... I'm just going to go over my usual intake as a person trying to lose a little weight, but mostly maintain under the circumstances of "brain eats everything." I'll also note that I'm a vegetarian, I guess.
I get up between 6 and 8 most mornings when I'm at school.
Breakfast: some kind of fruity grainy nutty vegetably thing. Usually I'll have a cup of tea, a banana, and one of the following--rice pudding, leftovers, a vat of pad thai, a bowl of nuts, or a fried egg with onions cooked in. I'll also eat half a cucumber or something. For those who care, I make the pad thai with two eggs per half-package of noodles, and a 3"x3"x5" block of cut up tofu, along with maybe half a cup of peanuts to sprinkle on top.
Second breakfast: Either the rest of first breakfast, in the case where I made something like an entire wok-ful of pad thai, or something similar. Second breakfast and first breakfast are usually two different things from the same list.
Lunch: This is usually pretty late in the afternoon, when I've just remembered that I actually have to eat. I'll have a peanut butter and jelly sandwich while I'm working on dinner. More tea with a little milk and sugar.
Snack: An apple or a banana. Probably another little handful of raw vegetables, like carrots or something. Maybe half a head of lettuce.
First dinner: dinner. Sometimes this will be half of a candied squash (just a squash gutted and smeared with a little olive oil, salt, and honey, then baked for a while) or something. Maybe it will be a big bowl of squash curry steeped in coconut milk (which has stuff in it that keeps your arteries from hardening, by the way, despite the large amounts of fat). Spaghetti. In any case, something high on carbohydrates and probably also fat.
Second/accidental dinner: this happens when I get hungry again and realize that there's leftovers in the fridge. I'll eat the other half of what might usually be a light dinner for three people, mostly by accident.
I usually go to bed a bit hungry between midnight and 1.
If I was adding more calories to this, I'd swap out all of the skim milk for whole milk and keep a bag of almonds or something on hand. Seriously, I've eaten an entire 3,000-calorie bag of almonds in one evening (along with some other stuff) and didn't gain weight. Another option is swapping out eggs or nuts for light meat in some places.
As far as vitamin supplements:
Fish oil pills (have to take these daily to keep my brain working and my personality stable)
Women's multivitamin (for iron, since anemia can be a real problem)
Emergen-C vitamin C packages (only when I'm coming down with a cold, as I basically don't eat oranges or tangerines anymore due to massive overeating in my youth. I used to eat ten tangerines a day)
Hope this helps a bit?