70+% of the body is made of the most precious substance in the universe, and I would like to present to you two people. One is a busy fellow and amid such activity he forgets to eat lunch or drink water for the day, leaving him fatigued and under-fueled. The other can be seen lugging around what can only be described as an oil drum with a straw in an attempt to consume however many gallons of water per day their favorite fitness influencer just posted about. These two boys are both missing a crucial detail: the balance of water, not only in consumption but in composition.
Something miraculous happens when you bring water into the body: it gets changed before it does anything. Upon intake of plain water, the body absorbs only a little through the stomach, saving it for the intestines. From there it enters the bloodstream, mixing with plasma, and is then sent to the cells for hydration. Simple enough, right?
Something that changed the game was the discovery of the Sodium-Glucose Co-Transport (SGLT1) within the small intestine. Essentially, this means that water with the right amounts of various salts and sugar the body processes it more efficiently across the intestinal wall, increasing absorption, reducing urine loss, and improving plasma volume restoration compared to plain water (Maughan RJ & Leiper JB. “Effects of beverage composition on hydration.” Journal of Applied Physiology, 1995.). This has led to various configurations of electrolytes and sugars depending on goals.
The parts of the water have specific jobs in this reaction:
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Sodium (common salt) works within the SGLT1 system, maintains fluid balance between cells, and helps retain fluid in space outside the cell. These functions all happen outside the cells (Wright EM et al. “Biology of human sodium glucose transporters.” Physiological Reviews, 2011.).
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Potassium does work on the inside of the cell, keeping intracellular fluid balance and supporting muscle and nerve reactions (Palmer BF. “Regulation of potassium homeostasis.” Clinical Journal of the American Society of Nephrology, 2015.).
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Magnesium doesn’t directly drive water transport, but it does support cellular balancing processes including ATP (cellular energy) production and neuromuscular signaling (Gröber U et al. “Magnesium in prevention and therapy.” Nutrients, 2015.).
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Glucose (sugar) assists sodium absorption across the intestine via the SGLT1 system by enabling co-transport, increasing the efficiency of water and sodium uptake across the intestine (Binder HJ. “Oral rehydration therapy.” New England Journal of Medicine, 2010.).
In short, electrolyte beverages have been shown to improve fluid retention by 10-40% compared to plain water, depending on conditions of dehydration, exercise and heat! (Maughan RJ et al., Am J Clin Nutr, 2016.)
Why is all of this important? Why not just drink plain water the way God made it? Well, even the water that comes from the ground has some of these and other elements in it. Mineral water, sought after for its taste and sourcing from underground aquifers, and sometimes sandstone filtered, is not only delicious but begins us down the electrolyte hole, though not in the quantities that make use of the science mentioned here. I grew up on well water in Colorado, and let me tell you it was spectacular! Composition depends heavily on local geology (limestone, sandstone, volcanic rock, etc), but common mineral water concentrations do have sodium, potassium, magnesium, calcium, and bicarbonate (World Health Organization. Calcium and Magnesium in Drinking Water, 2009. Azoulay et al., J Gen Intern Med, 2001). The sodium concentration is low compared to most electrolytes and certainly sweat, but you’ll find a pure, mineral-present drink with some naturally-occurring water, even though it is not as strongly retained as electrolyte solutions designed for hydration performance (Maughan RJ et al. “Beverage Hydration Index.” American Journal of Clinical Nutrition, 2016.).
This is markedly different from the mass-produced bottled water that is so perfectly convenient. This water has been processed via reverse osmosis or distillation, removing the minerals described above, leaving near-zero mineral water. Sure, it makes clean water, but in the process you lose sodium, potassium, magnesium, calcium, and bicarbonate, which all contribute to fluid balance and retention. This water gets absorbed, but can dilute the plasma in your blood and trigger diuresis (makes you pee more) (Shirreffs SM et al. “Rehydration after exercise.” Journal of Sports Sciences, 2004.). Low-mineral water consumption has even been associated with: lower magnesium intake and potential cardiovascular implications in some populations (Azoulay et al., J Gen Intern Med, 2001). Modern bottled water is optimized for purity and shelf stability, but not for physiological function.
Now that you’re more familiar with the science of hydration, the question comes to the surface: why would you rely on plain water alone when your body uses so much more than just water to regulate your hydration levels? This is precisely why I built my electrolyte blend the way I did. I was aware that more water isn’t always the solution (see what I did there?), but the right kind makes all the difference. The even better thing is that I didn’t have to use a sugary, multicolored sports drink to do it, but was able to make a practical, work-grade hydration solution built to work with the same physiology we reviewed together.
Natural water supports survival, but when you’re working, training, and pushing your limits, you’re after performance. This is where intentional hydration starts to matter, and this is why Work-Grade Electrolytes exist. It’s a simple effective blend built to:
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Support fluid absorption and retention
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Replace key electrolytes lost through sweat (my formula has more salt than you would expect, yet it tastes almost the same as plain water)
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Avoid the colors, dyes, and heavy sugar quantities of most sports drinks, because when you’re optimizing hydration, you don’t need to process fake colors or sweeteners.
If you want a hydration solution built around this science, check out Work-Grade Electrolytes below. Yes, there are other formulas out there, so I took the liberty of comparing them to mine.
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