Base is used broadly in both literal and figurative contexts: the wide base of the pyramid; a party seeking to expand its power base. Basis is used in a nonphysical sense: Healthy scepticism is the basis of all accurate observation (Arthur Conan Doyle).
Omega-3 fats also lower blood pressure and heart rate, improve blood vessel function, and, at higher doses, lower triglycerides and may ease inflammation, which plays a role in the development of atherosclerosis. Several large trials have evaluated the effect of fish or fish oils on heart disease.
There are several different types of omega-6 fatty acids, and not all promote inflammation. Most omega-6 fatty acids in the diet come from vegetable oils, such as linoleic acid (LA) -- not to be confused with alpha-linolenic acid (ALA), an omega-3 fatty acid.