Canned sardines are one of those foods that seem almost too convenient to be true. They are affordable, easy to store, quick to prepare, and naturally provide protein and omega-3 fatty acids.

But before you open another can, there are a few things worth knowing.

The problem isn’t necessarily sardines themselves. In many cases, the bigger issue is which product you choose and how you consume it.

Here are five common mistakes that can make canned sardines a less healthy choice.

1. Assuming Every Can Is the Same

Not all canned sardines are created equal.

Different brands can vary considerably in the type of fish used, the preservation liquid, sodium content, and overall quality.

When choosing a can, pay attention to the ingredient list and nutrition label. Also check the appearance of the product once opened.

An unusual smell, strongly metallic taste, or sardines that are excessively mushy may be signs that the product isn’t at its best.

2. Eating the Sardines Without Draining Them

One simple habit can make a difference: drain the liquid before eating.

Depending on the product, the liquid may contain a considerable amount of sodium or oil. If you’re trying to control your salt or calorie intake, consuming every drop can add more than you realize.