Food

According to Wikipedia: 'Food is any substance, usually composed primarily of carbohydrates, fats, water and/or proteins, that can be eaten or drunk by an animal or human being for nutrition or pleasure.'

For the Sims it's a lot easier. No food = low hunger = starvation = death.

Food in The Sims
The Sims featured only a few types of food. From the fridge Sims can prepare Steak and Beans (for breakfast, lunch and dinner), and a quick salad, which takes less time but with a lesser hunger score. Sims can also order pizza over the phone to satisfy their hunger.

Later Expansion Packs provided more food for Sims to eat, including a birthday cake, cookies, turkey, smoothies, ice cream, and shrimp to name a few. But the most significant upgrade was that of Makin' Magic, which provided an oven which allows Sims to cook more types of food, as long as the required ingredients in the Sim's inventory.

Food in The Sims 2
Food in The Sims 2 is more complicated, featuring a lot of new choices, like Mac and Cheese, Lobster Thermidor and Baked Alaska. Food is even classified into three: Snacks, Meals and Dessert, with Meals also classified into three, Breakfast, Lunch and Dinner.

Modded Food
Modded food (Modified food) is food downloaded from sites like The Sims Resource and ModTheSims2. These sites have a dedicated "food" section, where you can download things several types of food like ice cream, Chinese chicken and French bread. Earlier versions of food for The Sims 2 have had many problems which creators tried to overcome, like food not disappearing, among other things.