My understanding is that you would use MFP for this and link the 2 accounts (this is how i do it atleast) this way you can track and record consumption of calories in the MFP diary and the expended calories are synced from GC and thus measured and reported in GC (and MFP for that matter) basically think of MFP as you calorie intake tracker and GC (and your device) as the Expended tracker, linking the 2 accounts allows them to talk to each other and marry the data. you can then review and report on data within the GC platform You can also set you weight loss goal in MFP (rate of weight loss) to achieve a calorie intake per day target