Most major dietary guidelines around the world, including those from the Health Promotion Board in Singapore, recommend eating fish at least twice a week. This is not an arbitrary number — it is the frequency at which the nutritional benefits of fish, particularly omega-3 fatty acids, begin to show meaningful effects in population-level health outcomes. For families in Singapore where fish already appears regularly in the diet, the goal is often less about adding it and more about ensuring the right species and preparation methods are used consistently.
Two servings per week delivers a meaningful omega-3 intake for adults, contributes significantly to weekly protein needs, and provides iodine, selenium, and vitamin B12 at levels that make a genuine dietary difference. Three servings per week is better still, and for children whose brains are still developing rapidly, eating fish at most meals during the week is perfectly appropriate as long as mercury-appropriate species are chosen.
What Counts as One Serving of Fish?
A serving is typically defined as 85 to 140 grams of cooked fish for an adult — roughly the size of a standard fillet or two to three medium fish slices in a hawker bowl. For children aged one to three, a serving is smaller: 30 to 45 grams of cooked fish is sufficient. For babies from six to twelve months, a tablespoon or two of pureed or flaked fish at a meal is an appropriate portion. The goal is regular inclusion rather than large quantities at any one sitting.
Species Rotation: Why Eating the Same Fish Every Day Falls Short
Eating a wide variety of fish serves two functions: it maximises the range of nutrients received and it prevents any single source of contaminant from accumulating. A family that eats threadfin every day gets good protein and low mercury exposure but misses the high DHA of oily fish. One that eats only salmon trout gets excellent omega-3 but misses the lighter protein and different mineral profile of white fish. A rotation that cycles through three or four species in a week captures much more of what seafood has to offer.
- Monday: steamed threadfin — lean protein, mild flavour, very low mercury
- Wednesday: salmon trout or fjord trout — highest DHA, omega-3 top-up for the week
- Friday: pomfret or grouper — different texture, good B12 and iodine
- Weekend: black cod or Greenland halibut — rich, satisfying, excellent for varied cooking methods
Frequency by Life Stage
The optimal fish-eating frequency changes with life stage. For pregnant and breastfeeding women, two to three servings of low-mercury fish per week is recommended; the DHA passes directly to the developing fetus and then to the infant through breast milk. Batang and other higher-mercury species should be limited to once a week or less during this period. For infants starting solids, fish can appear at multiple meals per day once it is well-established; there is no upper limit for low-mercury species for healthy babies eating a varied diet. For children and adults, two to three times a week is the evidence-based baseline.
Making Two to Three Servings a Week Realistic
The barrier to eating fish regularly is rarely desire; it is usually habit and planning. Singapore has exceptional seafood infrastructure — wet markets with fresh fish daily, online fishmongers with next-morning delivery — that removes most of the logistical friction. The practical pattern that works for most busy families: order at the beginning of the week with a rough plan for which nights will be fish nights; keep a portion or two of oily fish (frozen salmon trout or black cod) in the freezer as a fallback; and lean on simple preparations — steaming with ginger and soy, clear fish soups, broths over rice — that take under thirty minutes on a weeknight.
Is There Such a Thing as Too Much Fish?
For low-mercury species, there is effectively no upper limit that a normal diet would approach. No reasonable family cooking at home will steam so much threadfin that mercury becomes a concern. The only species where frequency genuinely matters for young children and pregnant women is batang, and even there, once a week is well within safe limits. For adults without pregnancy, eating fish at every meal of the week, cycling through a variety of species, carries no documented risk and considerable benefit. The recommendation of two to three times a week is a floor, not a ceiling.