki is worth reading:</p>
<p><a href="http://onepiece.wikia.com/wiki/Devil_Fruit" rel="nofollow noreferrer">http://onepiece.wikia.com/wiki/Devil_Fruit</a></p>

CC BY-SA 4.0
2013-09-21T07:09:01.597Z
2023-01-22T14:54:11.937Z
2023-01-22T14:54:11.937Z
Rookie Programmer Aravind
<p>In my idea, I think it's because the Devil Fruits are the body of the sea devil. So, if we ate one, we can't swim because we have the power of the seas. It's like, we are stealing their powers so they will make us can't swim. That's why people who ate Devil Fruit can't swim.</p>
<p>It's the same as <em>kairoseki</em> (sea stone). <em>Kairoseki</em> is like sea ice but won't melt, and that's why Devil Fruit users can't swim.</p>

CC BY-SA 4.0
2014-03-05T09:40:41.980Z
2023-01-22T14:54:05.470Z
2023-01-22T14:54:05.470Z
Harry
<p>It is said that the Devil Fruits are the fruits of Sea Devil, so even if most of them provide a great power, they're cursed. Quoting <a href="http://onepiece.wikia.com/wiki/Devil_Fruit">One Piece's wiki</a>:</p>

<blockquote>
  <p>The sea rejects the new Devil Fruit user and they become helpless
  while submerged in water</p>
</blockquote>

<p>Also, Oda said in SBS that Devil Fruit users are vulnerable to all types of water, not just salt/sea water. Basically any type of "standing" water (ocean, lakes, rivers, etc) will affect them, while "moving" water (rain, waves, etc) won't.</p>

<p>Overall, I'm not saying the problem is the sea or something inside the users, what I'm saying is that it's <strong>both</strong>. And as to why users are affected by Seastone/Sea-Prism Stone/Kairoseki, as stated by Smoker:</p>

<blockquote>
  <p>It gives off a wavelength that is the same as the sea itself</p>
</blockquote>

<p>Basically it's a mini solid piece of the sea so that's why Devil Fruit users are affected by that as well...</p>

CC BY-SA 3.0
2013-06-06T11:16:27.130Z
Is it only when submerged in sea/salt water or also in fresh water? I mean you mention the 'Sea' devil. Secondly just touching a 'Sea prism' stone has the exact same effect which leads me to believe it's something in the users, not the sea. Maybe their bodies (involuntarily) reject the sea?
dragon112
CC BY-SA 3.0
2013-06-07T19:54:56.967Z
Is it explained why the sea rejects them, beyond a generic explanation of a curse?
kuwaly
CC BY-SA 3.0
2013-06-04T20:34:56.583Z
2013-06-06T13:42:09.713Z
2013-06-06T13:42:09.713Z
DarkAjax
<p>I've only seen bits and pieces of <em>One Piece</em>, but I know that Devil Fruit users (people who have eaten a Devil Fruit) can't swim. I never understood why, though. How does this work? It doesn't seem to give arm or leg disabilities, so what would keep them from being able to swim?</p>

<one-piece>
Why can't Devil Fruit users swim?
# Why can't Devil Fruit users swim?
Posted by: username_0 on 2013-06-04
I've only seen bits and pieces of *One Piece*, but I know that Devil Fruit users (people who have eaten a Devil Fruit) can't swim. I never understood why, though. How does this work? It doesn't seem to give arm or leg disabilities, so what would keep them from being able to swim?
**Tags:** one-piece
---
## 5 answers
### Answer by username_5 on 2013-06-04. Score: 8 | Accepted answer
It is said that the Devil Fruits are the fruits of Sea Devil, so even if most of them provide a great power, they're cursed. Quoting [One Piece's wiki](http://onepiece.wikia.com/wiki/Devil_Fruit):

> The sea rejects the new Devil Fruit user and they become helpless
> while submerged in water

Also, Oda said in SBS that Devil Fruit users are vulnerable to all types of water, not just salt/sea water. Basically any type of "standing" water (ocean, lakes, rivers, etc) will affect them, while "moving" water (rain, waves, etc) won't.

Overall, I'm not saying the problem is the sea or something inside the users, what I'm saying is that it's **both**. And as to why users are affected by Seastone/Sea-Prism Stone/Kairoseki, as stated by Smoker:

> It gives off a wavelength that is the same as the sea itself

Basically it's a mini solid piece of the sea so that's why Devil Fruit users are affected by that as well...
> **Comments:**
> **username_6** (2013-06-06): Is it only when submerged in sea/salt water or also in fresh water? I mean you mention the 'Sea' devil. Secondly just touching a 'Sea prism' stone has the exact same effect which leads me to believe it's something in the users, not the sea. Maybe their bodies (involuntarily) reject the sea?  
> **username_0** (2013-06-07): Is it explained why the sea rejects them, beyond a generic explanation of a curse?  
---
### Answer by username_1 on 2015-11-11. Score: 0
My opinion is that because water as a weakness is commonly seen as a demon/devil weakness, hence the name Devil Fruit. And the user's soul is the polar opposite of the sea, which in turn would create a struggle between the 2. And water ultimately wins seeing as how Devil Fruits are rumored to be a part of the sea, causing its wielder to constantly be drained of their power, or in cases of sea stone, causes their power to drain just enough so that they can't use their power.

This is purely speculation, but it is also a very likely theory all things considered.
---
### Answer by username_2 on 2015-06-30. Score: 0
Maybe it's because the Devil Fruits have some sort of origin with the Fishmen. I mean, Fishmen are already ten times stronger than a normal human, so maybe someone in the past thought that such power would be too dangerous if it fell into the hands of Fishmen. That's why those who eat it couldn't swim.

Maybe it started out as a feud in the past of the "ancient weapons"- the objects capable of destroying the world. Look at "Noah", the big ship at Fishman island. Maybe it played a part in the Devil Fruits. Or maybe it's connected to the Adam Wood and Eve Tree something which Franky stated.

This is just a guess though.
---
### Answer by username_3 on 2013-09-21. Score: 0
To add up to the other answer:

"A person who has devil fruit power experiences a lack of energy when gets into the water!" That means, the user lacks minimum energy to show body movements, otherwise, they could swim.
Without body movement, the person starts sinking down.

It's also evident that a person doesn't lose power immediately but constantly. The longer he stays in the water, the more he'll become helpless.

The Devil Fruit side effects section in the wiki is worth reading:

<http://onepiece.wikia.com/wiki/Devil_Fruit>
---
### Answer by username_4 on 2014-03-05. Score: 0
In my idea, I think it's because the Devil Fruits are the body of the sea devil. So, if we ate one, we can't swim because we have the power of the seas. It's like, we are stealing their powers so they will make us can't swim. That's why people who ate Devil Fruit can't swim.

It's the same as *kairoseki* (sea stone). *Kairoseki* is like sea ice but won't melt, and that's why Devil Fruit users can't swim.
---
