Fish Twice a Week — Include Oily Fish

Eat fish at least twice a week, about 3.5 ounces cooked per serving, choosing oily fish such as salmon, sardines, herring, mackerel, lake trout or albacore tuna — the target the American Heart Association and the NHS both set.

The protocol

• Target: at least 2 servings of non-fried fish per week, with one of them oily fish.
• Choose: oily fish such as salmon, sardines, herring, mackerel, lake trout or albacore tuna; bake, grill or steam rather than fry.
• Serving: about 3.5 ounces (roughly 100 g) cooked per serving per the American Heart Association; the NHS counts a portion as around 140 g.
• Watch: canned and smoked fish can be high in salt, so check the label.
• Duration: ongoing.

What you get

• The American Heart Association reports that eating fish about twice a week is linked with lower risk of heart disease and ischemic stroke (observational evidence).
• Oily fish is a food source of omega-3 fatty acids, which most people eat little of; the NHS notes oily fish is particularly rich in them.

Contraindications

• Pregnant or nursing women and young children should avoid fish with higher mercury levels such as shark, swordfish, tilefish and king mackerel.
• The NHS advises girls, women planning a pregnancy, and pregnant or breastfeeding women to keep oily fish to no more than 2 portions a week.
• Avoid fish and shellfish you are allergic to; people with a fish allergy should not follow this habit.
• Canned and smoked fish can be high in salt, which matters for anyone told to limit sodium — ask a clinician or dietitian if unsure.

Evidence level

Medium. The American Heart Association's twice-weekly fish link to lower cardiovascular and stroke risk comes from observational evidence rather than randomised trials, and the NHS gives the matching two-portion target along with the mercury and pregnancy caveats.

Sources

• American Heart Association — Eating Fish Twice a Week Reduces Heart, Stroke Risk
• American Heart Association — Are You Getting Enough Omega-3 Fatty Acids?
• NHS — Fish and Shellfish Nutrition
• American Heart Association — Fish and Omega-3 Fatty Acids

AgeGen never invents studies and never recommends prescription drugs by brand. Biohacks are experiments, not prescriptions — honour the contraindications and talk to a clinician if a condition above applies to you.