Some call it one of the most powerful plant foods on the planet. Flaxseed or linseed (Linum usitatissimum L.) comes from the flax plant, an annual herb. Although flaxseed contains all sorts of healthy components, it owes its healthy reputation primarily to three ingredients :Omega-3 essential fatty acids, Lignans, Fiber. One tablespoon of ground flax seed, approximately seven grams, contains 37 calories. This single serving also has slightly over 1g of protein, 2g of carbohydrate and just under 3g of fat. Most of the carbohydrate content is made up of fiber, which is 1.9g by weight.