What is the healthier option?
(We went straight to a food-tech pro for this answer.)
Pre-ground flaxseed has been exposed to oxygen longer; oxygen causes polyunsaturated fats to break down.
(So do heat and light.)
Tell-tale sign that this has occurred: an off smell and/or flavor you might call “rancid.”
Best bet: Buy whole.
Grind only what you need.
