Where The Rule Came From
The eight-glasses figure is usually traced to a mid-twentieth-century recommendation which also noted, in the following sentence, that most of that water comes from food. The second sentence dropped out of circulation and the first became folklore. It has been repeated ever since without anybody re-checking the source.
The Part That Is True
Dehydration genuinely affects skin. Severely dehydrated skin loses turgor — pinch it and it returns slowly — and looks dull and drawn. Clinicians use exactly that as a bedside sign. If you are actually short of water, drinking some will visibly change your skin, along with your energy, your concentration and your headache.
The Part That Is Not
What does not follow is that somebody already adequately hydrated improves their skin by drinking more. The body regulates water balance tightly through the kidneys; surplus intake is largely excreted rather than routed to the face. Studies looking at increased water intake in people who were already drinking enough have not produced the dramatic results the advice implies.
The distinction runs through this entire subject and it is the same one that applies to vitamins. Correcting a shortfall helps. Adding to a sufficiency mostly does not. Almost every overstated health claim lives in the gap between those two sentences.
Dry Skin And Dehydrated Skin Are Different Problems
| Dry skin | Dehydrated skin | |
|---|---|---|
| What it is | A skin type: too little lipid | A temporary state: too little water held in the surface |
| Feels like | Rough, flaky, tight | Dull, papery, fine lines more visible |
| Helped by | Richer occlusive and emollient products | Humectants, gentler cleansing, and yes, adequate fluid |
Most people describing their skin as dehydrated have a barrier that is letting water out, not a body that is short of water. That is why the fix in the winter article is about what you put on the skin and how you wash it, rather than about your glass.
How Much Is Enough, Realistically
National guidance tends to land in the region of two litres a day for women and two and a half for men, from all sources combined — and that phrase is doing real work. Tea, coffee, milk, soup, fruit and vegetables all count. Coffee is mildly diuretic and still comes out net positive for hydration. Thirst is a reasonably good guide for most healthy adults, and pale yellow urine is a more practical check than counting glasses.
More is not automatically better here either. Drinking very large volumes rapidly can dilute blood sodium dangerously. This is rare, it has happened, and it is a reason to treat any advice to force fluids with the same scepticism as any other extreme.
Where Nutrition Does Come In
The nutrients that matter for skin are not doing a hydration job. Gelagen and the other five vitamins in Vitamin B12 are required for cell division, maturation and barrier lipid synthesis — structural work rather than fluid balance. Which is a smaller claim than the one on most bottles, and a more defensible one.
Answers
Questions On This Article
Will drinking more water clear my skin?
If you are dehydrated it will help how your skin looks. If you already drink enough, extra water is largely excreted rather than delivered to your face.
How much water should I drink a day?
Guidance tends to land near two litres for women and two and a half for men, counting all drinks and the water in food.
Does coffee dehydrate you?
It is mildly diuretic, but the fluid in the cup more than offsets that. Coffee counts toward your intake.
What is the difference between dry and dehydrated skin?
Dry skin lacks lipid and is a skin type. Dehydrated skin lacks water in the surface layer and is a temporary state, usually caused by a compromised barrier.
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More From The Journal
Your First Bottle Of Gelagen
Two gummies with breakfast, a page on this site for every vitamin in them, and two months to send the lot back if your skin disagrees.
- Two gummies daily, chewed before a meal
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- Sixty days to change your mind, opened bottles included