💧 Why plain water is giving you headaches (and how salt is the solution)

Do you suffer from constant headaches or migraines? It might surprise you to know that a large percentage of these episodes are due to dehydration. But beware: not from a lack of water, but a lack of electrolytes. Drinking liters and liters of plain water could actually be making your problem worse. Here is why.

🌊 The ocean we carry inside (and the secret of hospitals) To understand this, we have to travel millions of years into the past. Life began in the sea; our original environment was completely salty. When we evolved and left the ocean, we couldn’t leave that sea behind… so we took it inside us.

Inside your body, there is no such thing as “plain water.” Your fluids are basically water with salt and minerals (sodium, potassium, magnesium). Think about this: when you arrive at a hospital dehydrated or in the ER, they never inject plain water into your veins. What they give you is a physiological saline solution. And what is that IV fluid? It’s water with sodium, ranging from 9 to 12 grams of salt per liter. If doctors were to put plain water directly into your bloodstream, you would literally die, because the osmotic shock would destroy your cells.

To keep this internal ocean from losing its balance, we have our kidneys, the master organs in charge of perfectly balancing water and electrolytes.

⚡ The spark of life, the role of Sodium, and what salt to use Why are electrolytes so important? Just as their name implies, they transmit electricity, which is vital for our entire metabolism and nervous system.

• If you have low electrolytes: Your electrical conductivity drops, and it takes your body much more effort to perform all its processes.
• If you have enough salt: You have good conductivity, and your energy flows.

The king of this conductivity is sodium, which makes up over 90% of the electrolytes outside our cells. A quick fact: regular table salt is simply a compound of chloride and sodium. And here is a key point: although options like sea salt, Himalayan salt, or Celtic salt are excellent because they keep other minerals intact, regular iodized table salt is perfectly fine and will be enough. In the end, the main problem is the lack of electrolytes, and since sodium is the main protagonist (90%), the normal salt in your kitchen gets the job done.

🧠 Why your head aches: The danger of plain water What happens when you drink too much plain water? Through a process called osmosis, that mineral-free water seeks balance and enters your cells, causing them to swell.

Imagine this in your brain: the cells fill with water and expand, but your skull is rigid, it doesn’t yield, and they have nowhere to grow. That increase in pressure translates into an unbearable headache or migraine.

⚖️ The WHO myth and the perfect balance With the basics clear, let’s talk about the ideal balance for our body: 4 to 5 grams of salt per liter of water. The World Health Organization (WHO) sets a general limit of 5 grams of salt per day. But, physiologically speaking, this is a mistake because it assumes we are all the same.

Not everyone drinks the same amount of water, nor do they have the same physical activity, nor do they live in the same region with the same climate. We all lose and need fluids in completely different magnitudes. Diluting 5 grams in 1 liter is not the same as diluting it in 4 liters!

For example, imagine an athlete who loses a ton of electrolytes while training. They are told to “drink water,” and they chug 4 liters of plain water, capping their salt intake at 5 grams for the whole day. Of course that’s not enough sodium! They are going to get dehydrated. If you are going to drink 3 liters of water, your body would need close to 15 grams of salt to maintain that balance.

✨ Beyond your head: Better sleep and factors that steal your salt Having good sodium levels doesn’t just turn off migraines; it transforms how your whole body works. Plus, there are everyday factors that are depleting your salt without you noticing:

• Sleeping through the night: This happens a lot to athletes (and people in general) who drink too much plain water. Without sodium, your kidneys detect an excess of useless fluid and refuse to retain it. The result is that you wake up constantly during the night to go to the bathroom. With the right salt, your body retains the necessary fluid, and you achieve deep, uninterrupted sleep.
• The fake afternoon “slump” (Brain Fog): Many people experience fatigue, brain fog, or sugar cravings mid-afternoon and think they need a coffee or sugar. Often, it’s just your brain screaming for electrical conductivity (salt).
• Clean diets and fasting: If you watch what you eat, do intermittent fasting, or eat a low-carb diet, this is vital. When insulin drops, your kidneys flush out sodium very fast. The “cleaner” and more unprocessed your diet is, the more salt you need to add to your water.
• The vicious cycle of stress: When we are highly stressed, our adrenal glands work on overdrive and consume massive amounts of sodium. And here comes the worst part: having low conductivity makes it hard for your body to function, which stresses it out even more, leading you to lose even more salt. You get trapped in a negative loop.
• Goodbye cramps and better digestion: Your muscles need that electricity to avoid spasms, and your stomach uses the chlorides from salt to produce gastric acid.

🛠️ Put it to the test today (The exact recipe) The next time you feel a headache coming on, test it out: drink a glass of water with its respective portion of salt. You will see how in 10 or 15 minutes the pain begins to lose its grip and the relief kicks in. Not only that, you will notice the difference in your body almost immediately.

🌅 Extra tip for your mornings: If we start the day right after waking up with this homemade “serum”, our blood will have better volume. To achieve this, the recipe is simple: add 1 teaspoon (about 4-5 grams) of salt to your liter of water (you can add a splash of lemon to taste). This will help us kickstart the morning with much more strength and mental clarity, especially if we start the day working out!

References & Scientific Evidence

1. Title: Exercise-Associated Hyponatremia

• Description: This clinical document details the pathophysiology of drinking excess plain water without replacing sodium. It medically explains the process of osmosis where free water shifts into cells, causing cerebral edema (brain swelling), which directly translates to severe headaches, confusion, and cranial pressure.
• URL: https://www.ncbi.nlm.nih.gov/books/NBK572128/

2. Title: A sympathetic view of the sympathetic nervous system and human blood pressure regulation

• Description: This scientific study explores how severe sodium restriction and lack of electrolytes activate the sympathetic nervous system (responsible for the “fight or flight” and stress response). It backs up the claim that low salt intake stresses the body, spikes adrenaline, and can disrupt deep sleep patterns.
• URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC3433836/

3. Title: Water and Electrolytes – Recommended Dietary Allowances

• Description: A detailed chapter on the actual requirements for water and electrolytes. It discusses how sodium and fluid needs are not universal and vary drastically depending on physical activity, solute load, sweating, and individual metabolic rates, debunking the idea that a single metric (like the WHO’s 5 grams limit) works for everyone.
• URL: https://www.ncbi.nlm.nih.gov/books/NBK234935/