‘Drink more water’ is one of the most repeated pieces of health advice there is, and also one of the least actionable. More than what? By when? Most people already know water is good for them; what they don't have is a specific behavior to actually do.
There's a more specific, testable version of that advice, and it's not about your daily total at all — it's about timing. In controlled trials, drinking 500 mL of water (roughly two glasses) before a meal cut calorie intake at that meal by 13 to 22%, without anyone being told to eat less.
The likely mechanism is straightforward: water takes up physical space in the stomach and contributes to a feeling of fullness, so a pre-meal glass (or two) shows up as reduced intake once food arrives. Drinking the same amount of water at some other point in the day — say, mid-afternoon, disconnected from a meal — doesn't produce the same effect, because the "space in the stomach right before eating" mechanism isn't in play anymore. The timing is doing the work, not the total volume.
This is also why "just drink more water generally" style advice tends to underperform in practice: it's true but untethered from a specific moment, so it's easy to follow loosely and get none of the benefit that comes from a precise a habit like drinking a set amount right before a meal.
OriginLeap's water target is written the same way the research is: a set amount, dosed before meals, not just an abstract daily total to hit whenever. That specificity is deliberate — it's the version of "drink water" that the actual trials tested, so it's the version worth building a habit around.
It also plays well with the app's daily reset rule. A vague goal like "drink enough water today" is hard to judge as done or not done. "Water, before meals, today" is either true or it isn't — which is exactly the kind of target that holds up over 75 days instead of quietly dissolving into good intentions.
Curious what the other six habits are backed by?
See the rest of the research