The reason it reports that. It is comparing what you logged to what you chose as your plan. Sometimes eating too little can slow or stall weight loss. Sites like fitbit and Spark often suggest a planned weekly rate of loss of 2 pounds or less per week. So this would be a 1000 calorie daily deficit assuming your current weight and activity level would allow you to undereat by 1000 calories a day while still having enough calories available to take in good nutrition.
In your case, it is telling you that you logged that you ate less than your plan. It may not be a big deal if your body can support it as it looks like a deficit similar to a 1.5 pound a week loss.
For other people, this report might show them they ate more than their plan over the week and this is also useful information when evaluating results.
I guess the things I would look at are...
*How accurate is your food tracking? Meaning are you actually weighing and/or measuring portions? I personally think weighing with a food scale is more accurate, easier and less messy especially if you have a scale that you can zero out with a plate on top (then you can put the food directly on your plate or bowl without messing with measuring spoons and cups). This also can help train you to eyeball portions later because you get use to what it looks like on your plates. I don't do this all the time, because I rebel against it eventually, but when I do it is eyeopening and a stall buster. And when I stop doing this, I naturally choose the same sized portions for a while. So it can help to commit to weighing portions for a week at a time here and there if you don't want to do it all the time.
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