Butter is a non-perishable food item that is found in the kitchen in many houses. Butter can satiate a good deal of hunger, but it gives off unhappiness as a penalty. Butter is best used as a ingredient of a larger meal, where the unhappiness modifier would not apply.
It's Nutritional Values are as follows:
Carbohydrates = 0
Proteins = 0
Lipids = 352
Calories = 3200