I weigh daily at the same time every morning and have been using an app called Happy Scale. It evens out the variations to make a trend line, which I love! It's also very cute looking :) I personally like to know how what I'm doing or eating in a day affects my weight and now that I've been doing it a while I know what is water weight and what is actual weight. It keeps me accountable and I think I'd be more neurotic if I didn't know. Do what works for you, and don't worry about what everyone is saying! And, don't be afraid to try different things, even things that may not have worked before as you're always changing.
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