Flax is rich in fat, protein and dietary fiber. An analysis of brown Canadian flax averaged 41% fat, 20% protein, 28% total dietary fiber, 7.7% moisture and 3.4% ash, which is the mineral-rich residue left after samples are burned. The composition of flax can vary with genetics, growing environment, seed processing and method of analysis. The protein content of the seed decreases as the oil content increases. The oil content of flax can be altered through traditional plant breeding methods, and it is affected by geography- the cool nights of northern Canada improve oil content and quality.

Diane H. Morris, PhD
Flax A Health and Nutrition Primer