When To Choose Oil-Packed Vs Water-Packed Canned Tuna - Tasting Table
Briefly

In terms of nutritional differences between canned tuna in water versus oil, water-packed tuna retains more of its omega-3s, while oil-packed tuna has higher levels of selenium and vitamin D.
Opt for oil-packed canned tuna when you're not altering it much and basically having it as is. Reach for the water-packed variety when you're planning on heavily dressing up the tuna with other ingredients.
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