Most children (and adults) consume too much fat. This is mainly because so many types of food, especially most "fast foods" and conveniance contain so much fat. Fats are an essential part of children's diet so they should not be avoided completely. However, you should get your required fats from the food you eat as fats are contained in many food types.
For example fats are contained in dairy products, meats, peanut butter, eggs etc.
As a guide (taken from Healthinsite) the healthy range of daily fat intakes are:
A large portion of fries can contain 40g of fat! A burger and large fries from a well known burger chain, contains 67g of fat!
Fast foods that have relatively lower fat contents include:
Fats also take longer to digest, so a meal containing a lot of fats (including meals cooked in fats) will take longer to digest and is not recommended before physical activity.