What a Seaweed Salad Nutrition Label Can Tell You

Prepared salad is different from a plain seaweed entry

A restaurant side dish or refrigerated tub labeled seaweed salad is a recipe. For example, Markwell Foods’ Seasoned Seaweed Salad specification lists seaweed alongside sweeteners, sesame oil, vinegar, sesame seeds and other ingredients. Those additions are part of the food being eaten.

Dried seaweed, rehydrated plain seaweed and a dressed salad therefore need separate entries in any nutrition comparison. Water changes the weight, while dressing can add energy and sodium. A number for 100 grams of dried seaweed should not be attached to a wet prepared salad.

• Understand how water and preparation affect calorie density

Two published examples show why the serving must stay visible

The following figures come from Markwell Foods’ published New Zealand product specification and UC San Diego Dining’s prepared-salad entry, accessed on November 4, 2026. They describe those specific preparations. Markwell’s document is dated 2022; use a current package if buying that product, since formulations can change.

Make a fair comparison before interpreting the numbers

The second serving is smaller, so the two displayed sodium values do not directly rank the recipes at equal weight. For the Markwell example, the same specification supplies a 100-gram column: 272 kJ, about 65 kcal, and 780 milligrams of sodium. That is an explicit source comparison basis rather than an assumed restaurant scoop.

Kilojoules and kilocalories measure the same kind of food energy in different units. The approximate conversions here divide kJ by 4.184. Keep the unit beside the number: 136 kJ is not 136 Calories.

• Convert between Calories, kcal and kilojoules

Ingredients and allergens need their own reading

Markwell’s specification identifies soy and sesame allergens, while its precautionary statement lists possible traces of several other allergens. The UC San Diego recipe also includes sesame ingredients. Neither example establishes the ingredients in every seaweed salad sold elsewhere.

A green appearance or a vegetable ingredient does not answer whether a dressing includes soy, sesame or gluten-containing components. Read the finished product’s ingredient and allergen information. When buying an unpackaged salad, the relevant information is the preparation actually served, including its dressing.

Iodine cannot be calculated from the name alone

The NIH Office of Dietary Supplements describes wide variation in seaweed iodine content. Species and other factors matter. A generic iodine value for kelp, wakame or dried seaweed cannot establish the amount in a particular dressed salad with an unknown seaweed quantity.

Neither nutrition example above supplies a measured iodine value. The correct conclusion is that this information is unavailable from those panels, not that iodine is absent or that the dish delivers a specific amount. Do not convert a food description into an iodine dose.

Record the serving you are actually comparing

For a packaged product, note the stated grams and the number of servings in the container. For a dining-hall or restaurant entry, check whether the serving describes a side portion, a weight or a whole container. A heaped takeout tub need not match the published portion.

The useful comparison keeps the recipe, quantity and date together. It can then answer concrete questions about calories, sugars and sodium while leaving unmeasured nutrients clearly unmeasured.