Answer:
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
What contains zero calories, but if you consume it, you will probably gain weight?
Pregnant every time you see her, yet she never will give birth.
Sometimes black, sometimes white, I have veins but no blood
If you're stealing honey, be prepared to receive vengeance in this form.
I fly to any foreign parts assisted by my spreading wings. My body holds an hundred hearts Nay I will tell you stranger things when I am not in haste I ride and then I mend my pace anon.