But I don't have an eating problem, I just do not feel like eating much when I am depressed.

Yep, many people go through that with depression. Days when the odd sandwich here, an odd biscuit with a coffee there, is all the food that they eat for several days. Problem is that the body is then robbed of many of the vitamins and minerals that it needs. Many of them when they are lacking will make the bad depressive days last longer, and of course, the lack of food will mean a lack of energy. Alcoholic intake is also able to do more damage to the body, and mind, at this time. Lack of roughage will also tend to cause things such as IBS and ulcers to become worse. Pain killers, if you take them, also tend to become less effective due to the fact that their absorption rates can be different when little food is eaten during the day.

I know that it can be hard to look after yourself when having a crap day, I have, and still do have, days when food is the last thing on my mind. If food becomes part of your contingency plan, for dealing with crap days, then it does make a real difference to many people. Simple things such as making sure that you have a range of easy to cook food, that you LIKE, in stock in your house seams like an obvious step to take, but is also easily overlooked. For me, frozen or tinned, sponge puddings and custard, that I can cook in a microwave quickly work well. They "pad" my digestive system out quite well, can be ready in a few mins, and my inner child likes them

I have also been known to put frozen sausage rolls, or that part cooked frozen bread, into the oven to cook. It can be surprising how the smell they give off during cooking can make the body "feel" hungry, and ready to eat.

At the end of the day it depends what works for you, and making contingency plans to get you through the rough patches. Feeling like eating little on the crap days may be usual for a lot of people, but eating little also make the bad days last a lot longer as well for most people.