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Weight loss is NOT...I repeat, NOT...linear. It cannot be predicted, and your body is going to lose weight in it's own time, even if you do everything "right" and stay perfectly on plan.
Print this out and pin it up on your bathroom mirror. Read it every day.
Unfortunately our bodies are not machines. It would be really really nice if it was just the mathematical equation of calories in and calories out. But there are so many other variables.
Your age can affect your metabolism which means you burn calories more slowly.
How much sodium you consume can cause you to retain water.
Your blood sugar levels can affect your weight loss.
Your time of month can affect your weight loss.
Whether there's still food or product in your digestive system can affect your weight loss.
And .. aside from all of that, your body does get used to what you're giving it/doing with it, especially when you put yourself in a deficit. The body's instinctive response is to AVOID STARVING. So if you put your body in a deficit for a long time, your body will start to change it's own metabolism to more effectively use what you're giving it and not lose weight. It's that biological imperative to survive. It's one of the things that causes stalls and it's one of the reasons that people will tell you to continually mix up your exercise routine and not do the same exact thing every day. Keep your body guessing.
And ... on top of all of that, keep in mind that calorie calculation is not 100% exact. No one can say you're burning exactly 100 calories or eating exactly 100 calories or whatever. You have to figure that in every calculation, BMR, calories burned, calories consumed, etc. there's a margin of +/- 10% or so. And 10% doesn't sound like much but over a period of time it can make a difference.
So ... like Mandalinn said ... don't try to predict too much long term. But don't focus on too short term either. It's not instantaneous. It's a life journey, not a sprint to the finish line.
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