Withings Pulse 02. Enable MFP negative calories

Hi Everyone!

still new to this wonderful site! Shocked to see what I eat?!? And I thought I ate well.

Also shocked at the activity tracker. Need to walk more! :)

I am a little confused about the negative calorie adjustment in MFP. Should I have it enabled or not?

Withings doesn't track food in their site or app, so it seems if I want to be honest that I need to have negative calories enabled in MFP? Is that correct?

Thanks in advance for any help!