How healthy is a diet composed almost exclusively of tuna, chicken, bread and eggs ?

My answer to How healthy is a diet composed almost exclusively of tuna, chicken, bread and eggs ?

Answer by Connie b. Dellobuono:

Eggs are complete protein and has good fat. Tuna is rich in omega 3. Some vitamin B complex are in your diet. But enzymes from papaya and pineapple are missing. And potent anti-aging nutrients from berries, walnut and grapes.

How healthy is a diet composed almost exclusively of tuna, chicken, bread and eggs ?