They're both real. What you weigh is what you weigh.
But think about this: When you eat a meal, what do you think happens to it? Do you think it floats on a pillow of air in your stomach and doesn't show up on the scale?
When you drink water ... do you think it just floats in your
body and doesn't show up on the scale?
The scale weighs everything. Drinking a bottle of water and then stepping on the scale is no different from holding a bottle of water in your hand when you step on the sale. Eating a meal and standing on the scale is no different than holding the plate of food in your hand when you get on the scale.
Would you put on your heaviest jeans and a winter coat and then step on the scale? Of course not. So why would you put food and water in your
body and then step on the scale?
Weigh ONCE a day, at the same time of day, having eaten or drunk the same things, and wearing the same clothes. Otherwise, you're not measuring your
body, you're measuring everything you've put in or on your
body.