when a person lives alone, the most suitable food should be simple, easy to cook, nutritious and delicious. Here are some suggestions:

1. Simply roast vegetables: cut vegetables into small pieces, add olive oil, salt and black pepper, and bake in the oven. This is a simple and nutritious food, which can be eaten with rice or bread.

2. Boiling soup: Boiling soup is a simple and nutritious food. You can make soup with all kinds of vegetables, meat and beans, and eat it with rice or bread.

3. Fried egg: Fried egg is a simple and nutritious food. Can be served with bread or toast.

4. Salad: Salad is a simple and nutritious food. Salads can be made with all kinds of vegetables, fruits and nuts and served with sauces.

5. Boiled noodles: Boiled noodles are a simple and nutritious food. You can make noodle soup with all kinds of vegetables and meat, or use sauce with noodles.

in short, when a person lives alone, the most suitable food should be simple, easy to cook, nutritious and delicious.