Fat is a long chain of fatty acids that is one of the three essential nutrients(the other two are protein and carbohydrate) that provide energy to the body.
Testing of fat:
Fats can be tested by taking small amounts of food materials one by one.
Then place that food on a clean white paper and press it with a mild force.
If a greasy and translucent spot appears on that paper consider that food is rich in fats.
Thus, from the given food items, oils, butter, meat, pizza, poori and groundnuts are fat-rich food.