What are some things to start eating when you haven't eaten for such a long time?

Yoghurt is a really good place to start - particularly drinking yoghurt. It has plenty of calcium and nutrients, and usually feels like a 'safe' food when eating is difficult. Likewise soup, which I drink from a cup if using a spoon feels too stressful or demanding. I find toast very comforting too.

Eat whatever sounds good and tastes good to you. When you haven't eaten in a long time, it is more important to get calories than it is to worry about "good" foods. It's also important to take it slowly... If we're talking about anorexic tendencies, of little to no eating for a long time, only increase your eating by 100-200 calories a day to make sure it is done safely. Don't push your body farther than feels comfortable. You might want to stick with bland foods, perhaps light foods as well. I would start with things like fruits, applesauce, things like that, maybe a little cheese or bread. Just take it slow and easy, otherwise, you may feel sick to your stomach which is the opposite of what you want!

fresh fruits and vegetables are the best things to start eating after not eating for a long time. things like watermelon, and any citrus fruits are the best to eat.

I would probably try something that is not so "heavy", and more stomach-friendly - which means, food that are low in fat, not spicy, soft, not too dry, etc. Examples can be: Yoghurt, bananas, lean meat, fish, etc. Stay healthy!

Plain foods like rice, porridge, fresh fruit and vegetables and boiled meats are good to start with. Start eating with small portions so you don't shock your system, and gradually make them bigger as you feel better.

vegetables and fruits are a great thing to start with. veg are in the category of cellulose- your body can't break it down because it's too complex, so it just goes through your system, keeping you full for a bit, and it flushes everything out of your body as it goes. (they're earths natural laxatives.) fruits are simple sugars, so your body breaks them down very quickly and uses them as quick energy, and doesn't keep many calories from them, so if it hurts your head to know you're eating, these are the best to keep you calm until you can once again eat normally.

Yoghurt is something that is really high in protein, really healthy and quite filling so that is a good place to start. Eating skim milk powder in a class of milk is also a really good snack as it fills you up and is full of healthy proteins and calcium.

For starters you should visit a doctor who can help you with this and can put you on a meal plan that will help you.

Light foods, things that aren't normally causes of heartburn. Drink lots of water, crackers, small things like that.