Heatwave: Why Drinking Water Is Wearing You Out 💧

Hello,

When the thermometer spikes and summer settles in, the advice is everywhere: "Stay hydrated, drink water!" So you fill up your XXL water bottle, drinking it two or three times over the day, convinced you're doing your body a world of good.

Yet by mid-afternoon, the verdict is in: your legs feel heavy, fatigue sets in, and a nasty 3pm slump comes to ruin your productivity.

How is that possible when you've just drunk 2.5 liters of water? It's the thirst paradox. From a purely biological standpoint, flooding your body with plain water during a heatwave is sometimes the worst well-meaning idea. Let us explain why!

The "Water That Just Passes Through" Trap 💧

To understand, you need to look at what's happening inside your cells. Your body isn't a simple tank you just top up. For the water you drink to actually reach your tissues and muscles instead of leaking out, it needs conductors: electrolytes (essential minerals like sodium, magnesium or potassium).

The problem in summer? You sweat. And you don't just lose water, you massively lose these precious minerals. If you compensate for this loss by drinking liters of completely plain water (no minerals), you trigger a surprising phenomenon: you dilute the few electrolytes you have left.

The result? Your cells no longer have the "magnets" needed to hold onto water. It just passes straight through your digestive system. You spend your time in the bathroom, and your cells, paradoxically, stay dehydrated. That's what causes that feeling of intense fatigue and a "rinsed out" body.

Magnesium: the Great Forgotten Mineral of Summer 💎

When we talk about heat, we often think of salt (sodium). But the mineral that suffers most from this dilution is magnesium.

It's the activator of your cells: it manages energy production (ATP) and regulates the nervous system. When you dilute it by drinking too much plain water, your metabolism slows down. Heat fatigue sets in, muscles recover less well, and that heavy feeling appears.

I discover the ingredients

How to Actually Hydrate During a Heatwave ☀️

To get through heat waves with steady energy, you need to relearn how to drink "smart".

1. Stop the ice-cold water: it's the ultimate temptation, but too much ice creates a thermal shock. Your body has to spend crazy amounts of energy warming that water back up to 37° in your stomach. Go for cool or room-temperature water instead.
2. Remineralize your water: give substance to what you drink! A dash of fresh lemon juice, a pinch of unrefined sea salt, or herbal infusions bring in the first essential minerals.
3. The Onday reflex: this is exactly why we designed Onday! Our unique formula is highly concentrated in plant-based nutrients and includes an ultra-bioavailable, digestion-friendly form of magnesium. By adding your spoonfuls of Onday to your first drink of the morning, you create the perfect ground: your cells fill up on electrolytes, water is captured instantly, and your energy level stays stable until evening.

Take advantage of the summer offer before June 30

This summer, don't just "drown" yourself in water. Hydrate your cells deeply, they'll pay you back a hundredfold!

Wishing you a week full of energy and recovery, see you next Thursday!

Arthur