Hi Suzy
That article that as posted was really great - contains lots of info about your question.
The other things that will help with depression are:
1. Exercise - study after study has shown that moderate and regular exercise will help with mild to moderate depression to the same level as medication, the only hard thing to do is to actually get up and do the exercise, which is hard if you feel even a little depressed. Just try to do it.
2. Balance of sugar levels - if your sugar levels are erratic from high intakes of high sugar foods, this will wreak havoc on your emotional stability. It is well known that not having stable and consistent sugar levels is not beneficial in many ways and can make a person feel anxious and nervous (low sugar levels), while high sugar levels can create artifical euphoria and feeling like one is "drunk". Keeping your sugar levels consistent, by eating wholesome, healthy foods, will really go a long way to ensuring your depression is not exacerbated.
Always eat breakfast - have some cereal, milk and fruit, or eggs and fruit - there are plenty of web sites which have useful ideas for breakfast lunch and dinner. Try to make sure you eat some healthy snacks in between your main meals (good snacks are some ryvita with some hommous or some low fat cheese and tomato or some nuts and fresh fruit).
3. Avoid refined sugar and foods that contain refined sugar - this is related to point 2 above - these foods contain high levels of sugar, which will make your sugar levels go too high very quickly and then drop again very quickly. This is not good for healthy individuals, but worse if you have any mental or physical afflication as it can make it worse, due to the effects of the sugar fluctuations.
4. There are some foods which actually help the body make "happy hormones" - these foods are: low fat meat (chicken / turkey especially), milk and other low fat dairy, eggs. This site from Nutrition Data, gives the foods highest in Tryptophan
Nutritional Data5. Get a regular routine going - try to do the same things at the same time - this will help you by ensuring your life is stable and consistent.
If you like, you can also check out Vital Health Zone - it has a lot of useful information about nutrition and health. I'll write some information about depression in the health part this week.
Good luck with your depression - hope this information helps