Top 8 takeaway tunas tested

A canned favourite, tuna is difficult to assess health-wise. Fresh, it has plenty of healthy omega fatty acids, but cooked and canned, the processing leaves it with far less and about half the amount of vitamin D.

Still, there are other benefits such as potassium and iron, but oily fish stores mercury in its fat so keep away from it if pregnant and if not, keep consumption to a few times a week.

About 26% protein in tuna means we can expect it to sustain us until our next meal. Use tuna with olives, cooked new potatoes, anchovies, tomatoes, and hardboiled eggs for a classic Nicoise salad.