Tuna Is Also Very Low In Calories, Making It An Ideal Food For Those Looking To Maintain A Healthy Weight While Keeping Up Their Energy Levels. Contains Omega 3 Fatty Acids. Tuna Is Especially Abundant In Omega 3 Fatty Acids. They’re Brilliant For The Body And Are Thought To Help Lower Cholesterol, Boost Brain Function And Improve Eye Health. It’s An Excellent Source Of Vitamin B12. Tuna Is Rich In Vitamin B12, A Form Of B Vitamin Responsible For Helping The Body Form New Red Blood Cells. The Benefits Of Fresh And Canned Tuna Are Typically The Same. However, Fresh Tuna Is Thought To Contain Slightly More Protein. Nevertheless, Tinned Tuna Is More Affordable And Lasts Much Longer3.