From this Medscape article Oily Fish Eaten Once a Week Associated With Lower Rates of HF, but no Benefits of More Frequent Intake:
“A new observational study in Sweden has found that eating oily fish once a week seems to protect middle-aged and older men against developing heart failure. But eating it more often than that did not give a greater benefit; in fact, it returned the risk to the same level seen in those who never ate oily fish.”
While this does not comport with official recommendations of eating oily fish twice a week the authors of the study stated:
“Although they did not see a benefit of eating oily fish twice a week in this particular study, "I think the totality of the evidence is better captured by the official recommendations."
And this:
“Two other studies on this subject have been published since her study was accepted for publication. One, performed in the US, found no association at all between fish consumption and development of heart failure, she said. "But they were not able to separate out the type of fish people were eating; [most of it] was probably fried fish sandwiches." The second study, from Japan, did suggest that fish intake was associated with reduced heart-failure mortality, she noted.
The bottom line is this study is another indication that a moderate intake of oily fish is probably helpful for cardiovascular health."
There is a wide disparity of Omega-3 essential fatty acids. Foods High in DHA and EPA (Omega-3 Essential Fatty Acids) Food Grams in 100-gram serving Grams in normal-sized serving
Sardine oil...................................20.79...................2.83 (1 tablespoon)
Cod liver oil.................................17.87....................2.43 (1 tablespoon)
Herring oil....................................10.48..................1.43 (1 tablespoon)
Salmon, Atlantic (farmed)*........2.15....................3.89 (half fillet)
Mackerel, Pacific and jack*........1.85....................3.25 (1 fillet)
Pickled herring.............................1.39................... .42 (2 pieces)
Salmon, Chinook*.........................1.74................... 2.68 (half fillet)
Salmon, pink*...............................1.28...................1.6 (half fillet)
Mackerel, Atlantic*......................1.20...................1.07 (1 fillet)
Rainbow trout (farmed)*.............1.15................... .82 (1 fillet)
Bluefish*......................................... .99....................1.16 (1 fillet)
Sardines, canned in oil.................. .98................... .90 (1 can, 92 grams)
White tuna, canned in water....... .86................. .73 (3 ounces, 85 grams)*Cooked with dry heat
Source: National Agriculture Library, U.S. Dept. of Agriculture
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