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what about in yogurt??

Whole flax seed stays fresh for up to a year if stored correctly. However, they will go rancid more quickly after being ground up into meal. For this reason, many people choose to buy whole flax seed and grind it into meal themselves (this takes seconds in a blender or coffee grinder).

If you question how long the flax meal has been on the shelves or how it has been stored, it is recommended that you purchase whole flax seed and grind it yourself. It’s also less expensive this way. Any time you taste flax meal that is at all bitter, throw it away. It should be mildly nutty tasting, and not at all harsh.

Whole flax seed should be stored in a cool, dark, dry place. Many people choose to store it in the refrigerator or freezer to be on the safe side. Flax meal should be stored in the freezer and used up within a few weeks.

Drink plenty of water. There is so much soluble fiber in flax that it is important to drink plenty of water when eating flax products, otherwise constipation may result.

Remember to start slowly if you aren’t used to a high-fiber diet.

If you purchase the whole seeds, you need to grind them up to get the benefit.

source and more tips...
http://lowcarbdiets.about.com/od/whattoeat/a/flaxinfo_2.htm