cross-posted from: https://lemmy.world/post/41425995
...because the shape of the water bottle isn't uniform either. Part of my new year's resolution is to drink 4 liters of water per day, so I spend a lot of time looking at those lines. Edit: 4 liters is a lot, but appropriate for my size and activity level. Without conscious consideration I don't drink enough water. It looks blue because the bottle is blue.
Neat.
Although... Why 4 L of water? There has been a persistent gym-trainer recommendation for folk to drink the whole recommended daily allowance of water as a distinct supplement, even though most other foods and drink supply adequate hydration on their own.
Water is great as a snack-alternative for caloric reduction, however, not to mention it's use in thermal regulation. My understanding is just that they "you're dehydrated unless your pee is clear" folks are operating outside the mean of medical advice.
The marks on the.bottle are definitely interesting, though.