Oily fish delivers EPA and DHA, vitamin D, astaxanthin and CoQ10 in one fillet — the single most efficient whole food on this list.

Salmon is the most efficient whole food on this list. Oily fish is the primary dietary source of the long-chain omega-3s EPA and DHA, and eating it regularly is the practical way to get them — reviews of DHA's role in health go back decades (Pharmacological Research, 1999), and research relating fish consumption to omega-3 status in the blood (American Journal of Kidney Diseases, 2006) points the same way.
Salmon is also one of the few real food sources of vitamin D: a meta-analysis of randomized trials found that increasing fish intake improved vitamin D status (American Journal of Clinical Nutrition, 2015). The yogurt sauce adds cultured dairy, where the blood-pressure literature is smaller and less settled — a randomized trial of a multi-strain fermented milk in healthy adults looked mainly at the gut microbiome (Scientific Reports, 2020).
The salmon is the reason for the dish; everything else is built to let you cook it without salt. Greek yogurt gives the sauce enough body and tang to stand in for something richer, dill supplies the herbal note people associate with salted, cured fish, and lemon juice and zest do most of the seasoning work. A few chopped capers add a small, controlled hit of salinity, which is a better use of sodium than salting the fillet. The green beans blister in the same pan and keep the plate from needing anything else. Spooning the sauce alongside rather than over keeps the skin crisp.

Aim for two or three oily-fish meals a week, which is the pattern most dietary guidance points to — frozen fillets and tinned fish count, and both cost far less than fresh. Pat the salmon completely dry before it hits the pan, since surface water is what stops the skin crisping, and pull it while the center is still slightly translucent. Make the yogurt sauce first so the dill has time to soften into it.
Calculated for one serving from USDA FoodData Central values for the ingredients above. An estimate, not a lab analysis.
How this was calculated. Each ingredient was converted to grams, matched to a food in USDA FoodData Central (SR Legacy, April 2018), summed, and divided by 2 servings. Cooking losses, draining and the real size of a handful all move these numbers, so treat them as a good estimate rather than a measurement. Added sugars count honey, maple syrup and table sugar only; sugar from whole fruit is not an added sugar.
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Primary sources for the claims above. Effects reported in these papers describe the compound or the dietary pattern studied — not this specific dish.
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