Guide · body · 3 min read
Do you actually need eight glasses of water, on a low-energy afternoon
Eight glasses is a number with no particular evidence behind it. Thirst and urine colour are better guides.
Start here
The order matters less than doing the first one tonight. Start there and come back to the rest.
Low-energy afternoons are what this was written for.
If you only do one thing from this page, do the first point below. It is first because it removes the most friction for the least effort.
What helps
Food supplies a meaningful share of your water, especially fruit and vegetables.
Pale straw-coloured urine is the simplest check. Dark yellow means drink more; completely clear means you can stop.
Your kidneys are extremely good at telling you what they need. Thirst is a reliable signal for healthy adults.
What to do when it does not work
Drinking more than you need does not improve skin, concentration or health. It mostly increases trips to the toilet.
There are real exceptions: hot weather, exercise, illness, pregnancy, and some medications. In those cases thirst lags behind need.
Tea and coffee count. The idea that they dehydrate you is largely wrong at normal intakes.
Questions people ask
Does coffee dehydrate you?
At normal intakes, no. The diuretic effect is small and does not outweigh the fluid you are taking in.
Can you drink too much water?
Yes, though it is rare. Extremely large amounts in a short time can dilute blood sodium, which is dangerous.
Written for people who want the practical version. No accounts, no tracking, no newsletter wall.
If this is not the angle you need, try Do you actually need eight glasses of water — the short version, when you are waiting for something, A morning routine that survives a bad night — where to start, when you want to finish something or How to get through the first hour without your phone — what to expect, when you want to be left alone.