I can't really answer your question for you authoritatively. I'm not anything even close to a nutritionist. I take it at face value that it's important to eat vegetables & fruits... probably more-so vegetables than fruit. However, if you're concerned about the nutritional completeness of your diet, perhaps consider taking a multivitamin? Here are links to 5 articles, from PC's archives, that talk about the link between diet & mental illness in general as well as depression in particular:

Diet Plays Important Role for Mental Health

Why Your Diet Can Make or Break Depression Recovery

Can Nutrition Help Fight or Ward Off Depression?

7 Foods That May Contribute to Your Depression

10 Nutritional Deficiencies that May Cause Depression