Sono d'accordo con theartichoke!If I'm understanding correctly, it would make the most sense to have the two headings be "My current diet" and "My healthier diet." Presumably they both cover the period of a week, so the contrast you want to draw is "this is what I'm now eating" vs. "this is what I should be eating," no?
Yes, except that I'd change the word order of the title of the first column: "(This is) What I eat/am eating now.", "(This is) What I should eat/be eating." (either the simple or the continuous form of the verb would work, in my opinion).