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.
Bacteria produce small-chain fatty acids (SCFAs) that attach themselves to a protein called Gp41 and it is this activity that was observed to lower blood pressure. Yogurt contains both fatty acids and bacteria and could conceivably aid blood pressure reduction in this way.