Flaxseeds are a great source of dietary fiber; minerals like manganese, thiamine and magnesium; and plant-based protein. Flax is one of the richest sources of plant-based omega-3 fatty acids, called alpha-linolenic acid (or ALA), in the world. Grinding flax helps you absorb both types of fiber it contains.Flaxseed are the No. 1 source of lignans in the human diets; flaxseed contain about seven times as many lignans as the closest runner-up, sesame seeds. Once eaten, mucilage from flaxseeds can keep food in the stomach from emptying too quickly into the small intestine, which can increase nutrient absorption and make you feel fuller.
Because the fiber found in flaxseed is not able to be broken down in the digestive tract, some of the calories that flax contains won't even be absorbed.