Since I have become a real Fitbit Ultra fan and have it with me every day, I am of course happy about every new feature. Depending on how much exercise I have, I have a certain number of calories available (i.e. for feeding). Accordingly, daily fitbit calculates live and foods eaten are taken into account.

fitbit-personalized-calorie-20-05-2012

Until now, it was the case that you were shown in the Fitbit portal "You have eaten X calories too much, please do more exercise […]". If you do that, it fits … But if you don't compensate for the calories you eat too much, the next day you're going to continue as normal – you've got (.B) 1800 calories available again (Fitbit Food Plan).

Now not (only) the daily calories are calculated, but also the data (food, exercise, etc.) of the last days. So if I ate too much yesterday, I'm also advised to eat a calorie-reduced diet from the Fitbit Portal (to be able to balance the previous day).